<div id="pf1" class="pf w0 h0" data-page-no="1"><div class="pc pc1 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="https://files.passeidireto.com/787e5e60-c8dd-44bb-8486-dd82b8ea0ca1/bg1.png"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls1 ws1">Pereira, <span class="blank _0"> </span>L.E.T. <span class="blank _0"> </span>e <span class="blank _0"> </span>Paiva, <span class="blank _0"> </span>A.J. <span class="blank _0"> </span>O <span class="blank _1"> </span>manejo <span class="blank _0"> </span>de <span class="blank _0"> </span>pastagens <span class="blank _0"> </span>e <span class="blank _1"> </span>a<span class="blank _2"> </span>s <span class="blank _1"> </span>r<span class="blank _2"> </span>elações <span class="blank _0"> </span>fonte/d<span class="blank _2"> </span>reno <span class="blank _0"> </span>na <span class="blank _1"> </span>p<span class="blank _2"> </span>lanta </div><div class="t m0 x1 h2 y2 ff1 fs0 fc0 sc0 ls1 ws1">forrageira. PU<span class="blank _2"> </span>BVET, V.2, N.22, <span class="blank _2"> </span>Art#244, <span class="blank _2"> </span>Jun1, 2008<span class="blank _2"> </span>.<span class="ff2 fs1"> </span></div><div class="t m0 x2 h3 y3 ff2 fs1 fc0 sc0 ls1 ws1"> </div><div class="t m0 x3 h2 y4 ff1 fs0 fc0 sc0 ls1 ws1"> </div><div class="t m0 x4 h4 y5 ff3 fs1 fc0 sc0 ls1 ws1">PUBVET, Publicações em Medicina Veterinária e Zootecnia. </div><div class="t m0 x5 h2 y6 ff1 fs0 fc0 sc0 ls1 ws1">Disponível em<span class="blank _2"> </span>: <http:/<span class="blank _2"> </span>/www.pubvet.<span class="blank _2"> </span>com.br/tex<span class="blank _2"> </span>to.php?id=244>.<span class="ff3"> </span></div><div class="t m0 x6 h4 y7 ff3 fs1 fc0 sc0 ls1 ws1">O manejo de pastagens e as relações fonte/dreno na planta forrageira </div><div class="t m0 x1 h4 y8 ff1 fs1 fc0 sc0 ls1 ws1"> </div><div class="t m0 x7 h5 y9 ff1 fs1 fc0 sc0 ls1 ws1">Lilian Elgalise Techio Pereira<span class="fs2 ls0 v1">1</span> e Adenilson José Paiva<span class="fs2 v1">1 </span></div><div class="t m0 x1 h4 ya ff1 fs1 fc0 sc0 ls1 ws1"> </div><div class="t m0 x1 h6 yb ff1 fs2 fc0 sc0 ls1 ws0">1<span class="fs1 ws1 v2">Zootecnista Aluna de mestrado do Programa de Pós-Graduação em Ciênc<span class="blank _3"></span>ia </span></div><div class="t m0 x1 h4 yc ff1 fs1 fc0 sc0 ls1 ws1">Animal e Pastagens ESALQ/USP </div><div class="t m0 x1 h4 yd ff1 fs1 fc0 sc0 ls1 ws1"> </div><div class="t m0 x1 h4 ye ff3 fs1 fc0 sc0 ls1 ws1">Resumo </div><div class="t m0 x1 h4 yf ff1 fs1 fc0 sc0 ls1 ws1">O <span class="blank _4"> </span>crescimento <span class="blank _4"> </span>de <span class="blank _4"> </span>plantas, <span class="blank _4"> </span>entendido <span class="blank _4"> </span>como <span class="blank _4"> </span>o <span class="blank _4"> </span>acúmulo <span class="blank _4"> </span>de <span class="blank _4"> </span>m<span class="blank _3"></span>atéria <span class="blank _4"> </span>seca, </div><div class="t m0 x1 h4 y10 ff1 fs1 fc0 sc0 ls1 ws1">depende <span class="blank _1"> </span>qu<span class="blank _2"> </span>ase <span class="blank _1"> </span>que <span class="blank _1"> </span>i<span class="blank _2"> </span>nteiramente <span class="blank _1"> </span>da <span class="blank _0"> </span>fotossíntese, <span class="blank _1"> </span>processo <span class="blank _0"> </span>caracterizado <span class="blank _1"> </span>pela </div><div class="t m0 x1 h4 y11 ff1 fs1 fc0 sc0 ls1 ws1">utilização <span class="blank _1"> </span>da <span class="blank _5"> </span>luz <span class="blank _5"> </span>solar <span class="blank _1"> </span>para <span class="blank _1"> </span>fixar <span class="blank _5"> </span>o <span class="blank _5"> </span>g<span class="blank _2"> </span>ás <span class="blank _5"> </span>carbôn<span class="blank _2"> </span>ico <span class="blank _5"> </span>da <span class="blank _5"> </span>atmosfer<span class="blank _2"> </span>a <span class="blank _5"> </span>e <span class="blank _5"> </span>utilização <span class="blank _1"> </span>na </div><div class="t m0 x1 h4 y12 ff1 fs1 fc0 sc0 ls1 ws1">síntese <span class="blank _6"> </span>de <span class="blank _6"> </span>uma <span class="blank _6"> </span>s<span class="blank _2"> </span>érie <span class="blank _6"> </span>d<span class="blank _2"> </span>e <span class="blank _6"> </span>moléculas <span class="blank _6"> </span>org<span class="blank _2"> </span>ânicas <span class="blank _6"> </span>complexas <span class="blank _6"> </span>q<span class="blank _2"> </span>ue <span class="blank _6"> </span>atuam <span class="blank _6"> </span>nos </div><div class="t m0 x1 h4 y13 ff1 fs1 fc0 sc0 ls1 ws1">processos <span class="blank _4"> </span>fisiológicos <span class="blank _7"> </span>responsáveis <span class="blank _4"> </span>pela <span class="blank _4"> </span>manutenção <span class="blank _4"> </span>de <span class="blank _7"> </span>material <span class="blank _4"> </span>vegetal. </div><div class="t m0 x1 h4 y14 ff1 fs1 fc0 sc0 ls1 ws1">Existe <span class="blank _5"> </span>uma <span class="blank _5"> </span>hierarquia <span class="blank _5"> </span>na <span class="blank _5"> </span>partição <span class="blank _5"> </span>de <span class="blank _5"> </span>assimilados <span class="blank _5"> </span>p<span class="blank _2"> </span>roduzidos <span class="blank _5"> </span>pela <span class="blank _5"> </span>fotossíntese </div><div class="t m0 x1 h4 y15 ff1 fs1 fc0 sc0 ls1 ws1">na <span class="blank _8"> </span>fabricação <span class="blank _8"> </span>d<span class="blank _2"> </span>os <span class="blank _8"> </span>diferen<span class="blank _2"> </span>tes <span class="blank _8"> </span>compartimentos <span class="blank _8"> </span>que <span class="blank _8"> </span>co<span class="blank _2"> </span>mpõem <span class="blank _8"> </span>a <span class="blank _8"> </span>bi<span class="blank _2"> </span>omassa </div><div class="t m0 x1 h4 y16 ff1 fs1 fc0 sc0 ls1 ws1">vegetal, qu<span class="blank _2"> </span>e pr<span class="blank _2"> </span>ioriza a <span class="blank _2"> </span>expansão <span class="blank _2"> </span>e <span class="blank _2"> </span>manutenção de <span class="blank _2"> </span>órgão<span class="blank _2"> </span>s essenciais. O <span class="blank _2"> </span>padrão </div><div class="t m0 x1 h4 y17 ff1 fs1 fc0 sc0 ls1 ws1">de <span class="blank _9"> </span>translocação <span class="blank _2"> </span>d<span class="blank _2"> </span>e <span class="blank _9"> </span>assimil<span class="blank _3"></span>ados <span class="blank _9"> </span>a <span class="blank _9"> </span>partir <span class="blank _9"> </span>da <span class="blank _2"> </span>fon<span class="blank _2"> </span>tes <span class="blank _9"> </span>e <span class="blank _2"> </span>os <span class="blank _9"> </span>órgãos <span class="blank _9"> </span>\u201calvo\u201d <span class="blank _9"> </span>ou <span class="blank _2"> </span>drenos </div><div class="t m0 x1 h4 y18 ff1 fs1 fc0 sc0 ls1 ws1">dependem <span class="blank _9"> </span>do <span class="blank _2"> </span>estágio <span class="blank _9"> </span>fisiológico <span class="blank _2"> </span>d<span class="blank _2"> </span>a <span class="blank _9"> </span>planta<span class="blank _3"></span> <span class="blank _9"> </span>ou <span class="blank _2"> </span>con<span class="blank _2"> </span>dições <span class="blank _9"> </span>de <span class="blank _2"> </span>ambiente <span class="blank _9"> </span>e <span class="blank _9"> </span>manejo </div><div class="t m0 x1 h4 y19 ff1 fs1 fc0 sc0 ls1 ws1">a <span class="blank _2"> </span>qual <span class="blank _9"> </span>está <span class="blank _2"> </span>submetida. <span class="blank _2"> </span>A <span class="blank _2"> </span>i<span class="blank _2"> </span>mportância <span class="blank _2"> </span>destes <span class="blank _9"> </span>processos <span class="blank _2"> </span>reside <span class="blank _2"> </span>no <span class="blank _2"> </span>fa<span class="blank _2"> </span>to <span class="blank _2"> </span>de <span class="blank _9"> </span>que é </div><div class="t m0 x1 h4 y1a ff1 fs1 fc0 sc0 ls1 ws1">possível <span class="blank _2"> </span>maximizar <span class="blank _2"> </span>o <span class="blank _2"> </span>crescimento <span class="blank _2"> </span>vege<span class="blank _2"> </span>tal<span class="blank _3"></span>, <span class="blank _2"> </span>em <span class="blank _2"> </span>re<span class="blank _2"> </span>lação <span class="blank _2"> </span>aos órgãos <span class="blank _2"> </span>de <span class="blank _2"> </span>i<span class="blank _2"> </span>nteresse, </div><div class="t m0 x1 h4 y1b ff1 fs1 fc0 sc0 ls1 ws1">tais <span class="blank _a"> </span>como <span class="blank _a"> </span>p<span class="blank _2"> </span>rodução <span class="blank _a"> </span>de<span class="blank _2"> </span> <span class="blank _a"> </span>sementes <span class="blank _a"> </span>ou <span class="blank _a"> </span>prod<span class="blank _2"> </span>ução <span class="blank _a"> </span>folhas <span class="blank _a"> </span>no <span class="blank _a"> </span>caso <span class="blank _a"> </span>de<span class="blank _2"> </span> <span class="blank _a"> </span>pastagens, </div><div class="t m0 x1 h4 y1c ff1 fs1 fc0 sc0 ls1 ws1">quando <span class="blank _b"> </span>se <span class="blank _b"> </span>conhecem <span class="blank _c"> </span>os <span class="blank _c"> </span>princípios <span class="blank _b"> </span>que <span class="blank _c"> </span>reg<span class="blank _2"> </span>em <span class="blank _c"> </span>o <span class="blank _b"> </span>carregamento <span class="blank _c"> </span>e </div><div class="t m0 x1 h4 y1d ff1 fs1 fc0 sc0 ls1 ws1">descarregamento <span class="blank _d"> </span>dos <span class="blank _d"> </span>produtos <span class="blank _d"> </span>da <span class="blank _d"> </span>fotossíntese <span class="blank _d"> </span>atrav<span class="blank _2"> </span>és <span class="blank _d"> </span>do <span class="blank _d"> </span>floema, <span class="blank _d"> </span>pois </div><div class="t m0 x1 h4 y1e ff1 fs1 fc0 sc0 ls1 ws1">algumas <span class="blank _a"> </span>pr<span class="blank _2"> </span>áticas <span class="blank _a"> </span>d<span class="blank _2"> </span>e <span class="blank _e"> </span>manejo <span class="blank _a"> </span>d<span class="blank _2"> </span>e <span class="blank _e"> </span>certas <span class="blank _e"> </span>culturas <span class="blank _e"> </span>são <span class="blank _a"> </span>uma <span class="blank _e"> </span>interferê<span class="blank _2"> </span>ncia <span class="blank _a"> </span>dire<span class="blank _2"> </span>ta </div></div><div class="pi" data-data="{"ctm":[1.000000,0.000000,0.000000,1.000000,0.000000,0.000000]}"></div></div> <div id="pf2" class="pf w0 h0" data-page-no="2"><div class="pc pc2 w0 h0"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls1 ws1">Pereira, <span class="blank _0"> </span>L.E.T. <span class="blank _0"> </span>e <span class="blank _1"> </span>Paiva<span class="blank _2"> </span>, <span class="blank _0"> </span>A.J. <span class="blank _0"> </span>O <span class="blank _1"> </span>ma<span class="blank _2"> </span>nejo <span class="blank _0"> </span>de <span class="blank _1"> </span>pas<span class="blank _2"> </span>tagens <span class="blank _0"> </span>e <span class="blank _1"> </span>as<span class="blank _2"> </span> <span class="blank _1"> </span>re<span class="blank _2"> </span>lações <span class="blank _0"> </span>fonte/dren<span class="blank _2"> </span>o <span class="blank _0"> </span>na <span class="blank _1"> </span>planta<span class="blank _2"> </span> </div><div class="t m0 x1 h2 y2 ff1 fs0 fc0 sc0 ls1 ws1">forrageira. PU<span class="blank _2"> </span>BVET, V.2, N.22, <span class="blank _2"> </span>Art#244, <span class="blank _2"> </span>Jun1, 2008<span class="blank _2"> </span>.<span class="ff2 fs1"> </span></div><div class="t m0 x2 h3 y3 ff2 fs1 fc0 sc0 ls1 ws1"> </div><div class="t m0 x1 h4 y1f ff1 fs1 fc0 sc0 ls1 ws1">nas relações <span class="blank _2"> </span>fonte/dre<span class="blank _2"> </span>no. Em p<span class="blank _2"> </span>astagens sob<span class="blank _2"> </span> co<span class="blank _2"> </span>ndição de pastejo <span class="blank _2"> </span>a d<span class="blank _2"> </span>esfolhação </div><div class="t m0 x1 h4 y20 ff1 fs1 fc0 sc0 ls1 ws1">é <span class="blank _9"> </span>o <span class="blank _9"> </span>fa<span class="blank _2"> </span>tor <span class="blank _9"> </span>d<span class="blank _2"> </span>e <span class="blank _9"> </span>manejo <span class="blank _5"> </span>que <span class="blank _9"> </span>mais <span class="blank _9"> </span>i<span class="blank _2"> </span>nterfere <span class="blank _9"> </span>na <span class="blank _5"> </span>partição <span class="blank _9"> </span>de<span class="blank _2"> </span> <span class="blank _9"> </span>assimilados, <span class="blank _9"> </span>cujo <span class="blank _5"> </span>efeito </div><div class="t m0 x1 h4 y21 ff1 fs1 fc0 sc0 ls1 ws1">no <span class="blank"> </span>crescimento <span class="blank"> </span>da <span class="blank"> </span>plan<span class="blank _3"></span>ta <span class="blank"> </span>durante <span class="blank"> </span>o <span class="blank"> </span>período <span class="blank"> </span>de <span class="blank"> </span>reb<span class="blank _3"></span>rotação <span class="blank"> </span>é <span class="blank"> </span>gradativo <span class="blank _f"> </span>e </div><div class="t m0 x1 h4 y22 ff1 fs1 fc0 sc0 ls1 ws1">dependente <span class="blank _e"> </span>da <span class="blank _e"> </span>intensidade <span class="blank _10"> </span>de <span class="blank _e"> </span>remoção <span class="blank _e"> </span>da <span class="blank _e"> </span>á<span class="blank _2"> </span>rea <span class="blank _e"> </span>foliar <span class="blank _e"> </span>e <span class="blank _e"> </span>da<span class="blank _2"> </span> <span class="blank _a"> </span>d<span class="blank _2"> </span>ecapitação <span class="blank _e"> </span>dos </div><div class="t m0 x1 h4 y23 ff1 fs1 fc0 sc0 ls1 ws1">perfilhos. <span class="blank _8"> </span>Essa <span class="blank _d"> </span>i<span class="blank _3"></span>nter<span class="blank _2"> </span>ferência <span class="blank _8"> </span>pode <span class="blank _d"> </span>ser <span class="blank _8"> </span>positiva <span class="blank _11"> </span>ou <span class="blank _8"> </span>neg<span class="blank _2"> </span>ativa, <span class="blank _8"> </span>conforme <span class="blank _11"> </span>a </div><div class="t m0 x1 h4 y24 ff1 fs1 fc0 sc0 ls1 ws1">habilidade <span class="blank _e"> </span>da <span class="blank _a"> </span>pl<span class="blank _2"> </span>anta <span class="blank _a"> </span>em <span class="blank _e"> </span>restabelecer <span class="blank _e"> </span>uma <span class="blank _a"> </span>nova<span class="blank _2"> </span> <span class="blank _e"> </span>partição <span class="blank _a"> </span>de<span class="blank _2"> </span> <span class="blank _a"> </span>assimilados <span class="blank _e"> </span>das </div><div class="t m0 x1 h4 y25 ff1 fs1 fc0 sc0 ls1 ws1">novas <span class="blank _1"> </span>fontes <span class="blank _1"> </span>para <span class="blank _1"> </span>os <span class="blank _0"> </span>novos <span class="blank _5"> </span>d<span class="blank _2"> </span>renos. <span class="blank _1"> </span>Portanto <span class="blank _1"> </span>conhecer <span class="blank _1"> </span>a <span class="blank _1"> </span>habilidade <span class="blank _1"> </span>de <span class="blank _1"> </span>p<span class="blank _2"> </span>lanta </div><div class="t m0 x1 h4 y26 ff1 fs1 fc0 sc0 ls1 ws1">na <span class="blank _0"> </span>partição <span class="blank _0"> </span>e <span class="blank _0"> </span>alo<span class="blank _2"> </span>cação <span class="blank _0"> </span>d<span class="blank _2"> </span>e <span class="blank _0"> </span>assimilados <span class="blank _0"> </span>é <span class="blank _0"> </span>d<span class="blank _2"> </span>e <span class="blank _0"> </span>fundamental <span class="blank _0"> </span>importância <span class="blank _0"> </span>para <span class="blank _0"> </span>se </div><div class="t m0 x1 h4 y27 ff1 fs1 fc0 sc0 ls1 ws1">adotar <span class="blank _1"> </span>manejo<span class="blank _2"> </span>s <span class="blank _1"> </span>em <span class="blank _0"> </span>que <span class="blank _0"> </span>se <span class="blank _1"> </span>tenha <span class="blank _0"> </span>o <span class="blank _1"> </span>maior <span class="blank _0"> </span>rendimento <span class="blank _0"> </span>produtivo <span class="blank _1"> </span>(exe<span class="blank _2"> </span>mplo <span class="blank _1"> </span>kg </div><div class="t m0 x1 h4 y28 ff1 fs1 fc0 sc0 ls1 ws1">de <span class="blank _12"> </span>carne <span class="blank _13"> </span>produzidos <span class="blank _13"> </span>po<span class="blank _2"> </span>r <span class="blank _13"> </span>á<span class="blank _2"> </span>rea), <span class="blank _13"> </span>sem <span class="blank _13"> </span>comp<span class="blank _2"> </span>rometer <span class="blank _13"> </span>a <span class="blank _12"> </span>persistência <span class="blank _13"> </span>e </div><div class="t m0 x1 h4 y29 ff1 fs1 fc0 sc0 ls1 ws1">produtividade da planta. <span class="blank _14"> </span> </div><div class="t m0 x8 h4 y2a ff3 fs1 fc0 sc0 ls1 ws1"> </div><div class="t m0 x9 h4 y2b ff3 fs1 fc0 sc0 ls1 ws1">The pasture management and relations<span class="blank _2"> </span> source/sink in forage crops </div><div class="t m0 xa h4 y2c ff1 fs1 fc0 sc0 ls1 ws1"> </div><div class="t m0 x1 h4 y2d ff3 fs1 fc0 sc0 ls1 ws1">Abstract <span class="blank _1"> </span>\u2013 <span class="blank _0"> </span><span class="ff1">Plant <span class="blank _1"> </span>gro<span class="blank _2"> </span>wth, <span class="blank _1"> </span>taken <span class="blank _0"> </span>as <span class="blank _1"> </span>d<span class="blank _2"> </span>ry <span class="blank _1"> </span>matter <span class="blank _0"> </span>accumulation, <span class="blank _1"> </span>depends <span class="blank _0"> </span>almost </span></div><div class="t m0 x1 h4 y2e ff1 fs1 fc0 sc0 ls1 ws1">entirely <span class="blank _9"> </span>on <span class="blank _9"> </span>photosynthesis, <span class="blank _9"> </span>process <span class="blank _9"> </span>characterized <span class="blank _9"> </span>by <span class="blank _9"> </span>the <span class="blank _9"> </span>use <span class="blank _9"> </span>of <span class="blank _9"> </span>the <span class="blank _9"> </span>sunlight <span class="blank _9"> </span>to </div><div class="t m0 x1 h4 y2f ff1 fs1 fc0 sc0 ls1 ws1">sequestrate <span class="blank _1"> </span>carbon <span class="blank _1"> </span>gas <span class="blank _0"> </span>from <span class="blank _1"> </span>the <span class="blank _1"> </span>atmosphere <span class="blank _1"> </span>and<span class="blank _2"> </span> <span class="blank _1"> </span>use <span class="blank _1"> </span>it <span class="blank _1"> </span>in <span class="blank _1"> </span>the <span class="blank _1"> </span>synthesis <span class="blank _1"> </span>of <span class="blank _0"> </span>a </div><div class="t m0 x1 h4 y30 ff1 fs1 fc0 sc0 ls1 ws1">series <span class="blank"> </span>of<span class="blank _3"></span> <span class="blank"> </span>complex <span class="blank _f"> </span>organic <span class="blank"> </span>m<span class="blank _3"></span>olecules <span class="blank _f"> </span>that <span class="blank _f"> </span>act <span class="blank _f"> </span>in <span class="blank"> </span>the <span class="blank _f"> </span>physiologic <span class="blank _f"> </span>processes </div><div class="t m0 x1 h4 y31 ff1 fs1 fc0 sc0 ls1 ws1">responsible <span class="blank _0"> </span>for <span class="blank _0"> </span>the <span class="blank _0"> </span>maintenance <span class="blank _0"> </span>of <span class="blank _a"> </span>vegetal <span class="blank _0"> </span>material. <span class="blank _1"> </span> <span class="blank _a"> </span>There <span class="blank _0"> </span>is <span class="blank _0"> </span>a <span class="blank _0"> </span>hierar<span class="blank _2"> </span>chy <span class="blank _0"> </span>in </div><div class="t m0 x1 h4 y32 ff1 fs1 fc0 sc0 ls1 ws1">partition <span class="blank _5"> </span>of <span class="blank _9"> </span>a<span class="blank _2"> </span>ssimilates <span class="blank _5"> </span>p<span class="blank _2"> </span>roduced <span class="blank _5"> </span>from <span class="blank _5"> </span>photosynthesis <span class="blank _5"> </span>in <span class="blank _9"> </span>t<span class="blank _2"> </span>he <span class="blank _5"> </span>production <span class="blank _5"> </span>of <span class="blank _5"> </span>the </div><div class="t m0 x1 h4 y33 ff1 fs1 fc0 sc0 ls1 ws1">different <span class="blank _e"> </span>compa<span class="blank _2"> </span>rtments <span class="blank _e"> </span>that <span class="blank _e"> </span>comp<span class="blank _2"> </span>ose <span class="blank _e"> </span>the <span class="blank _10"> </span>ve<span class="blank _2"> </span>getal <span class="blank _e"> </span>biomass, <span class="blank _e"> </span>which <span class="blank _e"> </span>p<span class="blank _2"> </span>rioritizes </div><div class="t m0 x1 h4 y34 ff1 fs1 fc0 sc0 ls1 ws1">the <span class="blank _5"> </span>expansion <span class="blank _5"> </span>and <span class="blank _5"> </span>maintenance <span class="blank _5"> </span>of <span class="blank _1"> </span>essential <span class="blank _5"> </span>organs. <span class="blank _5"> </span>The <span class="blank _5"> </span>translocation <span class="blank _5"> </span>pattern </div><div class="t m0 x1 h4 y35 ff1 fs1 fc0 sc0 ls1 ws1">of <span class="blank _11"> </span>assimilates <span class="blank _8"> </span>fr<span class="blank _2"> </span>om <span class="blank _11"> </span>sources <span class="blank _11"> </span>and <span class="blank _11"> </span>target <span class="blank _11"> </span>organs <span class="blank _11"> </span>or <span class="blank _11"> </span>sink <span class="blank _8"> </span>d<span class="blank _2"> </span>epend <span class="blank _11"> </span>on <span class="blank _11"> </span>the </div><div class="t m0 x1 h4 y36 ff1 fs1 fc0 sc0 ls1 ws1">physiologic <span class="blank"> </span>sta<span class="blank _3"></span>ge <span class="blank"> </span>of <span class="blank"> </span>th<span class="blank _3"></span>e <span class="blank"> </span>plant <span class="blank _f"> </span>or <span class="blank"> </span>at<span class="blank _3"></span>mosphere <span class="blank"> </span>conditions <span class="blank _f"> </span>and <span class="blank"> </span>man<span class="blank _3"></span>agement </div><div class="t m0 x1 h4 y37 ff1 fs1 fc0 sc0 ls1 ws1">which it <span class="blank _2"> </span>is <span class="blank _2"> </span>submitted<span class="blank _2"> </span> to. <span class="blank _2"> </span>The <span class="blank _2"> </span>importance <span class="blank _2"> </span>of <span class="blank _2"> </span>these <span class="blank _2"> </span>processes lies <span class="blank _2"> </span>in <span class="blank _2"> </span>the <span class="blank _2"> </span>fact <span class="blank _2"> </span>that </div><div class="t m0 x1 h4 y38 ff1 fs1 fc0 sc0 ls1 ws1">it <span class="blank _e"> </span>is <span class="blank _e"> </span>p<span class="blank _2"> </span>ossible <span class="blank _e"> </span>to <span class="blank _10"> </span>maximize <span class="blank _e"> </span>the <span class="blank _10"> </span>veg<span class="blank _2"> </span>etal <span class="blank _e"> </span>growth, <span class="blank _e"> </span>r<span class="blank _2"> </span>egarding <span class="blank _e"> </span>org<span class="blank _2"> </span>ans <span class="blank _e"> </span>of <span class="blank _10"> </span>interest, </div><div class="t m0 x1 h4 y39 ff1 fs1 fc0 sc0 ls1 ws1">such <span class="blank _0"> </span>as <span class="blank _0"> </span>seeds <span class="blank _0"> </span>production <span class="blank _0"> </span>or <span class="blank _0"> </span>le<span class="blank _2"> </span>aves <span class="blank _0"> </span>production <span class="blank _0"> </span>in <span class="blank _0"> </span>pastures, <span class="blank _0"> </span>when <span class="blank _0"> </span>it <span class="blank _0"> </span>is <span class="blank _0"> </span>k<span class="blank _2"> </span>nown </div><div class="t m0 x1 h4 y3a ff1 fs1 fc0 sc0 ls1 ws1">the <span class="blank _6"> </span>principles <span class="blank _6"> </span>that <span class="blank _6"> </span>govern <span class="blank _6"> </span>the <span class="blank _6"> </span>sh<span class="blank _3"></span>ipment <span class="blank _6"> </span>and <span class="blank _6"> </span>unloading <span class="blank _6"> </span>of <span class="blank _6"> </span>photosynthesis </div><div class="t m0 x1 h4 y3b ff1 fs1 fc0 sc0 ls1 ws1">products <span class="blank _5"> </span>through <span class="blank _5"> </span>the <span class="blank _5"> </span>phloem, <span class="blank _5"> </span>because <span class="blank _5"> </span>some <span class="blank _5"> </span>crops <span class="blank _5"> </span>management <span class="blank _5"> </span>practices <span class="blank _5"> </span>are </div><div class="t m0 x1 h4 y3c ff1 fs1 fc0 sc0 ls1 ws1">a <span class="blank _f"> </span>direct <span class="blank _f"> </span>i<span class="blank _3"></span>nterference <span class="blank _f"> </span>in <span class="blank _15"> </span>the <span class="blank _f"> </span>relationships <span class="blank _15"> </span>source/<span class="blank _2"> </span>sink. <span class="blank _15"> </span> <span class="blank _15"> </span> <span class="blank _f"> </span>In <span class="blank _15"> </span>pastures <span class="blank _f"> </span>under </div><div class="t m0 x1 h4 y3d ff1 fs1 fc0 sc0 ls1 ws1">grazing <span class="blank _5"> </span>condition,<span class="blank _3"></span> <span class="blank _5"> </span>the <span class="blank _9"> </span>defoliation <span class="blank _5"> </span>is <span class="blank _9"> </span>the <span class="blank _5"> </span>management <span class="blank _5"> </span>fact<span class="blank _3"></span>or <span class="blank _5"> </span>that <span class="blank _9"> </span>interferes <span class="blank _5"> </span>the </div></div><div class="pi" data-data="{"ctm":[1.000000,0.000000,0.000000,1.000000,0.000000,0.000000]}"></div></div> <div id="pf3" class="pf w0 h0" data-page-no="3"><div class="pc pc3 w0 h0"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls1 ws1">Pereira, <span class="blank _0"> </span>L.E.T. <span class="blank _0"> </span>e <span class="blank _1"> </span>Paiva<span class="blank _2"> </span>, <span class="blank _0"> </span>A.J. <span class="blank _0"> </span>O <span class="blank _1"> </span>ma<span class="blank _2"> </span>nejo <span class="blank _0"> </span>de <span class="blank _1"> </span>pas<span class="blank _2"> </span>tagens <span class="blank _0"> </span>e <span class="blank _1"> </span>as<span class="blank _2"> </span> <span class="blank _1"> </span>re<span class="blank _2"> </span>lações <span class="blank _0"> </span>fonte/dren<span class="blank _2"> </span>o <span class="blank _0"> </span>na <span class="blank _1"> </span>planta<span class="blank _2"> </span> </div><div class="t m0 x1 h2 y2 ff1 fs0 fc0 sc0 ls1 ws1">forrageira. PU<span class="blank _2"> </span>BVET, V.2, N.22, <span class="blank _2"> </span>Art#244, <span class="blank _2"> </span>Jun1, 2008<span class="blank _2"> </span>.<span class="ff2 fs1"> </span></div><div class="t m0 x2 h3 y3 ff2 fs1 fc0 sc0 ls1 ws1"> </div><div class="t m0 x1 h4 y1f ff1 fs1 fc0 sc0 ls1 ws1">most <span class="blank _1"> </span>in <span class="blank _1"> </span>the <span class="blank _0"> </span>partition <span class="blank _1"> </span>of <span class="blank _1"> </span>assimilates,<span class="blank _2"> </span> <span class="blank _1"> </span>whose <span class="blank _1"> </span>effe<span class="blank _2"> </span>ct <span class="blank _1"> </span>in <span class="blank _1"> </span>the <span class="blank _0"> </span>plant <span class="blank _1"> </span>growth <span class="blank _1"> </span>p<span class="blank _2"> </span>rocess </div><div class="t m0 x1 h4 y20 ff1 fs1 fc0 sc0 ls1 ws1">during <span class="blank"> </span>the <span class="blank"> </span>regrowth <span class="blank"> </span>period <span class="blank _6"> </span>i<span class="blank _3"></span>s <span class="blank"> </span>gradual <span class="blank"> </span>an<span class="blank _3"></span>d <span class="blank"> </span>depe<span class="blank _2"> </span>ndent <span class="blank"> </span>on <span class="blank"> </span>th<span class="blank _3"></span>e <span class="blank"> </span>intensity <span class="blank _6"> </span>of<span class="blank _3"></span> </div><div class="t m0 x1 h4 y21 ff1 fs1 fc0 sc0 ls1 ws1">removal <span class="blank _2"> </span>of <span class="blank _2"> </span>the <span class="blank _2"> </span>foliar <span class="blank _9"> </span>area<span class="blank _3"></span> <span class="blank _2"> </span>and <span class="blank _2"> </span>o<span class="blank _2"> </span>f the <span class="blank _2"> </span>decapitation <span class="blank _2"> </span>of <span class="blank _2"> </span>the <span class="blank _2"> </span>tiller. <span class="blank _9"> </span>This interference </div><div class="t m0 x1 h4 y22 ff1 fs1 fc0 sc0 ls1 ws1">can be positive or negative, according to the ability of the plant to reestablish a </div><div class="t m0 x1 h4 y23 ff1 fs1 fc0 sc0 ls1 ws1">new <span class="blank _5"> </span>partition <span class="blank _9"> </span>of <span class="blank _5"> </span>assimilates <span class="blank _5"> </span>of <span class="blank _5"> </span>new <span class="blank _9"> </span>so<span class="blank _2"> </span>urces <span class="blank _5"> </span>to <span class="blank _9"> </span>new <span class="blank _5"> </span>sinks. <span class="blank _9"> </span> <span class="blank _1"> </span>Therefore, <span class="blank _5"> </span>knowing </div><div class="t m0 x1 h4 y24 ff1 fs1 fc0 sc0 ls1 ws1">the <span class="blank _9"> </span>plant <span class="blank _9"> </span>ability <span class="blank _9"> </span>in <span class="blank _9"> </span>t<span class="blank _2"> </span>he <span class="blank _9"> </span>p<span class="blank _2"> </span>artition <span class="blank _9"> </span>and <span class="blank _9"> </span>allocation <span class="blank _9"> </span>of <span class="blank _9"> </span>assimilate<span class="blank _2"> </span>s <span class="blank _9"> </span>is <span class="blank _9"> </span>of <span class="blank _5"> </span>fundamental </div><div class="t m0 x1 h4 y25 ff1 fs1 fc0 sc0 ls1 ws1">importance <span class="blank _15"> </span>to <span class="blank _15"> </span>ad<span class="blank _2"> </span>opt <span class="blank _15"> </span>management <span class="blank _15"> </span>strateg<span class="blank _2"> </span>ies <span class="blank _15"> </span>to <span class="blank _15"> </span>obtain <span class="blank _15"> </span>optimal <span class="blank _15"> </span>productivity </div><div class="t m0 x1 h4 y26 ff1 fs1 fc0 sc0 ls1 ws1">(example <span class="blank _2"> </span>meat <span class="blank _2"> </span>kg <span class="blank _2"> </span>pr<span class="blank _2"> </span>oduced <span class="blank _2"> </span>in the <span class="blank _9"> </span>area), <span class="blank _2"> </span>without affecting <span class="blank _2"> </span>the<span class="blank _2"> </span> <span class="blank _2"> </span>persistence <span class="blank _2"> </span>and </div><div class="t m0 x1 h4 y27 ff1 fs1 fc0 sc0 ls1 ws1">productivity of the plant. </div><div class="t m0 xb h4 y28 ff3 fs1 fc0 sc0 ls1 ws1"> </div><div class="t m0 xb h4 y29 ff3 fs1 fc0 sc0 ls1 ws1">1. Introdução </div><div class="t m0 x1 h4 y2a ff1 fs1 fc0 sc0 ls1 ws1"> </div><div class="t m0 xc h4 y2b ff1 fs1 fc0 sc0 ls1 ws1">A <span class="blank _6"> </span>mais <span class="blank _6"> </span>importante <span class="blank _6"> </span>característica<span class="blank _3"></span> <span class="blank _6"> </span>das <span class="blank _6"> </span>plantas <span class="blank _6"> </span>é <span class="blank _6"> </span>sua <span class="blank _6"> </span>habil<span class="blank _3"></span>idade <span class="blank _6"> </span>em </div><div class="t m0 x1 h4 y2c ff1 fs1 fc0 sc0 ls1 ws1">utilizar <span class="blank _5"> </span>a<span class="blank _2"> </span> <span class="blank _1"> </span>lu<span class="blank _2"> </span>z <span class="blank _1"> </span>solar <span class="blank _1"> </span>p<span class="blank _2"> </span>ara <span class="blank _1"> </span>fixar <span class="blank _0"> </span>o <span class="blank _1"> </span>gás <span class="blank _0"> </span>carbônico <span class="blank _1"> </span>da <span class="blank _1"> </span>atmosfera, <span class="blank _1"> </span>sinteti<span class="blank _2"> </span>zando <span class="blank _1"> </span>uma </div><div class="t m0 x1 h4 y2d ff1 fs1 fc0 sc0 ls1 ws1">série <span class="blank _5"> </span>de <span class="blank _5"> </span>m<span class="blank _2"> </span>oléculas <span class="blank _5"> </span>orgânicas <span class="blank _5"> </span>complexas. <span class="blank _5"> </span>Esse <span class="blank _5"> </span>p<span class="blank _2"> </span>rocesso <span class="blank _5"> </span>fisiológico, <span class="blank _5"> </span>que <span class="blank _5"> </span>ocor<span class="blank _2"> </span>re </div><div class="t m0 x1 h4 y2e ff1 fs1 fc0 sc0 ls1 ws1">nos <span class="blank _2"> </span>tecidos <span class="blank _9"> </span>clorofilados, <span class="blank _2"> </span>é <span class="blank _9"> </span>o <span class="blank _2"> </span>principal <span class="blank _2"> </span>responsável <span class="blank _9"> </span>pela <span class="blank _2"> </span>entrada <span class="blank _9"> </span>de <span class="blank _2"> </span>energia <span class="blank _2"> </span>livre </div><div class="t m0 x1 h4 y2f ff1 fs1 fc0 sc0 ls1 ws1">na biosfera (Floss, 2006). </div><div class="t m0 xc h4 y30 ff1 fs1 fc0 sc0 ls1 ws1">O <span class="blank _15"> </span>crescimento <span class="blank _15"> </span>das <span class="blank _15"> </span>culturas, <span class="blank _15"> </span>entendido <span class="blank _15"> </span>como <span class="blank _15"> </span>o <span class="blank _15"> </span>acúmulo <span class="blank _15"> </span>de <span class="blank _15"> </span>matéria<span class="blank _3"></span> </div><div class="t m0 x1 h4 y31 ff1 fs1 fc0 sc0 ls1 ws1">seca, de<span class="blank _2"> </span>pende q<span class="blank _2"> </span>uase <span class="blank _2"> </span>que <span class="blank _2"> </span>inteiramente <span class="blank _2"> </span>da <span class="blank _2"> </span>fotossíntese. <span class="blank _2"> </span>Se<span class="blank _2"> </span>gundo Taiz <span class="blank _2"> </span>& <span class="blank _2"> </span>Zieger </div><div class="t m0 x1 h4 y32 ff1 fs1 fc0 sc0 ls1 ws1">(2004), <span class="blank _0"> </span>cerca <span class="blank _a"> </span>de <span class="blank _1"> </span>90<span class="blank _2"> </span>% <span class="blank _0"> </span>da <span class="blank _0"> </span>massa <span class="blank _0"> </span>seca<span class="blank _2"> </span> <span class="blank _0"> </span>vege<span class="blank _2"> </span>tal <span class="blank _0"> </span>são <span class="blank _0"> </span>originadas <span class="blank _0"> </span>diretamente <span class="blank _0"> </span>da </div><div class="t m0 x1 h4 y33 ff1 fs1 fc0 sc0 ls1 ws1">assimilação fotossintética de carbono através da fotossíntese. </div><div class="t m0 xa h4 y34 ff1 fs1 fc0 sc0 ls1 ws1">A <span class="blank _8"> </span>utilização <span class="blank _8"> </span>dos <span class="blank _11"> </span>compostos <span class="blank _8"> </span>produzidos <span class="blank _11"> </span>na <span class="blank _8"> </span>fotossíntese <span class="blank _8"> </span>segue <span class="blank _11"> </span>uma </div><div class="t m0 x1 h4 y35 ff1 fs1 fc0 sc0 ls1 ws1">dinâmica <span class="blank _1"> </span>que<span class="blank _2"> </span> <span class="blank _0"> </span>prioriza <span class="blank _1"> </span>a <span class="blank _0"> </span>exp<span class="blank _2"> </span>ansão <span class="blank _0"> </span>e <span class="blank _0"> </span>man<span class="blank _3"></span>utenção <span class="blank _0"> </span>de <span class="blank _0"> </span>órgãos <span class="blank _1"> </span>esse<span class="blank _2"> </span>nciais, <span class="blank _1"> </span>sendo<span class="blank _2"> </span> </div><div class="t m0 x1 h4 y36 ff1 fs1 fc0 sc0 ls1 ws1">que <span class="blank _9"> </span>o <span class="blank _5"> </span>padrão <span class="blank _9"> </span>de <span class="blank _5"> </span>translocação <span class="blank _9"> </span>de <span class="blank _5"> </span>assimilados <span class="blank _9"> </span>e <span class="blank _5"> </span>os <span class="blank _9"> </span>órg<span class="blank _2"> </span>ão<span class="blank _3"></span>s <span class="blank _9"> </span>\u201calvo<span class="blank _2"> </span>\u201d <span class="blank _9"> </span>depe<span class="blank _2"> </span>ndem <span class="blank _9"> </span>do </div><div class="t m0 x1 h4 y37 ff1 fs1 fc0 sc0 ls1 ws1">estágio <span class="blank _0"> </span>fisiológico <span class="blank _0"> </span>da <span class="blank _0"> </span>p<span class="blank _2"> </span>lanta <span class="blank _0"> </span>ou <span class="blank _0"> </span>condições <span class="blank _a"> </span>de <span class="blank _0"> </span>ambiente <span class="blank _0"> </span>e <span class="blank _0"> </span>manejo <span class="blank _0"> </span>a <span class="blank _0"> </span>qu<span class="blank _2"> </span>al <span class="blank _0"> </span>está </div><div class="t m0 x1 h4 y38 ff1 fs1 fc0 sc0 ls1 ws1">submetida. Segu<span class="blank _2"> </span>ndo Mo<span class="blank _2"> </span>raes e<span class="blank _2"> </span>t a<span class="blank _2"> </span>l. <span class="blank _2"> </span>(1995) <span class="blank _2"> </span>existe <span class="blank _2"> </span>uma hierarq<span class="blank _2"> </span>uia na <span class="blank _2"> </span>par<span class="blank _2"> </span>tição d<span class="blank _2"> </span>e </div><div class="t m0 x1 h4 y39 ff1 fs1 fc0 sc0 ls1 ws1">assimilados <span class="blank _5"> </span>pa<span class="blank _2"> </span>ra <span class="blank _1"> </span>a <span class="blank _5"> </span>fabr<span class="blank _2"> </span>icação <span class="blank _5"> </span>do<span class="blank _2"> </span>s <span class="blank _5"> </span>diferentes <span class="blank _1"> </span>compartimentos <span class="blank _5"> </span>q<span class="blank _2"> </span>ue <span class="blank _5"> </span>co<span class="blank _2"> </span>mpõem <span class="blank _5"> </span>a </div><div class="t m0 x1 h4 y3a ff1 fs1 fc0 sc0 ls1 ws1">biomassa <span class="blank _6"> </span>vegetal <span class="blank _6"> </span>(folhas, <span class="blank _6"> </span>hastes, <span class="blank _6"> </span>ramifi<span class="blank _3"></span>cações <span class="blank _6"> </span>e <span class="blank _6"> </span>raízes). <span class="blank _6"> </span>Na <span class="blank _6"> </span>ausência <span class="blank _6"> </span>de </div><div class="t m0 x1 h4 y3b ff1 fs1 fc0 sc0 ls1 ws1">limitações <span class="blank _1"> </span>dos <span class="blank _0"> </span>recursos <span class="blank _0"> </span>temperatura, <span class="blank _1"> </span>á<span class="blank _2"> </span>gua, <span class="blank _1"> </span>N <span class="blank _0"> </span>e <span class="blank _0"> </span>luz, <span class="blank _1"> </span>a <span class="blank _1"> </span>p<span class="blank _2"> </span>rioridade<span class="blank _2"> </span> <span class="blank _1"> </span>de <span class="blank _0"> </span>alocação </div><div class="t m0 x1 h4 y3c ff1 fs1 fc0 sc0 ls1 ws1">dos <span class="blank _0"> </span>assimilados <span class="blank _a"> </span>é <span class="blank _0"> </span>para <span class="blank _a"> </span>atender <span class="blank _0"> </span>a <span class="blank _0"> </span>demanda <span class="blank _a"> </span>de <span class="blank _0"> </span>folhas, <span class="blank _0"> </span>hastes, <span class="blank _0"> </span>ra<span class="blank _2"> </span>mificações <span class="blank _0"> </span>e<span class="blank _2"> </span> </div><div class="t m0 x1 h4 y3d ff1 fs1 fc0 sc0 ls1 ws1">finalmente <span class="blank"> </span>r<span class="blank _2"> </span>aízes. <span class="blank _16"> </span>Na <span class="blank _16"> </span>ocorrência <span class="blank _16"> </span>de <span class="blank _16"> </span>limitações <span class="blank _16"> </span>de <span class="blank _16"> </span>algum <span class="blank _16"> </span>dos <span class="blank _16"> </span>fatores <span class="blank _16"> </span>que </div></div><div class="pi" data-data="{"ctm":[1.000000,0.000000,0.000000,1.000000,0.000000,0.000000]}"></div></div> <div id="pf4" class="pf w0 h0" data-page-no="4"><div class="pc pc4 w0 h0"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls1 ws1">Pereira, <span class="blank _0"> </span>L.E.T. <span class="blank _0"> </span>e <span class="blank _1"> </span>Paiva<span class="blank _2"> </span>, <span class="blank _0"> </span>A.J. <span class="blank _0"> </span>O <span class="blank _1"> </span>ma<span class="blank _2"> </span>nejo <span class="blank _0"> </span>de <span class="blank _1"> </span>pas<span class="blank _2"> </span>tagens <span class="blank _0"> </span>e <span class="blank _1"> </span>as<span class="blank _2"> </span> <span class="blank _1"> </span>re<span class="blank _2"> </span>lações <span class="blank _0"> </span>fonte/dren<span class="blank _2"> </span>o <span class="blank _0"> </span>na <span class="blank _1"> </span>planta<span class="blank _2"> </span> </div><div class="t m0 x1 h2 y2 ff1 fs0 fc0 sc0 ls1 ws1">forrageira. PU<span class="blank _2"> </span>BVET, V.2, N.22, <span class="blank _2"> </span>Art#244, <span class="blank _2"> </span>Jun1, 2008<span class="blank _2"> </span>.<span class="ff2 fs1"> </span></div><div class="t m0 x2 h3 y3 ff2 fs1 fc0 sc0 ls1 ws1"> </div><div class="t m0 x1 h4 y1f ff1 fs1 fc0 sc0 ls1 ws1">determinam <span class="blank _0"> </span>diminuição <span class="blank _0"> </span>na <span class="blank _0"> </span>oferta <span class="blank _0"> </span>d<span class="blank _2"> </span>e <span class="blank _0"> </span>carbono <span class="blank _0"> </span>(C), <span class="blank _0"> </span>a<span class="blank _2"> </span> <span class="blank _0"> </span>intensidade <span class="blank _0"> </span>de<span class="blank _2"> </span> <span class="blank _0"> </span>demanda </div><div class="t m0 x1 h4 y20 ff1 fs1 fc0 sc0 ls1 ws1">de <span class="blank _10"> </span>cada <span class="blank _10"> </span>um <span class="blank _10"> </span>dos <span class="blank _10"> </span>compartimentos <span class="blank _10"> </span>é <span class="blank _10"> </span>alterada, <span class="blank _10"> </span>e <span class="blank _10"> </span>a <span class="blank _10"> </span>prioridade <span class="blank _e"> </span>d<span class="blank _2"> </span>e <span class="blank _10"> </span>alocação <span class="blank _10"> </span>de </div><div class="t m0 x1 h4 y21 ff1 fs1 fc0 sc0 ls1 ws1">assimilados passa a ser para raízes e reservas. </div><div class="t m0 xa h4 y22 ff1 fs1 fc0 sc0 ls1 ws1">A <span class="blank _5"> </span>translocação <span class="blank _5"> </span>dos <span class="blank _5"> </span>produtos <span class="blank _5"> </span>da <span class="blank _5"> </span>fotossíntese <span class="blank _5"> </span>da <span class="blank _5"> </span>fonte <span class="blank _5"> </span>(local <span class="blank _9"> </span>d<span class="blank _2"> </span>e <span class="blank _5"> </span>produção </div><div class="t m0 x1 h4 y23 ff1 fs1 fc0 sc0 ls1 ws1">ou re<span class="blank _2"> </span>serva de <span class="blank _2"> </span>assimilados) <span class="blank _2"> </span>para o<span class="blank _2"> </span>s diverso<span class="blank _2"> </span>s drenos <span class="blank _2"> </span>se <span class="blank _2"> </span>faz pelo <span class="blank _2"> </span>floema. <span class="blank _2"> </span>Embora </div><div class="t m0 x1 h4 y24 ff1 fs1 fc0 sc0 ls1 ws1">o <span class="blank _9"> </span>modelo <span class="blank _9"> </span>de <span class="blank _9"> </span>transporte <span class="blank _9"> </span>pelo <span class="blank _9"> </span>floema <span class="blank _9"> </span>represente <span class="blank _9"> </span>simplesmente <span class="blank _9"> </span>o <span class="blank _2"> </span>mov<span class="blank _2"> </span>imento <span class="blank _2"> </span>da </div><div class="t m0 x1 h4 y25 ff1 fs1 fc0 sc0 ls1 ws1">fonte para o dreno, o ca<span class="blank _2"> </span>minho específico entre e<span class="blank _2"> </span>les é altamente complexo, pois </div><div class="t m0 x1 h4 y26 ff1 fs1 fc0 sc0 ls1 ws1">nem <span class="blank _0"> </span>todos <span class="blank _0"> </span>os <span class="blank _0"> </span>drenos <span class="blank _1"> </span>são<span class="blank _2"> </span> <span class="blank _0"> </span>igualmente <span class="blank _0"> </span>supridos <span class="blank _0"> </span>por <span class="blank _0"> </span>todas <span class="blank _1"> </span>as <span class="blank _0"> </span>folhas <span class="blank _0"> </span>da <span class="blank _0"> </span>planta, </div><div class="t m0 x1 h4 y27 ff1 fs1 fc0 sc0 ls1 ws1">uma <span class="blank _10"> </span>ve<span class="blank _2"> </span>z <span class="blank _10"> </span>que <span class="blank _17"> </span>cada <span class="blank _10"> </span>fonte <span class="blank _17"> </span>supre <span class="blank _10"> </span>drenos <span class="blank _10"> </span>e<span class="blank _2"> </span>specíficos, <span class="blank _10"> </span>sendo <span class="blank _17"> </span>que <span class="blank _10"> </span>o <span class="blank _17"> </span>modelo <span class="blank _10"> </span>de </div><div class="t m0 x1 h4 y28 ff1 fs1 fc0 sc0 ls1 ws1">distribuição <span class="blank _9"> </span>d<span class="blank _2"> </span>os <span class="blank _5"> </span>assimilados <span class="blank _5"> </span>é, <span class="blank _5"> </span>em <span class="blank _5"> </span>grande <span class="blank _5"> </span>parte, <span class="blank _5"> </span>função <span class="blank _5"> </span>da <span class="blank _9"> </span>p<span class="blank _2"> </span>roximidade <span class="blank _5"> </span>entre </div><div class="t m0 x1 h4 y29 ff1 fs1 fc0 sc0 ls1 ws1">os órgãos fontes e os drenos (Taiz & Zeiger, 2004). </div><div class="t m0 xa h4 y2a ff1 fs1 fc0 sc0 ls1 ws1">O <span class="blank _a"> </span>conhecimento <span class="blank _a"> </span>d<span class="blank _2"> </span>as <span class="blank _a"> </span>modificações <span class="blank _e"> </span>no <span class="blank _a"> </span>consumo <span class="blank _a"> </span>de<span class="blank _2"> </span> <span class="blank _a"> </span>C <span class="blank _e"> </span>e <span class="blank _a"> </span>de <span class="blank _e"> </span>sua <span class="blank _a"> </span>partição </div><div class="t m0 x1 h4 y2b ff1 fs1 fc0 sc0 ls1 ws1">entre <span class="blank _11"> </span>o<span class="blank _2"> </span>s <span class="blank _11"> </span>p<span class="blank _2"> </span>rincipais <span class="blank _11"> </span>componentes <span class="blank _d"> </span>do <span class="blank _11"> </span>rendimen<span class="blank _2"> </span>to <span class="blank _11"> </span>(<span class="blank _2"> </span>folhas, <span class="blank _11"> </span>hastes, <span class="blank _11"> </span>órgãos </div><div class="t m0 x1 h4 y2c ff1 fs1 fc0 sc0 ls1 ws1">reprodutivos <span class="blank"> </span>e<span class="blank _3"></span> <span class="blank _f"> </span>raíz) <span class="blank _15"> </span>p<span class="blank _2"> </span>rovocadas <span class="blank _f"> </span>por <span class="blank _f"> </span>limitações <span class="blank _f"> </span>ambienta<span class="blank _3"></span>is <span class="blank"> </span>é <span class="blank _15"> </span>essencial <span class="blank"> </span>n<span class="blank _3"></span>ão </div><div class="t m0 x1 h4 y2d ff1 fs1 fc0 sc0 ls1 ws1">apenas <span class="blank _15"> </span>para<span class="blank _2"> </span> <span class="blank _15"> </span>realizar <span class="blank _15"> </span>d<span class="blank _2"> </span>iagnósticos, <span class="blank _15"> </span>mas, <span class="blank _15"> </span>sobre<span class="blank _2"> </span>tudo, <span class="blank _15"> </span>para <span class="blank _15"> </span>construir <span class="blank _f"> </span>modelos </div><div class="t m0 x1 h4 y2e ff1 fs1 fc0 sc0 ls1 ws1">preditivos. <span class="blank _7"> </span>Identifica<span class="blank _2"> </span>r <span class="blank _7"> </span>e<span class="blank _2"> </span> <span class="blank _7"> </span>q<span class="blank _2"> </span>uantifica<span class="blank _3"></span>r <span class="blank _8"> </span>os <span class="blank _8"> </span>fatores <span class="blank _7"> </span>amb<span class="blank _2"> </span>ientais <span class="blank _7"> </span>que <span class="blank _8"> </span>limitam <span class="blank _7"> </span>a </div><div class="t m0 x1 h4 y2f ff1 fs1 fc0 sc0 ls1 ws1">expressão <span class="blank _7"> </span>do <span class="blank _7"> </span>po<span class="blank _2"> </span>tenci<span class="blank _3"></span>al <span class="blank _7"> </span>das <span class="blank _7"> </span>esp<span class="blank _2"> </span>écies <span class="blank _7"> </span>forrageiras <span class="blank _7"> </span>possibilita <span class="blank _7"> </span>estabelecer <span class="blank _7"> </span>a </div><div class="t m0 x1 h4 y30 ff1 fs1 fc0 sc0 ls1 ws1">melhor <span class="blank _16"> </span>for<span class="blank _2"> </span>ma <span class="blank _6"> </span>de <span class="blank _16"> </span>manejar <span class="blank _6"> </span>esses <span class="blank _6"> </span>fatores, <span class="blank _6"> </span>com <span class="blank _6"> </span>a <span class="blank _6"> </span>finalidade <span class="blank _16"> </span>de <span class="blank _6"> </span>otimizar <span class="blank _16"> </span>a<span class="blank _2"> </span> </div><div class="t m0 x1 h4 y31 ff1 fs1 fc0 sc0 ls1 ws1">produção animal (Silva et al., <span class="blank _3"></span>2001<span class="blank _2"> </span>). </div><div class="t m0 xc h4 y32 ff1 fs1 fc0 sc0 ls1 ws1"> </div><div class="t m0 x1 h4 y33 ff3 fs1 fc0 sc0 ls1 ws1">2. Produção de assimilados através da fotossíntese </div><div class="t m0 xc h4 y34 ff3 fs1 fc0 sc0 ls1 ws1"> </div><div class="t m0 xc h4 y35 ff1 fs1 fc0 sc0 ls1 ws1">A <span class="blank _a"> </span>fotossíntese <span class="blank _a"> </span>é <span class="blank _a"> </span>o <span class="blank _a"> </span>principal <span class="blank _a"> </span>processo <span class="blank _a"> </span>realiza<span class="blank _3"></span>do <span class="blank _a"> </span>pelas <span class="blank _a"> </span>plantas, <span class="blank _a"> </span>em <span class="blank _a"> </span>que </div><div class="t m0 x1 h4 y36 ff1 fs1 fc0 sc0 ls1 ws1">transforma <span class="blank _1"> </span>a <span class="blank _0"> </span>energia <span class="blank _0"> </span>luminosa <span class="blank _1"> </span>em <span class="blank _0"> </span>ener<span class="blank _2"> </span>gia <span class="blank _0"> </span>química <span class="blank _1"> </span>processando <span class="blank _1"> </span>o <span class="blank _0"> </span>dióx<span class="blank _2"> </span>ido <span class="blank _1"> </span>de </div><div class="t m0 x1 h4 y37 ff1 fs1 fc0 sc0 ls1 ws1">carbono <span class="blank _17"> </span>(CO<span class="fs2 ws0 v3">2</span>), <span class="blank _10"> </span>água <span class="blank _17"> </span>(H<span class="fs2 v3">2</span></div><div class="t m0 xd h4 y37 ff1 fs1 fc0 sc0 ls1 ws1">O) <span class="blank _17"> </span>e <span class="blank _17"> </span>elementos <span class="blank _10"> </span>minerais <span class="blank _17"> </span>em <span class="blank _10"> </span>c<span class="blank _2"> </span>ompostos <span class="blank _17"> </span>orgânicos, </div><div class="t m0 x1 h4 y38 ff1 fs1 fc0 sc0 ls1 ws1">com <span class="blank _a"> </span>formação <span class="blank _a"> </span>de <span class="blank _a"> </span>matéria <span class="blank _a"> </span>orgânica <span class="blank _a"> </span>(96% <span class="blank _a"> </span>da <span class="blank _a"> </span>p<span class="blank _2"> </span>lanta) <span class="blank _a"> </span>e <span class="blank _a"> </span>liberação <span class="blank _a"> </span>de <span class="blank _a"> </span>oxigênio </div><div class="t m0 x1 h4 y39 ff1 fs1 fc0 sc0 ls1 ws2">(O<span class="fs2 ws0 v3">2</span><span class="ws1">). <span class="blank _2"> </span>Em plantas su<span class="blank _2"> </span>periores, <span class="blank _2"> </span>o mesófilo <span class="blank _2"> </span>é o <span class="blank _2"> </span>tecido <span class="blank _2"> </span>mais ativo na <span class="blank _2"> </span>assimilação de </span></div><div class="t m0 x1 h4 y3a ff1 fs1 fc0 sc0 ls1 ws2">CO<span class="fs2 ws0 v3">2</span><span class="ws1">, <span class="blank _17"> </span>em <span class="blank _15"> </span>razã<span class="blank _3"></span>o <span class="blank _17"> </span>da <span class="blank _17"> </span>rique<span class="blank _2"> </span>za <span class="blank _17"> </span>de <span class="blank _15"> </span>suas<span class="blank _3"></span> <span class="blank _17"> </span>células <span class="blank _17"> </span>em <span class="blank _17"> </span>cloro<span class="blank _2"> </span>plastos <span class="blank _17"> </span>(Taiz <span class="blank _17"> </span>& <span class="blank _17"> </span>Zeige<span class="blank _2"> </span>r, </span></div><div class="t m0 x1 h4 y3b ff1 fs1 fc0 sc0 ls1 ws1">1998). </div><div class="t m0 xc h4 y3c ff1 fs1 fc0 sc0 ls1 ws1">Cerca <span class="blank _e"> </span>de <span class="blank _a"> </span>90% <span class="blank _a"> </span>da <span class="blank _e"> </span>massa <span class="blank _a"> </span>seca <span class="blank _a"> </span>v<span class="blank _2"> </span>egetal <span class="blank _a"> </span>são <span class="blank _a"> </span>o<span class="blank _2"> </span>riginadas <span class="blank _a"> </span>d<span class="blank _2"> </span>ireta<span class="blank _3"></span>mente <span class="blank _a"> </span>da </div><div class="t m0 x1 h4 y3d ff1 fs1 fc0 sc0 ls1 ws1">assimilação <span class="blank _18"> </span>fotossintética <span class="blank _19"> </span>de <span class="blank _18"> </span>carb<span class="blank _2"> </span>ono <span class="blank _18"> </span>através <span class="blank _19"> </span>da <span class="blank _19"> </span>fot<span class="blank _3"></span>ossíntese. <span class="blank _18"> </span>A <span class="blank _18"> </span>taxa<span class="blank _2"> </span> </div></div><div class="pi" data-data="{"ctm":[1.000000,0.000000,0.000000,1.000000,0.000000,0.000000]}"></div></div> <div id="pf5" class="pf w0 h0" data-page-no="5"><div class="pc pc5 w0 h0"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls1 ws1">Pereira, <span class="blank _0"> </span>L.E.T. <span class="blank _0"> </span>e <span class="blank _1"> </span>Paiva<span class="blank _2"> </span>, <span class="blank _0"> </span>A.J. <span class="blank _0"> </span>O <span class="blank _1"> </span>ma<span class="blank _2"> </span>nejo <span class="blank _0"> </span>de <span class="blank _1"> </span>pas<span class="blank _2"> </span>tagens <span class="blank _0"> </span>e <span class="blank _1"> </span>as<span class="blank _2"> </span> <span class="blank _1"> </span>re<span class="blank _2"> </span>lações <span class="blank _0"> </span>fonte/dren<span class="blank _2"> </span>o <span class="blank _0"> </span>na <span class="blank _1"> </span>planta<span class="blank _2"> </span> </div><div class="t m0 x1 h2 y2 ff1 fs0 fc0 sc0 ls1 ws1">forrageira. PU<span class="blank _2"> </span>BVET, V.2, N.22, <span class="blank _2"> </span>Art#244, <span class="blank _2"> </span>Jun1, 2008<span class="blank _2"> </span>.<span class="ff2 fs1"> </span></div><div class="t m0 x2 h3 y3 ff2 fs1 fc0 sc0 ls1 ws1"> </div><div class="t m0 x1 h4 y1f ff1 fs1 fc0 sc0 ls1 ws1">fotossintética <span class="blank _11"> </span>da <span class="blank _11"> </span>folha <span class="blank _11"> </span>d<span class="blank _2"> </span>etermina <span class="blank _11"> </span>a <span class="blank _11"> </span>q<span class="blank _2"> </span>uantidade <span class="blank _11"> </span>total <span class="blank _11"> </span>de<span class="blank _2"> </span> <span class="blank _11"> </span>carbono <span class="blank _11"> </span>fixada </div><div class="t m0 x1 h4 y20 ff1 fs1 fc0 sc0 ls1 ws1">disponível <span class="blank _2"> </span>pa<span class="blank _2"> </span>ra <span class="blank _2"> </span>a <span class="blank _2"> </span>folha <span class="blank _2"> </span>(<span class="blank _2"> </span>Taiz <span class="blank _2"> </span>& <span class="blank _9"> </span>Zeiger, <span class="blank _2"> </span>1998<span class="blank _2"> </span>) <span class="blank _2"> </span>e <span class="blank _9"> </span>é <span class="blank _2"> </span>função <span class="blank _2"> </span>de <span class="blank _9"> </span>fatores <span class="blank _2"> </span>intrínsecos, </div><div class="t m0 x1 h4 y21 ff1 fs1 fc0 sc0 ls1 ws1">como <span class="blank _9"> </span>o <span class="blank _2"> </span>nível<span class="blank _2"> </span> <span class="blank _2"> </span>d<span class="blank _2"> </span>e <span class="blank _9"> </span>inserção <span class="blank _9"> </span>e <span class="blank _9"> </span>a <span class="blank _2"> </span>id<span class="blank _2"> </span>ade, <span class="blank _2"> </span>e<span class="blank _2"> </span> <span class="blank _2"> </span>d<span class="blank _2"> </span>e <span class="blank _9"> </span>fatores <span class="blank _9"> </span>extrínsec<span class="blank _3"></span>os <span class="blank _9"> </span>às <span class="blank _2"> </span>folhas, <span class="blank _9"> </span>como <span class="blank _9"> </span>a </div><div class="t m0 x1 h4 y22 ff1 fs1 fc0 sc0 ls1 ws1">irradiância, <span class="blank _e"> </span>a <span class="blank _e"> </span>água<span class="blank _2"> </span> <span class="blank _e"> </span>no <span class="blank _10"> </span>solo, <span class="blank _e"> </span>a <span class="blank _10"> </span>temperatura <span class="blank _e"> </span>e <span class="blank _10"> </span>os <span class="blank _10"> </span>nutrientes. <span class="blank _e"> </span>Como <span class="blank _10"> </span>resultado </div><div class="t m0 x1 h4 y23 ff1 fs1 fc0 sc0 ls1 ws1">desse <span class="blank _9"> </span>conjunto d<span class="blank _2"> </span>e <span class="blank _9"> </span>fatores, a<span class="blank _2"> </span>s <span class="blank _2"> </span>fo<span class="blank _2"> </span>lhas <span class="blank _2"> </span>de<span class="blank _2"> </span> <span class="blank _2"> </span>m<span class="blank _2"> </span>ais <span class="blank _2"> </span>al<span class="blank _2"> </span>to <span class="blank _2"> </span>níve<span class="blank _2"> </span>l <span class="blank _2"> </span>de <span class="blank _9"> </span>inserção <span class="blank _2"> </span>no <span class="blank _9"> </span>perfilho, </div><div class="t m0 x1 h4 y24 ff1 fs1 fc0 sc0 ls1 ws1">mais <span class="blank _18"> </span>jovens <span class="blank _19"> </span>e <span class="blank _18"> </span>melhor <span class="blank _19"> </span>iluminadas, <span class="blank _18"> </span>fo<span class="blank _2"> </span>tossintetizam <span class="blank _18"> </span>mais <span class="blank _19"> </span>e <span class="blank _18"> </span>gera<span class="blank _2"> </span>lmente </div><div class="t m0 x1 h4 y25 ff1 fs1 fc0 sc0 ls1 ws1">contribuem <span class="blank _5"> </span>mais <span class="blank _1"> </span>para <span class="blank _1"> </span>o <span class="blank _5"> </span><span class="ff4">p<span class="blank _2"> </span>ool <span class="blank _5"> </span></span>d<span class="blank _2"> </span>e <span class="blank _1"> </span>fotoassimilados <span class="blank _1"> </span>da <span class="blank _5"> </span>p<span class="blank _2"> </span>lanta <span class="blank _5"> </span>que <span class="blank _1"> </span>as <span class="blank _1"> </span>folhas <span class="blank _5"> </span>mais </div><div class="t m0 x1 h4 y26 ff1 fs1 fc0 sc0 ls1 ws1">velhas, <span class="blank _16"> </span>de <span class="blank _16"> </span>mais <span class="blank _16"> </span>baixos <span class="blank _6"> </span>níveis <span class="blank _16"> </span>de <span class="blank _16"> </span>inserção. <span class="blank _16"> </span>A <span class="blank _16"> </span>biomassa <span class="blank _16"> </span>veg<span class="blank _2"> </span>etal <span class="blank"> </span>pod<span class="blank _2"> </span>e <span class="blank _16"> </span>ser </div><div class="t m0 x1 h4 y27 ff1 fs1 fc0 sc0 ls1 ws1">limitada <span class="blank _9"> </span>tanto <span class="blank _9"> </span>p<span class="blank _2"> </span>ela <span class="blank _5"> </span>produção <span class="blank _9"> </span>como <span class="blank _9"> </span>p<span class="blank _2"> </span>elo <span class="blank _9"> </span>uso <span class="blank _9"> </span>d<span class="blank _2"> </span>os <span class="blank _9"> </span>fotoa<span class="blank _2"> </span>ssimilados <span class="blank _9"> </span>por <span class="blank _5"> </span>parte <span class="blank _9"> </span>dos </div><div class="t m0 x1 h4 y28 ff1 fs1 fc0 sc0 ls1 ws1">meristemas foliares (Lemaire & Agnusdei, 1999). </div><div class="t m0 xc h4 y29 ff1 fs1 fc0 sc0 ls1 ws1">O <span class="blank _17"> </span>carbono <span class="blank _15"> </span>fixado <span class="blank _10"> </span>p<span class="blank _2"> </span>elas <span class="blank _17"> </span>folhas <span class="blank _17"> </span>pod<span class="blank _2"> </span>e <span class="blank _17"> </span>ser <span class="blank _17"> </span>alocado <span class="blank _17"> </span>p<span class="blank _2"> </span>ara <span class="blank _17"> </span>três <span class="blank _17"> </span>caminhos </div><div class="t m0 x1 h4 y2a ff1 fs1 fc0 sc0 ls1 ws1">metabólicos: <span class="blank _1"> </span>(i) <span class="blank _0"> </span>para <span class="blank _1"> </span>utilização <span class="blank _1"> </span>no <span class="blank _0"> </span>metabolismo <span class="blank _1"> </span>celular, <span class="blank _1"> </span>for<span class="blank _2"> </span>necendo <span class="blank _1"> </span>ene<span class="blank _2"> </span>rgia <span class="blank _5"> </span>e </div><div class="t m0 x1 h4 y2b ff1 fs1 fc0 sc0 ls1 ws1">esqueletos <span class="blank _5"> </span>de <span class="blank _9"> </span>car<span class="blank _2"> </span>bono <span class="blank _9"> </span>para <span class="blank _5"> </span>a <span class="blank _5"> </span>síntese <span class="blank _9"> </span>d<span class="blank _2"> </span>e <span class="blank _5"> </span>outros <span class="blank _9"> </span>compo<span class="blank _2"> </span>stos,<span class="blank _3"></span> <span class="blank _5"> </span>(ii) <span class="blank _9"> </span>p<span class="blank _2"> </span>ara <span class="blank _5"> </span>a <span class="blank _9"> </span>síntese<span class="blank _2"> </span> </div><div class="t m0 x1 h4 y2c ff1 fs1 fc0 sc0 ls1 ws1">de <span class="blank _1"> </span>co<span class="blank _2"> </span>mpostos <span class="blank _1"> </span>de <span class="blank _0"> </span>transporte, <span class="blank _1"> </span>ex<span class="blank _2"> </span>portados <span class="blank _1"> </span>p<span class="blank _2"> </span>ara <span class="blank _1"> </span>os <span class="blank _0"> </span>diversos <span class="blank _1"> </span>dre<span class="blank _2"> </span>nos <span class="blank _1"> </span>da <span class="blank _0"> </span>planta <span class="blank _1"> </span>e </div><div class="t m0 x1 h4 y2d ff1 fs1 fc0 sc0 ls1 ws1">(iii) <span class="blank _0"> </span>para <span class="blank _0"> </span>síntese <span class="blank _a"> </span>de <span class="blank _1"> </span>com<span class="blank _2"> </span>postos <span class="blank _0"> </span>armazenados, <span class="blank _a"> </span>para <span class="blank _0"> </span>utili<span class="blank _3"></span>zação <span class="blank _0"> </span>durante <span class="blank _0"> </span>a<span class="blank _2"> </span> <span class="blank _0"> </span>noite </div><div class="t m0 x1 h4 y2e ff1 fs1 fc0 sc0 ls1 ws1">(Taiz & Zeiger, 1998). </div><div class="t m0 xc h4 y2f ff1 fs1 fc0 sc0 ls1 ws1"> </div><div class="t m0 x1 h4 y30 ff3 fs1 fc0 sc0 ls1 ws1">2.1 Destino dos Fotoassimilados </div><div class="t m0 xc h4 y31 ff1 fs1 fc0 sc0 ls1 ws1"> </div><div class="t m0 xc h4 y32 ff1 fs1 fc0 sc0 ls1 ws1">A partir d<span class="blank _2"> </span>os p<span class="blank _2"> </span>rodutos intermediários d<span class="blank _2"> </span>o Ciclo de <span class="blank _2"> </span>Kalvin, são sintetizados<span class="blank _2"> </span> </div><div class="t m0 x1 h4 y33 ff1 fs1 fc0 sc0 ls1 ws1">pelas <span class="blank _9"> </span>plantas <span class="blank _9"> </span>os <span class="blank _5"> </span>diferentes <span class="blank _9"> </span>compostos <span class="blank _9"> </span>org<span class="blank _2"> </span>ânicos, <span class="blank _9"> </span>cuja <span class="blank _9"> </span>composição <span class="blank _9"> </span>depende <span class="blank _9"> </span>da </div><div class="t m0 x1 h4 y34 ff1 fs1 fc0 sc0 ls1 ws1">espécie. <span class="blank _17"> </span>As <span class="blank _17"> </span>monocotiledôneas <span class="blank _17"> </span>caracteriz<span class="blank _3"></span>am-se <span class="blank _17"> </span>pela <span class="blank _15"> </span>al<span class="blank _3"></span>ta <span class="blank _17"> </span>produção <span class="blank _10"> </span>de<span class="blank _2"> </span> <span class="blank _17"> </span>amido </div><div class="t m0 x1 h4 y35 ff1 fs1 fc0 sc0 ls1 ws1">armazenado <span class="blank _a"> </span>no<span class="blank _2"> </span>s <span class="blank _a"> </span>g<span class="blank _2"> </span>rãos <span class="blank _a"> </span>(<span class="blank _2"> </span>Trigo, <span class="blank _e"> </span>milho, <span class="blank _e"> </span>arroz, <span class="blank _a"> </span>av<span class="blank _2"> </span>eia, <span class="blank _a"> </span>ce<span class="blank _2"> </span>vada, <span class="blank _a"> </span>centeio, <span class="blank _e"> </span>triticale, </div><div class="t m0 x1 h4 y36 ff1 fs1 fc0 sc0 ls1 ws1">painço, <span class="blank _1"> </span>sorgo, <span class="blank _1"> </span>a<span class="blank _2"> </span>lpiste) <span class="blank _5"> </span>o<span class="blank _2"> </span>u <span class="blank _1"> </span>de <span class="blank _1"> </span>sacarose <span class="blank _0"> </span>armazenada <span class="blank _1"> </span>nos <span class="blank _5"> </span>co<span class="blank _2"> </span>lmos <span class="blank _1"> </span>(cana <span class="blank _1"> </span>e <span class="blank _1"> </span>so<span class="blank _2"> </span>rgo </div><div class="t m0 x1 h4 y37 ff1 fs1 fc0 sc0 ls1 ws1">sacarino). <span class="blank _10"> </span>Nas <span class="blank _10"> </span>dicotiledô<span class="blank _2"> </span>neas <span class="blank _10"> </span>predo<span class="blank _2"> </span>min<span class="blank _3"></span>am <span class="blank _10"> </span>as <span class="blank _10"> </span>r<span class="blank _2"> </span>eservas <span class="blank _10"> </span>de <span class="blank _10"> </span>proteínas <span class="blank _17"> </span>e <span class="blank _10"> </span>óleos </div><div class="t m0 x1 h4 y38 ff1 fs1 fc0 sc0 ls1 ws1">como <span class="blank _1"> </span>p<span class="blank _2"> </span>rodutos <span class="blank _1"> </span>de<span class="blank _2"> </span> <span class="blank _1"> </span>reserva. <span class="blank _0"> </span>Os <span class="blank _0"> </span>principais <span class="blank _1"> </span>produtos <span class="blank _0"> </span>resultantes <span class="blank _1"> </span>da <span class="blank _0"> </span>fotossíntese </div><div class="t m0 x1 h4 y39 ff1 fs1 fc0 sc0 ls1 ws1">são: </div><div class="t m0 x1 h4 y3a ff2 fs1 fc0 sc0 ls1 ws3">-<span class="ff5 ls2 ws1"> <span class="ff1 ls1">Monossacarídeos: <span class="blank _0"> </span>Os <span class="blank _a"> </span>principais <span class="blank _0"> </span>monossacarídeos, <span class="blank _0"> </span>g<span class="blank _2"> </span>licose <span class="blank _0"> </span>e <span class="blank _0"> </span>fr<span class="blank _2"> </span>utose, <span class="blank _0"> </span>são </span></span></div><div class="t m0 x1 h4 y3b ff1 fs1 fc0 sc0 ls1 ws1">sintetizados através do Ciclo de Kalvin (C3) ou da PEP carboxilase (C4). </div><div class="t m0 x1 h4 y3c ff2 fs1 fc0 sc0 ls1 ws3">-<span class="ff5 ls2 ws1"> <span class="ff1 ls1">Dissacarídeos: <span class="blank"> </span>A <span class="blank"> </span>s<span class="blank _3"></span>acarose <span class="blank"> </span>é <span class="blank"> </span>u<span class="blank _3"></span>m <span class="blank"> </span>i<span class="blank _3"></span>mportante <span class="blank"> </span>dissa<span class="blank _3"></span>carídeo <span class="blank"> </span>nas <span class="blank _f"> </span>plantas </span></span></div><div class="t m0 x1 h4 y3d ff1 fs1 fc0 sc0 ls1 ws1">cultivadas <span class="blank _5"> </span>(fru<span class="blank _2"> </span>tose+glicose) <span class="blank _5"> </span>envolvida <span class="blank _5"> </span>no <span class="blank _5"> </span>tr<span class="blank _2"> </span>ansporte <span class="blank _5"> </span>de <span class="blank _5"> </span>g<span class="blank _2"> </span>licídeos. <span class="blank _5"> </span>A <span class="blank _5"> </span>maltose <span class="blank _1"> </span>é </div></div><div class="pi" data-data="{"ctm":[1.000000,0.000000,0.000000,1.000000,0.000000,0.000000]}"></div></div> <div id="pf6" class="pf w0 h0" data-page-no="6"><div class="pc pc6 w0 h0"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls1 ws1">Pereira, <span class="blank _0"> </span>L.E.T. <span class="blank _0"> </span>e <span class="blank _1"> </span>Paiva<span class="blank _2"> </span>, <span class="blank _0"> </span>A.J. <span class="blank _0"> </span>O <span class="blank _1"> </span>ma<span class="blank _2"> </span>nejo <span class="blank _0"> </span>de <span class="blank _1"> </span>pas<span class="blank _2"> </span>tagens <span class="blank _0"> </span>e <span class="blank _1"> </span>as<span class="blank _2"> </span> <span class="blank _1"> </span>re<span class="blank _2"> </span>lações <span class="blank _0"> </span>fonte/dren<span class="blank _2"> </span>o <span class="blank _0"> </span>na <span class="blank _1"> </span>planta<span class="blank _2"> </span> </div><div class="t m0 x1 h2 y2 ff1 fs0 fc0 sc0 ls1 ws1">forrageira. PU<span class="blank _2"> </span>BVET, V.2, N.22, <span class="blank _2"> </span>Art#244, <span class="blank _2"> </span>Jun1, 2008<span class="blank _2"> </span>.<span class="ff2 fs1"> </span></div><div class="t m0 x2 h3 y3 ff2 fs1 fc0 sc0 ls1 ws1"> </div><div class="t m0 x1 h4 y1f ff1 fs1 fc0 sc0 ls1 ws1">outro <span class="blank _a"> </span>dissacarídeo, <span class="blank _a"> </span>ob<span class="blank _2"> </span>tido <span class="blank _a"> </span>pela <span class="blank _a"> </span>degradação <span class="blank _a"> </span>do<span class="blank _2"> </span> <span class="blank _a"> </span>amido <span class="blank _a"> </span>de <span class="blank _a"> </span>reserva <span class="blank _e"> </span>do <span class="blank _a"> </span>grão <span class="blank _a"> </span>de </div><div class="t m0 x1 h4 y20 ff1 fs1 fc0 sc0 ls1 ws1">cevada, utilizando como substrato para <span class="ff4">Sacharomyces cerevisae</span>. </div><div class="t m0 x1 h4 y21 ff2 fs1 fc0 sc0 ls1 ws3">-<span class="ff5 ls2 ws1"> <span class="ff1 ls1">Polissacarídeos: <span class="blank"> </span>C<span class="blank _3"></span>onsis<span class="blank _3"></span>tem <span class="blank _f"> </span>em <span class="blank _15"> </span>cad<span class="blank _2"> </span>eias <span class="blank _f"> </span>de <span class="blank _15"> </span>mo<span class="blank _2"> </span>nossacarídeos <span class="blank _15"> </span>sendo<span class="blank _2"> </span> <span class="blank _15"> </span>os </span></span></div><div class="t m0 x1 h4 y22 ff1 fs1 fc0 sc0 ls1 ws1">mais importantes em células vegetais o amido e a celulose. </div><div class="t m0 x1 h4 y23 ff2 fs1 fc0 sc0 ls1 ws3">-<span class="ff5 ls2 ws1"> <span class="ff1 ls1">Proteínas: <span class="blank _15"> </span>Parte <span class="blank _17"> </span>das <span class="blank _17"> </span>trioses, <span class="blank _15"> </span>pentoses <span class="blank _17"> </span>e<span class="blank _2"> </span> <span class="blank _15"> </span>hexoses <span class="blank _17"> </span>formadas <span class="blank _17"> </span>durante <span class="blank _15"> </span>a </span></span></div><div class="t m0 x1 h4 y24 ff1 fs1 fc0 sc0 ls1 ws1">fotossíntese é <span class="blank _2"> </span>convertida <span class="blank _2"> </span>em <span class="blank _2"> </span><span class="ff6 ws3">\u03b1</span>-cetoácidos <span class="blank _2"> </span>e estes, <span class="blank _2"> </span>combinando-<span class="blank _2"> </span>se com <span class="blank _2"> </span>amônia </div><div class="t m0 x1 h4 y3e ff1 fs1 fc0 sc0 ls1 ws1">ou <span class="blank _10"> </span>enxofre<span class="blank _2"> </span> <span class="blank _10"> </span>formam <span class="blank _10"> </span>os <span class="blank _17"> </span>aminoácidos. <span class="blank _10"> </span>Esses <span class="blank _10"> </span>a<span class="blank _2"> </span>minoácidos <span class="blank _10"> </span>são <span class="blank _17"> </span>convertidos <span class="blank _10"> </span>e<span class="blank _2"> </span>m </div><div class="t m0 x1 h4 y3f ff1 fs1 fc0 sc0 ls1 ws1">proteínas <span class="blank _7"> </span>ve<span class="blank _2"> </span>getais, <span class="blank _7"> </span>com <span class="blank _8"> </span>funções <span class="blank _7"> </span>estruturais, <span class="blank _7"> </span>f<span class="blank _2"> </span>uncionais <span class="blank _7"> </span>(<span class="blank _2"> </span>enzimas) <span class="blank _7"> </span>ou <span class="blank _8"> </span>de </div><div class="t m0 x1 h4 y40 ff1 fs1 fc0 sc0 ls1 ws1">reserva <span class="blank _6"> </span>(grãos <span class="blank _16"> </span>de <span class="blank _16"> </span>aleurona)<span class="blank _2"> </span>. <span class="blank _16"> </span>As <span class="blank _6"> </span>sementes <span class="blank _16"> </span>co<span class="blank _2"> </span>ntém <span class="blank _16"> </span>grande <span class="blank _6"> </span>quantidade <span class="blank _16"> </span>de </div><div class="t m0 x1 h4 y41 ff1 fs1 fc0 sc0 ls1 ws1">proteínas de reserva, como albuminas, globulinas e prolaminas. </div><div class="t m0 x1 h4 y42 ff2 fs1 fc0 sc0 ls1 ws3">-<span class="ff5 ls2 ws1"> <span class="ff1 ls1">Lipídios: <span class="blank _11"> </span>Fosfolipídeo<span class="blank _2"> </span>s <span class="blank _11"> </span>(<span class="blank _2"> </span>constituinte <span class="blank _11"> </span>d<span class="blank _2"> </span>e <span class="blank _d"> </span>membranas), <span class="blank _11"> </span>esfingolipíde<span class="blank _2"> </span>os, </span></span></div><div class="t m0 x1 h4 y43 ff1 fs1 fc0 sc0 ls1 ws1">cerídeos, cutina e suberina são alguns lipídeos produzidos nas plantas. </div><div class="t m0 x1 h4 y44 ff2 fs1 fc0 sc0 ls1 ws3">-<span class="ff5 ls2 ws1"> <span class="ff1 ls1">Compostos <span class="blank _1a"> </span>secundários: <span class="blank _1a"> </span>além <span class="blank _1a"> </span>do <span class="blank _1a"> </span>metabolismo <span class="blank _1a"> </span>primário, <span class="blank _1a"> </span>os </span></span></div><div class="t m0 x1 h4 y45 ff1 fs1 fc0 sc0 ls1 ws1">fotoassimilados <span class="blank _c"> </span>também <span class="blank _c"> </span>são <span class="blank _c"> </span>convertidos <span class="blank _c"> </span>em <span class="blank _c"> </span>outros <span class="blank _c"> </span>compostos <span class="blank _1b"> </span>pelo </div><div class="t m0 x1 h4 y46 ff1 fs1 fc0 sc0 ls1 ws1">metabolismo <span class="blank _9"> </span>secund<span class="blank _2"> </span>ário. <span class="blank _5"> </span>A <span class="blank _9"> </span>natureza <span class="blank _9"> </span>d<span class="blank _2"> </span>esses <span class="blank _5"> </span>compostos <span class="blank _5"> </span>depende <span class="blank _9"> </span>do <span class="blank _5"> </span>fenótipo <span class="blank _9"> </span>e </div><div class="t m0 x1 h4 y47 ff1 fs1 fc0 sc0 ls1 ws1">das <span class="blank _e"> </span>condições <span class="blank _e"> </span>de <span class="blank _e"> </span>solo <span class="blank _e"> </span>e <span class="blank _10"> </span>clima <span class="blank _a"> </span>d<span class="blank _2"> </span>o <span class="blank _e"> </span>local <span class="blank _e"> </span>de <span class="blank _e"> </span>cultivo. <span class="blank _e"> </span>Também <span class="blank _e"> </span>são <span class="blank _10"> </span>diversas <span class="blank _e"> </span>as </div><div class="t m0 x1 h4 y48 ff1 fs1 fc0 sc0 ls1 ws1">funções <span class="blank _18"> </span>desses <span class="blank _19"> </span>compostos, <span class="blank _18"> </span>como <span class="blank _18"> </span>estruturais, <span class="blank _18"> </span>pigmentos, <span class="blank _18"> </span>hormônios <span class="blank _19"> </span>e </div><div class="t m0 x1 h4 y49 ff1 fs1 fc0 sc0 ls1 ws1">compostos <span class="blank _9"> </span>que<span class="blank _2"> </span> <span class="blank _9"> </span>protegem <span class="blank _9"> </span>as <span class="blank _9"> </span>p<span class="blank _2"> </span>lantas <span class="blank _9"> </span>de <span class="blank _5"> </span>predadores <span class="blank _9"> </span>e <span class="blank _5"> </span>patógenos, <span class="blank _9"> </span>com <span class="blank _9"> </span>b<span class="blank _2"> </span>ase <span class="blank _9"> </span>na </div><div class="t m0 x1 h4 y4a ff1 fs1 fc0 sc0 ls1 ws1">sua <span class="blank _0"> </span>toxi<span class="blank _2"> </span>cidade <span class="blank _a"> </span>e <span class="blank _a"> </span>na <span class="blank _0"> </span>cap<span class="blank _2"> </span>acidade <span class="blank _a"> </span>de <span class="blank _a"> </span>repelir <span class="blank _a"> </span>herbívoros <span class="blank _0"> </span>e<span class="blank _2"> </span> <span class="blank _a"> </span>microorganismos. <span class="blank _a"> </span>D<span class="blank _3"></span>e </div><div class="t m0 x1 h4 y4b ff1 fs1 fc0 sc0 ls1 ws1">maneira <span class="blank _6"> </span>g<span class="blank _2"> </span>eral, <span class="blank _4"> </span>os <span class="blank _4"> </span>compostos <span class="blank _4"> </span>secundários <span class="blank _4"> </span>são <span class="blank _6"> </span>d<span class="blank _2"> </span>ivididos <span class="blank _6"> </span>em <span class="blank _4"> </span>três <span class="blank _4"> </span>grandes </div><div class="t m0 x1 h4 y4c ff1 fs1 fc0 sc0 ls1 ws1">grupos: <span class="blank _0"> </span>(i) <span class="blank _0"> </span>terpen<span class="blank _2"> </span>os <span class="blank _0"> </span>ou <span class="blank _0"> </span>terpe<span class="blank _2"> </span>nóides; <span class="blank _0"> </span>(ii) <span class="blank _0"> </span>fenóis <span class="blank _0"> </span>e <span class="blank _0"> </span>(iii) <span class="blank _0"> </span>co<span class="blank _2"> </span>mpostos <span class="blank _0"> </span>secundários </div><div class="t m0 x1 h4 y4d ff1 fs1 fc0 sc0 ls1 ws1">nitrogenados. </div><div class="t m0 xc h4 y4e ff1 fs1 fc0 sc0 ls1 ws1"> </div><div class="t m0 xb h4 y4f ff3 fs1 fc0 sc0 ls1 ws1">3. Os processos e rotas da partição de assimilados </div><div class="t m0 x1 h4 y50 ff1 fs1 fc0 sc0 ls1 ws1"> </div><div class="t m0 x1 h4 y51 ff3 fs1 fc0 sc0 ls1 ws1">3.1 Transporte no floema </div><div class="t m0 x1 h4 y52 ff1 fs1 fc0 sc0 ls1 ws1"> </div><div class="t m0 xa h4 y53 ff1 fs1 fc0 sc0 ls1 ws1">O <span class="blank _d"> </span>acúmulo <span class="blank _d"> </span>de <span class="blank _d"> </span>matéria <span class="blank _d"> </span>seca <span class="blank _d"> </span>no <span class="blank _d"> </span>órg<span class="blank _2"> </span>ão <span class="blank _d"> </span>de <span class="blank _d"> </span>interesse <span class="blank _d"> </span>econômico <span class="blank _11"> </span>é<span class="blank _2"> </span> </div><div class="t m0 x1 h4 y54 ff1 fs1 fc0 sc0 ls1 ws1">controlado <span class="blank _d"> </span>pela <span class="blank _d"> </span>troca <span class="blank _d"> </span>de <span class="blank _d"> </span>metabólitos <span class="blank _d"> </span>entre <span class="blank _11"> </span>o<span class="blank _2"> </span>s <span class="blank _d"> </span>tecidos <span class="blank _d"> </span>fornecedores <span class="blank _11"> </span>d<span class="blank _2"> </span>e </div><div class="t m0 x1 h4 y55 ff1 fs1 fc0 sc0 ls1 ws1">fotoassimilados <span class="blank _a"> </span>(<span class="blank _2"> </span>a <span class="blank _a"> </span>fon<span class="blank _2"> </span>te) <span class="blank _e"> </span>e <span class="blank _e"> </span>o <span class="blank _e"> </span>órgão <span class="blank _a"> </span>colhido <span class="blank _e"> </span>(o <span class="blank _a"> </span>dr<span class="blank _2"> </span>eno <span class="blank _e"> </span>colh<span class="blank _3"></span>ido). <span class="blank _e"> </span>Portanto, <span class="blank _a"> </span>sã<span class="blank _2"> </span>o </div><div class="t m0 x1 h4 y56 ff1 fs1 fc0 sc0 ls1 ws1">considerados <span class="blank _1c"> </span><span class="ff3 ws4">fontes</span> <span class="blank _1c"> </span>os <span class="blank _1c"> </span>ó<span class="blank _2"> </span>rgãos <span class="blank _1c"> </span>ou <span class="blank _18"> </span>tecidos <span class="blank _1c"> </span>que <span class="blank _1c"> </span>exportam <span class="blank _1c"> </span>assimilados, </div></div><div class="pi" data-data="{"ctm":[1.000000,0.000000,0.000000,1.000000,0.000000,0.000000]}"></div></div> <div id="pf7" class="pf w0 h0" data-page-no="7"><div class="pc pc7 w0 h0"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls1 ws1">Pereira, <span class="blank _0"> </span>L.E.T. <span class="blank _0"> </span>e <span class="blank _1"> </span>Paiva<span class="blank _2"> </span>, <span class="blank _0"> </span>A.J. <span class="blank _0"> </span>O <span class="blank _1"> </span>ma<span class="blank _2"> </span>nejo <span class="blank _0"> </span>de <span class="blank _1"> </span>pas<span class="blank _2"> </span>tagens <span class="blank _0"> </span>e <span class="blank _1"> </span>as<span class="blank _2"> </span> <span class="blank _1"> </span>re<span class="blank _2"> </span>lações <span class="blank _0"> </span>fonte/dren<span class="blank _2"> </span>o <span class="blank _0"> </span>na <span class="blank _1"> </span>planta<span class="blank _2"> </span> </div><div class="t m0 x1 h2 y2 ff1 fs0 fc0 sc0 ls1 ws1">forrageira. PU<span class="blank _2"> </span>BVET, V.2, N.22, <span class="blank _2"> </span>Art#244, <span class="blank _2"> </span>Jun1, 2008<span class="blank _2"> </span>.<span class="ff2 fs1"> </span></div><div class="t m0 x2 h3 y3 ff2 fs1 fc0 sc0 ls1 ws1"> </div><div class="t m0 x1 h4 y1f ff1 fs1 fc0 sc0 ls1 ws1">sintetizando-os <span class="blank _5"> </span>(<span class="blank _2"> </span>tecidos <span class="blank _5"> </span>verd<span class="blank _2"> </span>es), <span class="blank _5"> </span>ou <span class="blank _1"> </span>estocando-os <span class="blank _1"> </span>anteriormente <span class="blank _1"> </span>(como <span class="blank _1"> </span>dreno </div><div class="t m0 x1 h4 y20 ff1 fs1 fc0 sc0 ls1 ws1">reversível) <span class="blank"> </span>e <span class="blank"> </span>ce<span class="blank _3"></span>dendo-os <span class="blank"> </span>posteriormente. <span class="blank _15"> </span>J<span class="blank _2"> </span>á <span class="blank"> </span>os <span class="blank _15"> </span><span class="ff3 ws5">dr<span class="blank _2"> </span>enos</span> <span class="blank"> </span>sã<span class="blank _3"></span>o <span class="blank"> </span>os <span class="blank"> </span>ór<span class="blank _3"></span>gãos <span class="blank"> </span>ou </div><div class="t m0 x1 h4 y21 ff1 fs1 fc0 sc0 ls1 ws1">tecidos <span class="blank _0"> </span>que <span class="blank _0"> </span>utilizam <span class="blank _0"> </span>(drenos <span class="blank _0"> </span>em <span class="blank _0"> </span>crescimento) <span class="blank _0"> </span>ou <span class="blank _0"> </span>armazenam <span class="blank _0"> </span>fotoassimilados </div><div class="t m0 x1 h4 y22 ff1 fs1 fc0 sc0 ls1 ws1">(drenos <span class="blank _0"> </span>de <span class="blank _0"> </span>reserva) <span class="blank _0"> </span>(Pimentel, <span class="blank _1"> </span>19<span class="blank _2"> </span>98; <span class="blank _0"> </span>Marenco <span class="blank _0"> </span>& <span class="blank _0"> </span>Lopes, <span class="blank _0"> </span>2005). <span class="blank _0"> </span>Esses <span class="blank _1"> </span>d<span class="blank _2"> </span>renos </div><div class="t m0 x1 h4 y23 ff1 fs1 fc0 sc0 ls1 ws1">podem <span class="blank _5"> </span>s<span class="blank _2"> </span>er <span class="blank _1"> </span>irreversíveis <span class="blank _1"> </span>ou <span class="blank _1"> </span>permanentes, <span class="blank _5"> </span>como <span class="blank _1"> </span>o<span class="blank _2"> </span>s <span class="blank _5"> </span>mer<span class="blank _2"> </span>istemas <span class="blank _5"> </span>vegetativos <span class="blank _1"> </span>de </div><div class="t m0 x1 h4 y24 ff1 fs1 fc0 sc0 ls1 ws1">parte <span class="blank _1"> </span>aérea <span class="blank _1"> </span>ou <span class="blank _1"> </span>ra<span class="blank _2"> </span>íz; <span class="blank _1"> </span>e <span class="blank _1"> </span>reversíveis, <span class="blank _1"> </span>como <span class="blank _1"> </span>o <span class="blank _0"> </span>meristema <span class="blank _5"> </span>intercalar <span class="blank _1"> </span>de <span class="blank _0"> </span>folhas, <span class="blank _5"> </span>de </div><div class="t m0 x1 h4 y25 ff1 fs1 fc0 sc0 ls1 ws1">flores <span class="blank _4"> </span>e <span class="blank _4"> </span>de<span class="blank _2"> </span> <span class="blank _4"> </span>inflorescências, <span class="blank _4"> </span>os <span class="blank _4"> </span>entrenós <span class="blank _4"> </span>de<span class="blank _2"> </span> <span class="blank _4"> </span>cana-de-açúcar, <span class="blank _6"> </span>o<span class="blank _2"> </span> <span class="blank _4"> </span>tronco <span class="blank _4"> </span>de<span class="blank _2"> </span> </div><div class="t m0 x1 h4 y26 ff1 fs1 fc0 sc0 ls1 ws1">árvores, <span class="blank"> </span>os<span class="blank _3"></span> <span class="blank _f"> </span>tecidos <span class="blank _f"> </span>de <span class="blank _15"> </span>reserva <span class="blank"> </span>de <span class="blank _15"> </span>frutos, <span class="blank"> </span>de <span class="blank _15"> </span>sementes, <span class="blank"> </span>de <span class="blank _15"> </span>tubérculos, <span class="blank _15"> </span>de </div><div class="t m0 x1 h4 y27 ff1 fs1 fc0 sc0 ls1 ws1">bulbos e de bulbilhos (Pimentel, 1998). </div><div class="t m0 xa h4 y28 ff1 fs1 fc0 sc0 ls1 ws1">Vários <span class="blank _10"> </span>fatores <span class="blank _10"> </span>influenciam <span class="blank _10"> </span>a <span class="blank _17"> </span>alocação <span class="blank _10"> </span>e <span class="blank _10"> </span>a<span class="blank _2"> </span> <span class="blank _10"> </span>partição <span class="blank _10"> </span>d<span class="blank _2"> </span>e <span class="blank _10"> </span>assimilados <span class="blank _10"> </span>nos </div><div class="t m0 x1 h4 y29 ff1 fs1 fc0 sc0 ls1 ws1">distintos <span class="blank _e"> </span>ór<span class="blank _2"> </span>gãos <span class="blank _10"> </span>da <span class="blank _10"> </span>planta, <span class="blank _10"> </span>sendo <span class="blank _10"> </span>o<span class="blank _2"> </span>s <span class="blank _10"> </span>principais <span class="blank _10"> </span>a <span class="blank _10"> </span>atividade <span class="blank _10"> </span>fotossintética <span class="blank _10"> </span>da </div><div class="t m0 x1 h4 y2a ff1 fs1 fc0 sc0 ls1 ws1">fonte, <span class="blank _2"> </span>a <span class="blank _9"> </span>força <span class="blank _2"> </span>do <span class="blank _9"> </span>dreno <span class="blank _2"> </span>e <span class="blank _9"> </span>os <span class="blank _2"> </span>fatores <span class="blank _2"> </span>que<span class="blank _2"> </span> <span class="blank _2"> </span>afetam <span class="blank _9"> </span>o <span class="blank _2"> </span>descarregamento <span class="blank _2"> </span>no<span class="blank _2"> </span> <span class="blank _2"> </span>floema. </div><div class="t m0 x1 h4 y2b ff1 fs1 fc0 sc0 ls1 ws1">Em <span class="blank _9"> </span>espécies <span class="blank _9"> </span>q<span class="blank _2"> </span>ue <span class="blank _9"> </span>crescem <span class="blank _9"> </span>em <span class="blank _5"> </span>associaçã<span class="blank _3"></span>o, <span class="blank _9"> </span>a <span class="blank _5"> </span>partição <span class="blank _9"> </span>de <span class="blank _9"> </span>assimilados <span class="blank _9"> </span>também <span class="blank _9"> </span>é </div><div class="t m0 x1 h4 y2c ff1 fs1 fc0 sc0 ls1 ws1">influenciada <span class="blank _4"> </span>pela <span class="blank _4"> </span>co<span class="blank _2"> </span>mpetição <span class="blank _4"> </span>interespecífica <span class="blank _4"> </span>(<span class="blank _2"> </span>Marenco <span class="blank _4"> </span>& <span class="blank _7"> </span>Lopes, <span class="blank _4"> </span>20<span class="blank _2"> </span>05). <span class="blank _4"> </span>A </div><div class="t m0 x1 h4 y2d ff1 fs1 fc0 sc0 ls1 ws1">alocação <span class="blank _4"> </span>d<span class="blank _2"> </span>e <span class="blank _7"> </span>assimilados <span class="blank _4"> </span>r<span class="blank _2"> </span>efere-se <span class="blank _7"> </span>ao <span class="blank _7"> </span>destino <span class="blank _7"> </span>ou <span class="blank _7"> </span>uso <span class="blank _4"> </span>do<span class="blank _2"> </span> <span class="blank _4"> </span>carbono <span class="blank _7"> </span>fix<span class="blank _2"> </span>ado </div><div class="t m0 x1 h4 y2e ff1 fs1 fc0 sc0 ls1 ws1">(sacarose ou amido pa<span class="blank _2"> </span>ra uso na r<span class="blank _2"> </span>espiração), enquanto que a <span class="blank _2"> </span>partição refere-se </div><div class="t m0 x1 h4 y2f ff1 fs1 fc0 sc0 ls1 ws1">a distribuição diferencial<span class="blank _3"></span> dos fotoassimila<span class="blank _2"> </span>dos nos diferentes órgãos da planta. </div><div class="t m0 xa h4 y30 ff1 fs1 fc0 sc0 ls1 ws1">O <span class="blank _1c"> </span>f<span class="blank _3"></span>loema <span class="blank _1d"> </span>é <span class="blank _1d"> </span>o <span class="blank _1d"> </span>tecido <span class="blank _1d"> </span>que <span class="blank _1d"> </span>transloca <span class="blank _1d"> </span>os <span class="blank _1d"> </span>p<span class="blank _2"> </span>rodutos <span class="blank _1d"> </span>da <span class="blank _1d"> </span>fotossíntese </div><div class="t m0 x1 h4 y31 ff1 fs1 fc0 sc0 ls1 ws1">(fotoassimilados) <span class="blank _a"> </span>das <span class="blank _0"> </span>fontes <span class="blank _a"> </span>para <span class="blank _a"> </span>os <span class="blank _0"> </span>d<span class="blank _2"> </span>renos, <span class="blank _a"> </span>inclui<span class="blank _3"></span>ndo <span class="blank _a"> </span>raízes, <span class="blank _0"> </span>fol<span class="blank _2"> </span>has <span class="blank _0"> </span>no<span class="blank _2"> </span>vas <span class="blank _a"> </span>e </div><div class="t m0 x1 h4 y32 ff1 fs1 fc0 sc0 ls1 ws1">frutos em desenvolvimento. </div><div class="t m0 xc h4 y33 ff1 fs1 fc0 sc0 ls1 ws1">Em <span class="blank _15"> </span>uma <span class="blank _15"> </span>folha <span class="blank _15"> </span>fotossi<span class="blank _3"></span>nteticamente <span class="blank _15"> </span>ativa, <span class="blank _15"> </span>através <span class="blank _15"> </span>do <span class="blank _15"> </span>Cicl<span class="blank _3"></span>o <span class="blank _15"> </span>de <span class="blank _15"> </span>Kalvin </div><div class="t m0 x1 h4 y34 ff1 fs1 fc0 sc0 ls1 ws1">ocorre <span class="blank _1"> </span>a <span class="blank _5"> </span>co<span class="blank _2"> </span>nversão <span class="blank _5"> </span>da <span class="blank _1"> </span>triose <span class="blank _5"> </span>fo<span class="blank _2"> </span>sfato <span class="blank _5"> </span>em <span class="blank _1"> </span>glicose, <span class="blank _1"> </span>por <span class="blank _5"> </span>enzimas <span class="blank _1"> </span>reguladoras. <span class="blank _1"> </span>No </div><div class="t m0 x1 h4 y35 ff1 fs1 fc0 sc0 ls1 ws1">citosol, <span class="blank _2"> </span>as <span class="blank _5"> </span>enzimas <span class="blank _9"> </span>de <span class="blank _9"> </span>síntese <span class="blank _2"> </span>de<span class="blank _2"> </span> <span class="blank _9"> </span>sacarose <span class="blank _9"> </span>combinam <span class="blank _2"> </span>uma <span class="blank _9"> </span>molé<span class="blank _2"> </span>cula <span class="blank _9"> </span>de <span class="blank _9"> </span>glicose </div><div class="t m0 x1 h4 y36 ff1 fs1 fc0 sc0 ls1 ws1">a <span class="blank _0"> </span>uma <span class="blank _1"> </span>de<span class="blank _2"> </span> <span class="blank _0"> </span>frutose <span class="blank _0"> </span>(um<span class="blank _3"></span> <span class="blank _0"> </span>intermediário <span class="blank _0"> </span>da <span class="blank _0"> </span>síntese <span class="blank _0"> </span>de <span class="blank _0"> </span>glicose). <span class="blank _1"> </span>A <span class="blank _0"> </span>sacarose <span class="blank _0"> </span>é <span class="blank _0"> </span>um </div><div class="t m0 x1 h4 y37 ff1 fs1 fc0 sc0 ls1 ws1">importante <span class="blank _1"> </span>composto <span class="blank _1"> </span>na <span class="blank _1"> </span>p<span class="blank _2"> </span>artição <span class="blank _5"> </span>e <span class="blank _0"> </span>transporte <span class="blank _5"> </span>de <span class="blank _0"> </span>assimi<span class="blank _3"></span>lados. <span class="blank _1"> </span>Várias <span class="blank _1"> </span>plantas, </div><div class="t m0 x1 h4 y38 ff1 fs1 fc0 sc0 ls1 ws1">inclusive <span class="blank _a"> </span>a <span class="blank _e"> </span>maioria <span class="blank _a"> </span>dos <span class="blank _a"> </span>cereais <span class="blank _e"> </span>tem <span class="blank _a"> </span>capacidade <span class="blank _a"> </span>para <span class="blank _a"> </span>a<span class="blank _2"> </span>rmazen<span class="blank _3"></span>ar <span class="blank _a"> </span>sacarose <span class="blank _e"> </span>no </div><div class="t m0 x1 h4 y39 ff1 fs1 fc0 sc0 ls1 ws1">vacúolo das células foliares. </div><div class="t m0 xc h4 y3a ff1 fs1 fc0 sc0 ls1 ws1">Sob <span class="blank _4"> </span>condições <span class="blank _6"> </span>onde <span class="blank _4"> </span>a <span class="blank _6"> </span>co<span class="blank _2"> </span>ncentração <span class="blank _4"> </span>de <span class="blank _6"> </span>sacarose <span class="blank _4"> </span>na <span class="blank _6"> </span>folha <span class="blank _6"> </span>é <span class="blank _4"> </span>alta, </div><div class="t m0 x1 h4 y3b ff1 fs1 fc0 sc0 ls1 ws1">pastagens <span class="blank _7"> </span>temperadas <span class="blank _7"> </span>e <span class="blank _7"> </span>espécie<span class="blank _2"> </span>s <span class="blank _7"> </span>de <span class="blank _7"> </span>cereais <span class="blank _7"> </span>podem <span class="blank _7"> </span>também <span class="blank _7"> </span>armazenar </div><div class="t m0 x1 h4 y3c ff1 fs1 fc0 sc0 ls1 ws1">frutanas <span class="blank _f"> </span>solúveis <span class="blank"> </span>(polím<span class="blank _3"></span>eros <span class="blank"> </span>curtos <span class="blank _f"> </span>de <span class="blank"> </span>frut<span class="blank _3"></span>ose) <span class="blank"> </span>no <span class="blank _15"> </span>v<span class="blank _2"> </span>acúolo <span class="blank _f"> </span>das <span class="blank"> </span>cél<span class="blank _3"></span>ulas <span class="blank"> </span>do </div><div class="t m0 x1 h4 y3d ff1 fs1 fc0 sc0 ls1 ws1">mesófilo. <span class="blank _1"> </span>Contudo, <span class="blank _1"> </span>dentro <span class="blank _1"> </span>do <span class="blank _0"> </span>cloroplasto <span class="blank _5"> </span>a <span class="blank _0"> </span>frutose <span class="blank _5"> </span>é <span class="blank _0"> </span>conv<span class="blank _3"></span>ertida <span class="blank _1"> </span>em <span class="blank _1"> </span>glicose, <span class="blank _1"> </span>a </div></div><div class="pi" data-data="{"ctm":[1.000000,0.000000,0.000000,1.000000,0.000000,0.000000]}"></div></div> <div id="pf8" class="pf w0 h0" data-page-no="8"><div class="pc pc8 w0 h0"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls1 ws1">Pereira, <span class="blank _0"> </span>L.E.T. <span class="blank _0"> </span>e <span class="blank _1"> </span>Paiva<span class="blank _2"> </span>, <span class="blank _0"> </span>A.J. <span class="blank _0"> </span>O <span class="blank _1"> </span>ma<span class="blank _2"> </span>nejo <span class="blank _0"> </span>de <span class="blank _1"> </span>pas<span class="blank _2"> </span>tagens <span class="blank _0"> </span>e <span class="blank _1"> </span>as<span class="blank _2"> </span> <span class="blank _1"> </span>re<span class="blank _2"> </span>lações <span class="blank _0"> </span>fonte/dren<span class="blank _2"> </span>o <span class="blank _0"> </span>na <span class="blank _1"> </span>planta<span class="blank _2"> </span> </div><div class="t m0 x1 h2 y2 ff1 fs0 fc0 sc0 ls1 ws1">forrageira. PU<span class="blank _2"> </span>BVET, V.2, N.22, <span class="blank _2"> </span>Art#244, <span class="blank _2"> </span>Jun1, 2008<span class="blank _2"> </span>.<span class="ff2 fs1"> </span></div><div class="t m0 x2 h3 y3 ff2 fs1 fc0 sc0 ls1 ws1"> </div><div class="t m0 x1 h4 y1f ff1 fs1 fc0 sc0 ls1 ws1">qual <span class="blank _1"> </span>é <span class="blank _0"> </span>polimerizada <span class="blank _1"> </span>p<span class="blank _2"> </span>ara <span class="blank _0"> </span>dar <span class="blank _1"> </span>amido<span class="blank _2"> </span> <span class="blank _1"> </span>insolúvel. <span class="blank _1"> </span>Estes <span class="blank _0"> </span>componentes <span class="blank _0"> </span>do <span class="blank _0"> </span>sistema </div><div class="t m0 x1 h4 y20 ff1 fs1 fc0 sc0 ls1 ws1">mantém <span class="blank _15"> </span>o <span class="blank _15"> </span>nível <span class="blank _15"> </span>d<span class="blank _2"> </span>e <span class="blank _f"> </span>sacarose <span class="blank _15"> </span>no <span class="blank _15"> </span>citosol <span class="blank _15"> </span>d<span class="blank _2"> </span>as <span class="blank _15"> </span>células <span class="blank _15"> </span>foliares, <span class="blank _f"> </span>pela <span class="blank _15"> </span>troca <span class="blank _15"> </span>de </div><div class="t m0 x1 h4 y21 ff1 fs1 fc0 sc0 ls1 ws1">sacarose <span class="blank _2"> </span>e <span class="blank _9"> </span>ou <span class="blank _2"> </span>fr<span class="blank _2"> </span>utanas <span class="blank _2"> </span>no <span class="blank _2"> </span>v<span class="blank _2"> </span>acúolo, <span class="blank _2"> </span>e <span class="blank _9"> </span>por <span class="blank _9"> </span>mobilização <span class="blank _2"> </span>e <span class="blank _2"> </span>dep<span class="blank _2"> </span>osição <span class="blank _2"> </span>de <span class="blank _9"> </span>amido <span class="blank _2"> </span>no </div><div class="t m0 x1 h4 y22 ff1 fs1 fc0 sc0 ls1 ws1">cloroplasto. </div><div class="t m0 xc h4 y23 ff1 fs1 fc0 sc0 ls1 ws1">Durante <span class="blank _15"> </span>períodos <span class="blank _15"> </span>de <span class="blank _17"> </span>rápida <span class="blank _15"> </span>fotossíntese, <span class="blank _17"> </span>as <span class="blank _15"> </span>reservas <span class="blank _15"> </span>de <span class="blank _17"> </span>sacarose <span class="blank _15"> </span>e </div><div class="t m0 x1 h4 y24 ff1 fs1 fc0 sc0 ls1 ws1">amido <span class="blank _10"> </span>podem <span class="blank _10"> </span>ser <span class="blank _10"> </span>pr<span class="blank _2"> </span>eenchidas. <span class="blank _e"> </span>Contudo<span class="blank _2"> </span>, <span class="blank _10"> </span>no <span class="blank _10"> </span>escuro <span class="blank _10"> </span>ou <span class="blank _10"> </span>intensa <span class="blank _10"> </span>demanda <span class="blank _10"> </span>de </div><div class="t m0 x1 h4 y25 ff1 fs1 fc0 sc0 ls1 ws1">assimilados <span class="blank _5"> </span>(para <span class="blank _5"> </span>o <span class="blank _5"> </span>local <span class="blank _5"> </span>de <span class="blank _1"> </span>uso <span class="blank _5"> </span>ou <span class="blank _5"> </span>transporte <span class="blank _5"> </span>p<span class="blank _2"> </span>ara <span class="blank _5"> </span>reservatórios <span class="blank _9"> </span>d<span class="blank _2"> </span>istantes) <span class="blank _5"> </span>a </div><div class="t m0 x1 h4 y26 ff1 fs1 fc0 sc0 ls1 ws1">sacarose <span class="blank _a"> </span>vacuolar <span class="blank _0"> </span>p<span class="blank _2"> </span>ode <span class="blank _a"> </span>ser <span class="blank _0"> </span>mobilizada <span class="blank _a"> </span>rapidamente. <span class="blank _a"> </span>A <span class="blank _0"> </span>sub<span class="blank _2"> </span>seqüente <span class="blank _a"> </span>hidrólise </div><div class="t m0 x1 h4 y27 ff1 fs1 fc0 sc0 ls1 ws1">do <span class="blank _17"> </span>amido <span class="blank _10"> </span>e <span class="blank _17"> </span>o <span class="blank _10"> </span>transporte <span class="blank _10"> </span>d<span class="blank _2"> </span>o <span class="blank _10"> </span>fo<span class="blank _2"> </span>sforilato <span class="blank _10"> </span>intermediário <span class="blank _17"> </span>resul<span class="blank _3"></span>tante <span class="blank _17"> </span>atravessa <span class="blank _10"> </span>a </div><div class="t m0 x1 h4 y28 ff1 fs1 fc0 sc0 ls1 ws1">membrana <span class="blank _e"> </span>do <span class="blank _a"> </span>cloroplasto <span class="blank _e"> </span>e <span class="blank _a"> </span>p<span class="blank _2"> </span>ode <span class="blank _a"> </span>p<span class="blank _2"> </span>rover <span class="blank _e"> </span>a <span class="blank _a"> </span>dema<span class="blank _2"> </span>nda <span class="blank _a"> </span>p<span class="blank _2"> </span>or <span class="blank _a"> </span>períodos <span class="blank _a"> </span>de <span class="blank _e"> </span>escuro </div><div class="t m0 x1 h4 y29 ff1 fs1 fc0 sc0 ls1 ws1">prolongados. </div><div class="t m0 xc h4 y2a ff1 fs1 fc0 sc0 ls1 ws1">Os <span class="blank _0"> </span>níveis <span class="blank _0"> </span>de <span class="blank _a"> </span>sacarose <span class="blank _1"> </span>n<span class="blank _2"> </span>o <span class="blank _0"> </span>citosol <span class="blank _0"> </span>são <span class="blank _0"> </span>mantidos <span class="blank _0"> </span>b<span class="blank _2"> </span>aixos <span class="blank _0"> </span>por <span class="blank _0"> </span>hidrólise <span class="blank _0"> </span>da </div><div class="t m0 x1 h4 y2b ff1 fs1 fc0 sc0 ls1 ws1">glicose <span class="blank _1"> </span>e<span class="blank _2"> </span> <span class="blank _1"> </span>frutose, <span class="blank _0"> </span>e <span class="blank _1"> </span>pela <span class="blank _0"> </span>incorporação <span class="blank _5"> </span>d<span class="blank _2"> </span>os <span class="blank _0"> </span>açucares <span class="blank _1"> </span>resultantes, <span class="blank _5"> </span>no<span class="blank _2"> </span>rmalmente </div><div class="t m0 x1 h4 y2c ff1 fs1 fc0 sc0 ls1 ws1">amido, <span class="blank _9"> </span>armazenados <span class="blank _5"> </span>nos <span class="blank _5"> </span>plastídeos. <span class="blank _5"> </span>Os <span class="blank _9"> </span>difere<span class="blank _2"> </span>ntes <span class="blank _9"> </span>r<span class="blank _2"> </span>esultados <span class="blank _5"> </span>da <span class="blank _9"> </span>concentração </div><div class="t m0 x1 h4 y2d ff1 fs1 fc0 sc0 ls1 ws1">de <span class="blank _2"> </span>sacarose<span class="blank _2"> </span> g<span class="blank _2"> </span>eram <span class="blank _2"> </span>uma <span class="blank _2"> </span>p<span class="blank _2"> </span>ressão <span class="blank _2"> </span>de <span class="blank _9"> </span>turgor <span class="blank _2"> </span>no <span class="blank _2"> </span>lúmen <span class="blank _2"> </span>d<span class="blank _2"> </span>os <span class="blank _2"> </span>elementos <span class="blank _2"> </span>do <span class="blank _2"> </span>floem<span class="blank _2"> </span>a, </div><div class="t m0 x1 h4 y2e ff1 fs1 fc0 sc0 ls1 ws1">promovendo <span class="blank _1"> </span>uma <span class="blank _1"> </span>força <span class="blank _1"> </span>q<span class="blank _2"> </span>ue <span class="blank _1"> </span>dirige, <span class="blank _1"> </span>por <span class="blank _1"> </span>fluxo <span class="blank _1"> </span>de<span class="blank _2"> </span> <span class="blank _1"> </span>massa, <span class="blank _1"> </span>a <span class="blank _1"> </span>sacarose <span class="blank _1"> </span>de<span class="blank _2"> </span> <span class="blank _5"> </span>órg<span class="blank _2"> </span>ãos </div><div class="t m0 x1 h4 y2f ff1 fs1 fc0 sc0 ls1 ws1">fonte <span class="blank _2"> </span>pa<span class="blank _2"> </span>ra <span class="blank _2"> </span>os <span class="blank _9"> </span>drenos.<span class="blank _3"></span> <span class="blank _2"> </span>Os <span class="blank _9"> </span>assimilados <span class="blank _2"> </span>são <span class="blank _9"> </span>também <span class="blank _2"> </span>transportados <span class="blank _9"> </span>e <span class="blank _2"> </span>depositados </div><div class="t m0 x1 h4 y30 ff1 fs1 fc0 sc0 ls1 ws1">em <span class="blank _a"> </span>outros <span class="blank _e"> </span>sítios <span class="blank _a"> </span>de <span class="blank _a"> </span>reserva <span class="blank _e"> </span>na <span class="blank _a"> </span>planta, <span class="blank _a"> </span>estes <span class="blank _a"> </span>incluem <span class="blank _a"> </span>pequenas <span class="blank _a"> </span>reservas <span class="blank _a"> </span>e<span class="blank _2"> </span>m </div><div class="t m0 x1 h4 y31 ff1 fs1 fc0 sc0 ls1 ws1">todos <span class="blank _15"> </span>o<span class="blank _2"> </span>s <span class="blank _15"> </span>meristemas <span class="blank _15"> </span>ativos <span class="blank _15"> </span>e <span class="blank _f"> </span>grandes <span class="blank _15"> </span>reservas <span class="blank _15"> </span>no<span class="blank _2"> </span>s <span class="blank _15"> </span>colmos <span class="blank _15"> </span>e <span class="blank _15"> </span>tamb<span class="blank _2"> </span>ém <span class="blank _15"> </span>na </div><div class="t m0 x1 h4 y32 ff1 fs1 fc0 sc0 ls1 ws1">bainha <span class="blank _17"> </span>das <span class="blank _17"> </span>folhas, <span class="blank _17"> </span>raízes <span class="blank _17"> </span>e <span class="blank _17"> </span>estrutura<span class="blank _2"> </span>s <span class="blank _17"> </span>reprodutivas, <span class="blank _17"> </span>como <span class="blank _17"> </span>nas <span class="blank _17"> </span>pared<span class="blank _2"> </span>es <span class="blank _17"> </span>das </div><div class="t m0 x1 h4 y33 ff1 fs1 fc0 sc0 ls1 ws1">vagens <span class="blank _1c"> </span>em <span class="blank _1c"> </span>leg<span class="blank _2"> </span>umes. <span class="blank _1c"> </span>Nestes <span class="blank _1c"> </span>sítios <span class="blank _1c"> </span>de <span class="blank _18"> </span>curto-prazo, <span class="blank _1c"> </span>as <span class="blank _1c"> </span>reservas <span class="blank _1c"> </span>estão </div><div class="t m0 x1 h4 y34 ff1 fs1 fc0 sc0 ls1 ws1">normalmente <span class="blank _15"> </span>na <span class="blank _15"> </span>forma <span class="blank _15"> </span>solúvel: <span class="blank _15"> </span>mono<span class="blank _3"></span>ssacarídeos, <span class="blank _15"> </span>sacarose <span class="blank _15"> </span>e <span class="blank _15"> </span>frutan<span class="blank _3"></span>as. <span class="blank _15"> </span>Por </div><div class="t m0 x1 h4 y35 ff1 fs1 fc0 sc0 ls1 ws1">exemplo, <span class="blank _6"> </span>as <span class="blank _6"> </span>frutanas <span class="blank _6"> </span>pred<span class="blank _2"> </span>ominam <span class="blank _6"> </span>nas <span class="blank _6"> </span>células <span class="blank _6"> </span>dos <span class="blank _6"> </span>colmos <span class="blank _6"> </span>em <span class="blank _6"> </span>p<span class="blank _2"> </span>astagens </div><div class="t m0 x1 h4 y36 ff1 fs1 fc0 sc0 ls1 ws1">temperadas e cereais, e sacarose é estocada em espécies C4 (milh<span class="blank _3"></span>o e cana-de-</div><div class="t m0 x1 h4 y37 ff1 fs1 fc0 sc0 ls1 ws1">acúcar). </div><div class="t m0 xa h4 y38 ff1 fs1 fc0 sc0 ls1 ws1">Ao <span class="blank _17"> </span>contrário <span class="blank _10"> </span>do<span class="blank _2"> </span> <span class="blank _10"> </span>mo<span class="blank _2"> </span>vimento <span class="blank _17"> </span>da <span class="blank _17"> </span>água <span class="blank _10"> </span>e<span class="blank _2"> </span> <span class="blank _10"> </span>sais <span class="blank _17"> </span>minerais <span class="blank _17"> </span>absorvidos <span class="blank _17"> </span>pelas </div><div class="t m0 x1 h4 y39 ff1 fs1 fc0 sc0 ls1 ws1">raízes, <span class="blank _4"> </span>cuja <span class="blank _7"> </span>direção <span class="blank _7"> </span>no <span class="blank _7"> </span>xilema <span class="blank _4"> </span>é <span class="blank _7"> </span>e<span class="blank _2"> </span>ssencial<span class="blank _3"></span>mente <span class="blank _7"> </span>no <span class="blank _7"> </span>sentido <span class="blank _7"> </span>ascendente, </div><div class="t m0 x1 h4 y3a ff1 fs1 fc0 sc0 ls1 ws1">seguindo <span class="blank _1"> </span>o <span class="blank _1"> </span>grad<span class="blank _2"> </span>iente <span class="blank _5"> </span>de<span class="blank _2"> </span> <span class="blank _5"> </span>p<span class="blank _2"> </span>otencial <span class="blank _1"> </span>hídrico, <span class="blank _1"> </span>os <span class="blank _0"> </span>fotoassimilados <span class="blank _5"> </span>mov<span class="blank _2"> </span>imentam-se </div><div class="t m0 x1 h4 y3b ff1 fs1 fc0 sc0 ls1 ws1">pelo floema e<span class="blank _2"> </span>m qualquer sen<span class="blank _2"> </span>tido (folhas e raízes, p<span class="blank _2"> </span>or exemplo). A <span class="blank _2"> </span>translocação </div><div class="t m0 x1 h4 y3c ff1 fs1 fc0 sc0 ls1 ws1">de <span class="blank _15"> </span>assimila<span class="blank _3"></span>dos <span class="blank _15"> </span>das <span class="blank _15"> </span>raízes <span class="blank _17"> </span>para<span class="blank _2"> </span> <span class="blank _15"> </span>a <span class="blank _17"> </span>p<span class="blank _2"> </span>arte <span class="blank _15"> </span>aérea <span class="blank _15"> </span>é <span class="blank _17"> </span>u<span class="blank _2"> </span>m <span class="blank _15"> </span>fen<span class="blank _3"></span>ômeno <span class="blank _17"> </span>com<span class="blank _2"> </span>um <span class="blank _15"> </span>em </div></div><div class="pi" data-data="{"ctm":[1.000000,0.000000,0.000000,1.000000,0.000000,0.000000]}"></div></div> <div id="pf9" class="pf w0 h0" data-page-no="9"><div class="pc pc9 w0 h0"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls1 ws1">Pereira, <span class="blank _0"> </span>L.E.T. <span class="blank _0"> </span>e <span class="blank _1"> </span>Paiva<span class="blank _2"> </span>, <span class="blank _0"> </span>A.J. <span class="blank _0"> </span>O <span class="blank _1"> </span>ma<span class="blank _2"> </span>nejo <span class="blank _0"> </span>de <span class="blank _1"> </span>pas<span class="blank _2"> </span>tagens <span class="blank _0"> </span>e <span class="blank _1"> </span>as<span class="blank _2"> </span> <span class="blank _1"> </span>re<span class="blank _2"> </span>lações <span class="blank _0"> </span>fonte/dren<span class="blank _2"> </span>o <span class="blank _0"> </span>na <span class="blank _1"> </span>planta<span class="blank _2"> </span> </div><div class="t m0 x1 h2 y2 ff1 fs0 fc0 sc0 ls1 ws1">forrageira. PU<span class="blank _2"> </span>BVET, V.2, N.22, <span class="blank _2"> </span>Art#244, <span class="blank _2"> </span>Jun1, 2008<span class="blank _2"> </span>.<span class="ff2 fs1"> </span></div><div class="t m0 x2 h3 y3 ff2 fs1 fc0 sc0 ls1 ws1"> </div><div class="t m0 x1 h4 y1f ff1 fs1 fc0 sc0 ls1 ws1">plantas que <span class="blank _2"> </span>acumulam <span class="blank _2"> </span>reservas <span class="blank _2"> </span>em <span class="blank _2"> </span>estruturas subterrâneas <span class="blank _2"> </span>da <span class="blank _2"> </span>fase <span class="blank _2"> </span>vegetativa </div><div class="t m0 x1 h4 y20 ff1 fs1 fc0 sc0 ls1 ws1">para a época de frutificação. </div><div class="t m0 xa h4 y21 ff1 fs1 fc0 sc0 ls1 ws1">O <span class="blank _5"> </span>transporte <span class="blank _1"> </span>de <span class="blank _5"> </span>assimilados <span class="blank _5"> </span>nos <span class="blank _1"> </span>tubos <span class="blank _5"> </span>do <span class="blank _5"> </span>floem<span class="blank _2"> </span>a <span class="blank _5"> </span>não <span class="blank _5"> </span>depende <span class="blank _5"> </span>de <span class="blank _5"> </span>g<span class="blank _2"> </span>asto </div><div class="t m0 x1 h4 y22 ff1 fs1 fc0 sc0 ls1 ws1">energético, <span class="blank _16"> </span>pois <span class="blank _6"> </span>trata-se <span class="blank _16"> </span>d<span class="blank _2"> </span>e <span class="blank _6"> </span>um <span class="blank _16"> </span>movimento <span class="blank _16"> </span>p<span class="blank _2"> </span>assivo, <span class="blank _16"> </span>qu<span class="blank _2"> </span>e <span class="blank _16"> </span>acompanha <span class="blank _16"> </span>um<span class="blank _2"> </span> </div><div class="t m0 x1 h4 y23 ff1 fs1 fc0 sc0 ls1 ws1">gradiente <span class="blank _a"> </span>de <span class="blank _a"> </span>pressão <span class="blank _0"> </span>(\u2206P)<span class="blank _2"> </span> <span class="blank _a"> </span>no <span class="blank _0"> </span>interior <span class="blank _a"> </span>dos <span class="blank _a"> </span>elementos <span class="blank _a"> </span>condutores, <span class="blank _0"> </span>seg<span class="blank _2"> </span>uindo <span class="blank _0"> </span>o </div><div class="t m0 x1 h4 y24 ff1 fs1 fc0 sc0 ls1 ws1">modelo <span class="blank _5"> </span>de <span class="blank _5"> </span>fluxo-pressão. <span class="blank _5"> </span>Este <span class="blank _5"> </span>modelo <span class="blank _5"> </span>associa <span class="blank _5"> </span>o <span class="blank _9"> </span>m<span class="blank _2"> </span>ovimento <span class="blank _5"> </span>de <span class="blank _5"> </span>materiais <span class="blank _5"> </span>pelo </div><div class="t m0 x1 h4 y25 ff1 fs1 fc0 sc0 ls1 ws1">floema <span class="blank _4"> </span>ao <span class="blank _7"> </span>g<span class="blank _2"> </span>radiente <span class="blank _7"> </span>de <span class="blank _7"> </span>pressão, <span class="blank _7"> </span>ou <span class="blank _4"> </span>seja, <span class="blank _7"> </span>há <span class="blank _7"> </span>diferenças <span class="blank _7"> </span>de <span class="blank _7"> </span>pressão <span class="blank _7"> </span>de </div><div class="t m0 x1 h4 y26 ff1 fs1 fc0 sc0 ls1 ws1">turgescência <span class="blank _13"> </span>ent<span class="blank _3"></span>re <span class="blank _13"> </span>o <span class="blank _13"> </span>local<span class="blank _3"></span> <span class="blank _13"> </span>de <span class="blank _13"> </span>carregamento <span class="blank _19"> </span>(P<span class="blank _2"> </span>-fonte) <span class="blank _13"> </span>e <span class="blank _1e"> </span>o <span class="blank _1e"> </span>local <span class="blank _1e"> </span>d<span class="blank _2"> </span>e </div><div class="t m0 x1 h4 y27 ff1 fs1 fc0 sc0 ls1 ws1">descarregamento <span class="blank _a"> </span>no <span class="blank _a"> </span>floema <span class="blank _a"> </span>do <span class="blank _a"> </span>dreno <span class="blank _a"> </span>(P-dre<span class="blank _2"> </span>no). <span class="blank _a"> </span>Este <span class="blank _a"> </span>assunt<span class="blank _3"></span>o <span class="blank _a"> </span>será <span class="blank _a"> </span>discutido </div><div class="t m0 x1 h4 y28 ff1 fs1 fc0 sc0 ls1 ws1">em capítulo posterior. </div><div class="t m0 xa h4 y29 ff1 fs1 fc0 sc0 ls1 ws1">O <span class="blank _5"> </span>transporte <span class="blank _1"> </span>de <span class="blank _5"> </span>e<span class="blank _2"> </span>lementos <span class="blank _5"> </span>do <span class="blank _1"> </span>tubo <span class="blank _5"> </span>crivado <span class="blank _1"> </span>com <span class="blank _5"> </span>fotoassimilados <span class="blank _5"> </span>realiza-</div><div class="t m0 x1 h4 y2a ff1 fs1 fc0 sc0 ls1 ws1">se <span class="blank _0"> </span>geralmente <span class="blank _0"> </span>nos <span class="blank _1"> </span>ter<span class="blank _2"> </span>minais <span class="blank _1"> </span>d<span class="blank _2"> </span>o <span class="blank _0"> </span>floema <span class="blank _0"> </span>associado <span class="blank _1"> </span>à<span class="blank _2"> </span> <span class="blank _0"> </span>células<span class="blank _3"></span> <span class="blank _0"> </span>do <span class="blank _0"> </span>mesófilo <span class="blank _0"> </span>foliar </div><div class="t m0 x1 h4 y2b ff1 fs1 fc0 sc0 ls1 ws1">ou <span class="blank"> </span>células-fonte. <span class="blank"> </span>Entretanto, <span class="blank"> </span>transporte <span class="blank"> </span>lateral <span class="blank"> </span>d<span class="blank _2"> </span>e <span class="blank"> </span>solutos <span class="blank"> </span>do <span class="blank _16"> </span>floema <span class="blank"> </span>para </div><div class="t m0 x1 h4 y2c ff1 fs1 fc0 sc0 ls1 ws1">tecidos <span class="blank _2"> </span>adjacentes <span class="blank _2"> </span>também <span class="blank _2"> </span>oco<span class="blank _2"> </span>rre, <span class="blank _2"> </span>sendo <span class="blank _2"> </span>de <span class="blank _2"> </span>gra<span class="blank _2"> </span>nde i<span class="blank _2"> </span>mportâ<span class="blank _3"></span>ncia <span class="blank _2"> </span>o <span class="blank _2"> </span>acúmulo <span class="blank _2"> </span>de<span class="blank _2"> </span> </div><div class="t m0 x1 h4 y2d ff1 fs1 fc0 sc0 ls1 ws1">assimilados <span class="blank _9"> </span>nos <span class="blank _9"> </span>caules, <span class="blank _9"> </span>constituind<span class="blank _2"> </span>o <span class="blank _9"> </span>um <span class="blank _5"> </span>depósito <span class="blank _9"> </span>de <span class="blank _9"> </span>reserva <span class="blank _5"> </span>temporário <span class="blank _9"> </span>capaz </div><div class="t m0 x1 h4 y2e ff1 fs1 fc0 sc0 ls1 ws1">de <span class="blank _9"> </span>suprir <span class="blank _2"> </span>a<span class="blank _2"> </span> <span class="blank _2"> </span>planta <span class="blank _9"> </span>em <span class="blank _9"> </span>períodos <span class="blank _2"> </span>d<span class="blank _2"> </span>e <span class="blank _2"> </span>e<span class="blank _2"> </span>scassez <span class="blank _9"> </span>de <span class="blank _9"> </span>fotoassimi<span class="blank _3"></span>lados. <span class="blank _9"> </span>Nesse <span class="blank _9"> </span>caso, <span class="blank _2"> </span>os </div><div class="t m0 x1 h4 y2f ff1 fs1 fc0 sc0 ls1 ws1">açucares <span class="blank _17"> </span>de <span class="blank _17"> </span>reserva <span class="blank _10"> </span>sã<span class="blank _2"> </span>o <span class="blank _17"> </span>remobiliz<span class="blank _3"></span>ados <span class="blank _17"> </span>e <span class="blank _17"> </span>redistribuídos <span class="blank _17"> </span>via <span class="blank _17"> </span>floema. <span class="blank _10"> </span>O <span class="blank _17"> </span>ca<span class="blank _2"> </span>ul<span class="blank _3"></span>e </div><div class="t m0 x1 h4 y30 ff1 fs1 fc0 sc0 ls1 ws1">normalmente <span class="blank _15"> </span>funciona <span class="blank _17"> </span>como <span class="blank _15"> </span>órg<span class="blank _2"> </span>ão <span class="blank _15"> </span>d<span class="blank _3"></span>e <span class="blank _15"> </span>reserva <span class="blank _15"> </span>temporária<span class="blank _3"></span>, <span class="blank _15"> </span>remobilizando <span class="blank _15"> </span>e </div><div class="t m0 x1 h4 y31 ff1 fs1 fc0 sc0 ls1 ws1">redistribuindo assimilados durante a noite. </div><div class="t m0 xe h4 y32 ff1 fs1 fc0 sc0 ls1 ws1">Os <span class="blank _2"> </span>solutos <span class="blank _9"> </span>mais <span class="blank _2"> </span>impor<span class="blank _2"> </span>tantes <span class="blank _2"> </span>transportados <span class="blank _9"> </span>pelo <span class="blank _2"> </span>floema <span class="blank _2"> </span>são <span class="blank _9"> </span>produtos <span class="blank _2"> </span>d<span class="blank _2"> </span>a </div><div class="t m0 x1 h4 y33 ff1 fs1 fc0 sc0 ls1 ws1">fotossíntese. <span class="blank _15"> </span>L<span class="blank _3"></span>evand<span class="blank _2"> </span>o-se <span class="blank _15"> </span>em <span class="blank _15"> </span>conta<span class="blank _3"></span> <span class="blank _15"> </span>que <span class="blank _17"> </span>so<span class="blank _2"> </span>mente <span class="blank _15"> </span>algumas <span class="blank _17"> </span>partes <span class="blank _15"> </span>da <span class="blank _15"> </span>planta </div><div class="t m0 x1 h4 y34 ff1 fs1 fc0 sc0 ls1 ws1">fazem <span class="blank _15"> </span>fotossíntese, <span class="blank _15"> </span>o <span class="blank _15"> </span>transporte <span class="blank _15"> </span>no <span class="blank _15"> </span>floema <span class="blank _15"> </span>é <span class="blank _15"> </span>essencial <span class="blank _15"> </span>para <span class="blank _15"> </span>que <span class="blank _15"> </span>todos <span class="blank _15"> </span>os </div><div class="t m0 x1 h4 y35 ff1 fs1 fc0 sc0 ls1 ws1">órgãos <span class="blank _1d"> </span>do <span class="blank _1f"> </span>vegetal <span class="blank _1f"> </span>sejam <span class="blank _1f"> </span>supridos. <span class="blank _1d"> </span>No <span class="blank _1f"> </span>caso <span class="blank _1f"> </span>do<span class="blank _2"> </span> <span class="blank _1f"> </span>transporte <span class="blank _1f"> </span>de<span class="blank _2"> </span> <span class="blank _1f"> </span>solutos </div><div class="t m0 x1 h4 y36 ff1 fs1 fc0 sc0 ls1 ws1">inorgânicos, <span class="blank _a"> </span>o <span class="blank _e"> </span>floema <span class="blank _e"> </span>também <span class="blank _e"> </span>é <span class="blank _a"> </span>d<span class="blank _2"> </span>e <span class="blank _e"> </span>importância <span class="blank _a"> </span>fundamental. <span class="blank _a"> </span>Com<span class="blank _2"> </span>o <span class="blank _e"> </span>a <span class="blank _a"> </span>força </div><div class="t m0 x1 h4 y37 ff1 fs1 fc0 sc0 ls1 ws1">motriz <span class="blank _5"> </span>para <span class="blank _1"> </span>a <span class="blank _1"> </span>absorção <span class="blank _1"> </span>d<span class="blank _2"> </span>e <span class="blank _5"> </span>sol<span class="blank _2"> </span>utos <span class="blank _5"> </span>inorg<span class="blank _2"> </span>ânicos <span class="blank _5"> </span>normalmente <span class="blank _1"> </span>é <span class="blank _1"> </span>a <span class="blank _1"> </span>transpiração, </div><div class="t m0 x1 h4 y38 ff1 fs1 fc0 sc0 ls1 ws1">os <span class="blank _15"> </span>nut<span class="blank _3"></span>rientes <span class="blank _15"> </span>provenientes <span class="blank _15"> </span>do <span class="blank _15"> </span>sol<span class="blank _3"></span>o <span class="blank _15"> </span>t<span class="blank _3"></span>ende<span class="blank _2"> </span>m <span class="blank _15"> </span>a <span class="blank _17"> </span>se <span class="blank _15"> </span>acumul<span class="blank _3"></span>ar <span class="blank _15"> </span>nos <span class="blank _17"> </span>ór<span class="blank _2"> </span>gãos <span class="blank _15"> </span>que </div><div class="t m0 x1 h4 y39 ff1 fs1 fc0 sc0 ls1 ws1">transpiram <span class="blank _9"> </span>mais, <span class="blank _9"> </span>co<span class="blank _2"> </span>mo <span class="blank _9"> </span>as <span class="blank _9"> </span>fo<span class="blank _2"> </span>lhas <span class="blank _9"> </span>mad<span class="blank _2"> </span>uras, <span class="blank _9"> </span>em <span class="blank _5"> </span>detrimento <span class="blank _9"> </span>do<span class="blank _2"> </span>s <span class="blank _9"> </span>que <span class="blank _5"> </span>transpiram </div><div class="t m0 x1 h4 y3a ff1 fs1 fc0 sc0 ls1 ws1">menos, <span class="blank _7"> </span>como <span class="blank _8"> </span>os <span class="blank _8"> </span>brotos <span class="blank _8"> </span>novos <span class="blank _8"> </span>e <span class="blank _7"> </span>frutos. <span class="blank _7"> </span>P<span class="blank _2"> </span>ara <span class="blank _8"> </span>corrigir <span class="blank _7"> </span>isso,<span class="blank _2"> </span> <span class="blank _7"> </span>os <span class="blank _8"> </span>vegetais </div><div class="t m0 x1 h4 y3b ff1 fs1 fc0 sc0 ls1 ws1">redistribuem <span class="blank _a"> </span>o<span class="blank _2"> </span>s <span class="blank _a"> </span>nutrientes <span class="blank _a"> </span>de <span class="blank _e"> </span>um <span class="blank _a"> </span>órgão <span class="blank _a"> </span>p<span class="blank _2"> </span>ara <span class="blank _a"> </span>outro <span class="blank _a"> </span>através <span class="blank _a"> </span>d<span class="blank _2"> </span>o <span class="blank _a"> </span>floema. <span class="blank _a"> </span>Uma </div><div class="t m0 x1 h4 y3c ff1 fs1 fc0 sc0 ls1 ws1">conseqüência <span class="blank _0"> </span>disso <span class="blank _0"> </span>é <span class="blank _0"> </span>que <span class="blank _0"> </span>aque<span class="blank _2"> </span>les <span class="blank _0"> </span>nutrientes <span class="blank _0"> </span>que <span class="blank _0"> </span>não <span class="blank _0"> </span>são <span class="blank _0"> </span>transportados <span class="blank _0"> </span>pelo </div></div><div class="pi" data-data="{"ctm":[1.000000,0.000000,0.000000,1.000000,0.000000,0.000000]}"></div></div> <div id="pfa" class="pf w0 h0" data-page-no="a"><div class="pc pca w0 h0"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls1 ws1">Pereira, <span class="blank _0"> </span>L.E.T. <span class="blank _0"> </span>e <span class="blank _1"> </span>Paiva<span class="blank _2"> </span>, <span class="blank _0"> </span>A.J. <span class="blank _0"> </span>O <span class="blank _1"> </span>ma<span class="blank _2"> </span>nejo <span class="blank _0"> </span>de <span class="blank _1"> </span>pas<span class="blank _2"> </span>tagens <span class="blank _0"> </span>e <span class="blank _1"> </span>as<span class="blank _2"> </span> <span class="blank _1"> </span>re<span class="blank _2"> </span>lações <span class="blank _0"> </span>fonte/dren<span class="blank _2"> </span>o <span class="blank _0"> </span>na <span class="blank _1"> </span>planta<span class="blank _2"> </span> </div><div class="t m0 x1 h2 y2 ff1 fs0 fc0 sc0 ls1 ws1">forrageira. PU<span class="blank _2"> </span>BVET, V.2, N.22, <span class="blank _2"> </span>Art#244, <span class="blank _2"> </span>Jun1, 2008<span class="blank _2"> </span>.<span class="ff2 fs1"> </span></div><div class="t m0 x2 h3 y3 ff2 fs1 fc0 sc0 ls1 ws1"> </div><div class="t m0 x1 h5 y1f ff1 fs1 fc0 sc0 ls1 ws1">floema <span class="blank _15"> </span>(<span class="blank _2"> </span>Ca<span class="fs2 ws6 v1">+2</span> <span class="blank _15"> </span>, <span class="blank"> </span>S<span class="blank _3"></span>O<span class="fs2 ws0 v3">4<span class="v4">-2</span></span>e <span class="blank _15"> </span>Fe) <span class="blank"> </span>fi<span class="blank _3"></span>cam <span class="blank _15"> </span>em <span class="blank _f"> </span>baixas <span class="blank _f"> </span>concentrações <span class="blank _15"> </span>em <span class="blank _f"> </span>órgãos <span class="blank _15"> </span>que </div><div class="t m0 x1 h4 y20 ff1 fs1 fc0 sc0 ls1 ws1">transpiram pouco. </div><div class="t m0 xc h4 y21 ff1 fs1 fc0 sc0 ls1 ws1">O <span class="blank _9"> </span>movimento <span class="blank _9"> </span>de <span class="blank _9"> </span>sacarose <span class="blank _9"> </span>do <span class="blank _2"> </span>fl<span class="blank _2"> </span>oema <span class="blank _9"> </span>para <span class="blank _2"> </span>os <span class="blank _9"> </span>sítios <span class="blank _9"> </span>de <span class="blank _9"> </span>reserva <span class="blank _9"> </span>envolve: </div><div class="t m0 x1 h4 y22 ff1 fs1 fc0 sc0 ls1 ws1">efluxo <span class="blank _0"> </span>dos <span class="blank _a"> </span>elementos <span class="blank _a"> </span>c<span class="blank _3"></span>rivados, <span class="blank _0"> </span>d<span class="blank _2"> </span>ifusão <span class="blank _a"> </span>em <span class="blank _0"> </span>gradientes <span class="blank _0"> </span>d<span class="blank _2"> </span>e <span class="blank _0"> </span>baixa <span class="blank _a"> </span>concentração </div><div class="t m0 x1 h4 y23 ff1 fs1 fc0 sc0 ls1 ws1">na semente por apoplasto, absorção nos gr<span class="blank _2"> </span>ãos em desenvolvimento por células </div><div class="t m0 x1 h4 y24 ff1 fs1 fc0 sc0 ls1 ws1">especializadas e transp<span class="blank _2"> </span>orte simplasto para os <span class="blank _2"> </span>sítios de deposição de <span class="blank _2"> </span>amido. Por </div><div class="t m0 x1 h4 y25 ff1 fs1 fc0 sc0 ls1 ws1">sua <span class="blank _16"> </span>v<span class="blank _2"> </span>ez, <span class="blank _6"> </span>a <span class="blank _6"> </span>taxa <span class="blank _6"> </span>de <span class="blank _6"> </span>movimento <span class="blank _6"> </span>das <span class="blank _6"> </span>moléculas <span class="blank _6"> </span>de <span class="blank _6"> </span>sacarose <span class="blank _6"> </span>das <span class="blank _6"> </span>reservas </div><div class="t m0 x1 h4 y26 ff1 fs1 fc0 sc0 ls1 ws1">(cloroplasto <span class="blank _e"> </span>das <span class="blank _10"> </span>folhas <span class="blank _e"> </span>ou <span class="blank _e"> </span>re<span class="blank _2"> </span>servas <span class="blank _e"> </span>a <span class="blank _e"> </span>curto <span class="blank _10"> </span>prazo) <span class="blank _e"> </span>para <span class="blank _e"> </span>os <span class="blank _10"> </span>drenos <span class="blank _e"> </span>pode <span class="blank _10"> </span>ser </div><div class="t m0 x1 h4 y27 ff1 fs1 fc0 sc0 ls1 ws1">limitado p<span class="blank _2"> </span>or: <span class="blank _2"> </span>eventos <span class="blank _2"> </span>b<span class="blank _2"> </span>ioquímicos nas <span class="blank _9"> </span>folhas, transporte <span class="blank _2"> </span>do <span class="blank _2"> </span>floema<span class="blank _2"> </span> o<span class="blank _2"> </span>u <span class="blank _2"> </span>sítios <span class="blank _2"> </span>de </div><div class="t m0 x1 h4 y28 ff1 fs1 fc0 sc0 ls1 ws1">reservas <span class="blank _9"> </span>par<span class="blank _2"> </span>a <span class="blank _9"> </span>os <span class="blank _9"> </span>e<span class="blank _2"> </span>lementos <span class="blank _9"> </span>crivados, <span class="blank _9"> </span>transporte <span class="blank _5"> </span> <span class="blank _9"> </span>dos <span class="blank _9"> </span>elementos <span class="blank _9"> </span>crivado<span class="blank _2"> </span>s <span class="blank _9"> </span>para </div><div class="t m0 x1 h4 y29 ff1 fs1 fc0 sc0 ls1 ws1">os sítios de reserva no dreno e ou eventos bioquímicos no dreno. </div><div class="t m0 xc h4 y2a ff1 fs1 fc0 sc0 ls1 ws1"> </div><div class="t m0 x1 h4 y2b ff3 fs1 fc0 sc0 ls1 ws1">3.2 O modelo de Fluxo-Pressão </div><div class="t m0 xc h4 y2c ff1 fs1 fc0 sc0 ls1 ws1"> </div><div class="t m0 xa h4 y2d ff1 fs1 fc0 sc0 ls1 ws1">O <span class="blank _12"> </span>m<span class="blank _2"> </span>odelo <span class="blank _20"> </span>de <span class="blank _12"> </span>fluxo-pressão<span class="blank _2"> </span> <span class="blank _12"> </span>fundamenta-se <span class="blank _20"> </span>no <span class="blank _12"> </span>fato <span class="blank _20"> </span>de <span class="blank _12"> </span>q<span class="blank _2"> </span>ue <span class="blank _12"> </span>o </div><div class="t m0 x1 h4 y2e ff1 fs1 fc0 sc0 ls1 ws1">carregamento <span class="blank _11"> </span>do <span class="blank _11"> </span>floema <span class="blank _11"> </span>com <span class="blank _11"> </span>assimilados <span class="blank _11"> </span>d<span class="blank _2"> </span>a <span class="blank _11"> </span>fonte <span class="blank _11"> </span>baixa <span class="blank _11"> </span>seu <span class="blank _11"> </span>potencial </div><div class="t m0 x1 h4 y2f ff1 fs1 fc0 sc0 ls1 ws1">osmótico <span class="blank _4"> </span>(P<span class="blank _2"> </span>S) <span class="blank _4"> </span>para <span class="blank _7"> </span>valores <span class="blank _7"> </span>de <span class="blank _7"> </span>\u20132 <span class="blank _4"> </span>a <span class="blank _7"> </span>\u20133 <span class="blank _4"> </span>Mp<span class="blank _2"> </span>a, <span class="blank _7"> </span>muito <span class="blank _4"> </span>menor <span class="blank _4"> </span>d<span class="blank _2"> </span>o <span class="blank _4"> </span>q<span class="blank _2"> </span>ue <span class="blank _4"> </span>os </div><div class="t m0 x1 h4 y30 ff1 fs1 fc0 sc0 ls1 ws1">encontrados <span class="blank _5"> </span>nas <span class="blank _5"> </span>células <span class="blank _9"> </span>do <span class="blank _1"> </span>mesófilo <span class="blank _5"> </span>(-1,3 <span class="blank _5"> </span>a <span class="blank _5"> </span>\u20131,8 <span class="blank _5"> </span>Mpa).<span class="blank _3"></span> <span class="blank _5"> </span>O <span class="blank _5"> </span>baixo <span class="blank _5"> </span>PS <span class="blank _5"> </span>do <span class="blank _5"> </span>floema </div><div class="t m0 x1 h4 y31 ff1 fs1 fc0 sc0 ls1 ws1">na <span class="blank _15"> </span>fon<span class="blank _2"> </span>te <span class="blank"> </span>(carr<span class="blank _3"></span>egamento) <span class="blank"> </span>p<span class="blank _3"></span>rovoca <span class="blank"> </span>ab<span class="blank _3"></span>sorção <span class="blank _f"> </span>de <span class="blank"> </span>á<span class="blank _3"></span>gua <span class="blank _f"> </span>e, <span class="blank _15"> </span>conseqüe<span class="blank _2"> </span>ntemente, </div><div class="t m0 x1 h4 y32 ff1 fs1 fc0 sc0 ls1 ws1">aumento no potencial de pressão (PP) para valores próximos a 1 Mpa. </div><div class="t m0 xa h4 y33 ff1 fs1 fc0 sc0 ls1 ws1">Estima-se <span class="blank"> </span>q<span class="blank _2"> </span>ue <span class="blank"> </span>uma <span class="blank _16"> </span>diferença <span class="blank"> </span>de <span class="blank _16"> </span>0,12 <span class="blank"> </span>a<span class="blank _2"> </span> <span class="blank"> </span>0,46 <span class="blank _16"> </span>Mpa <span class="blank"> </span>entre <span class="blank _16"> </span>o <span class="blank"> </span>sítio <span class="blank"> </span>de </div><div class="t m0 x1 h4 y34 ff1 fs1 fc0 sc0 ls1 ws1">carregamento na <span class="blank _2"> </span>fonte <span class="blank _2"> </span>e <span class="blank _2"> </span>o <span class="blank _2"> </span>dreno <span class="blank _2"> </span>seja suficiente <span class="blank _2"> </span>para <span class="blank _2"> </span>impulsionar o <span class="blank _2"> </span>mov<span class="blank _2"> </span>imento </div><div class="t m0 x1 h4 y35 ff1 fs1 fc0 sc0 ls1 ws1">em <span class="blank _5"> </span>massa <span class="blank _5"> </span>de <span class="blank _1"> </span>assimilados <span class="blank _5"> </span>p<span class="blank _2"> </span>elo <span class="blank _1"> </span>floema. <span class="blank _5"> </span>Na <span class="blank _5"> </span>maiori<span class="blank _2"> </span>a <span class="blank _5"> </span>das <span class="blank _5"> </span>e<span class="blank _2"> </span>spécies <span class="blank _5"> </span>a <span class="blank _1"> </span>sacarose, <span class="blank _5"> </span>o </div><div class="t m0 x1 h5 y36 ff1 fs1 fc0 sc0 ls1 ws2">K<span class="fs2 ws0 v1">+</span><span class="ws1"> <span class="blank _1"> </span>e<span class="blank _2"> </span> <span class="blank _0"> </span>seus <span class="blank _1"> </span>â<span class="blank _2"> </span>nions <span class="blank _1"> </span>acomp<span class="blank _2"> </span>anhantes <span class="blank _1"> </span>são <span class="blank _0"> </span>os <span class="blank _0"> </span>solutos <span class="blank _0"> </span>que <span class="blank _0"> </span>mais <span class="blank _1"> </span>contribuem <span class="blank _0"> </span>com <span class="blank _1"> </span>a<span class="blank _2"> </span> </span></div><div class="t m0 x1 h4 y37 ff1 fs1 fc0 sc0 ls1 ws1">manutenção <span class="blank _17"> </span>da <span class="blank _17"> </span>pre<span class="blank _2"> </span>ssão <span class="blank _17"> </span>d<span class="blank _2"> </span>e <span class="blank _17"> </span>turgescência <span class="blank _17"> </span>do <span class="blank _15"> </span>floema. <span class="blank _10"> </span>O<span class="blank _2"> </span> <span class="blank _15"> </span>\u2206P<span class="blank _3"></span> <span class="blank _17"> </span>entre <span class="blank _15"> </span>o <span class="blank _17"> </span>local <span class="blank _17"> </span>de </div><div class="t m0 x1 h4 y38 ff1 fs1 fc0 sc0 ls1 ws1">carregamento <span class="blank _0"> </span>(fonte) <span class="blank _0"> </span>e <span class="blank _0"> </span>o <span class="blank _0"> </span>de <span class="blank _0"> </span>descarregamento <span class="blank _0"> </span>(dreno) <span class="blank _0"> </span>é <span class="blank _1"> </span>um <span class="blank _0"> </span>dos <span class="blank _0"> </span>fatores <span class="blank _0"> </span>que </div><div class="t m0 x1 h4 y39 ff1 fs1 fc0 sc0 ls1 ws1">determinam a velocidade de transporte no floema. </div><div class="t m0 x1 h4 y3a ff1 fs1 fc0 sc0 ls1 ws1"> <span class="blank _21"> </span>Até <span class="blank _9"> </span>o <span class="blank _9"> </span>c<span class="blank _3"></span>omeço <span class="blank _9"> </span>da <span class="blank _2"> </span>década <span class="blank _9"> </span>de <span class="blank _2"> </span>8<span class="blank _2"> </span>0 <span class="blank _9"> </span>o <span class="blank _2"> </span>movimento <span class="blank _9"> </span>a <span class="blank _2"> </span>longa <span class="blank _9"> </span>distância<span class="blank _3"></span> <span class="blank _9"> </span>no <span class="blank _2"> </span>floema<span class="blank _2"> </span> </div><div class="t m0 x1 h4 y3b ff1 fs1 fc0 sc0 ls1 ws1">era <span class="blank _7"> </span>o <span class="blank _8"> </span>principal <span class="blank _7"> </span>compone<span class="blank _2"> </span>nte <span class="blank _7"> </span>estudado, <span class="blank _7"> </span>e<span class="blank _2"> </span> <span class="blank _7"> </span>p<span class="blank _2"> </span>ara <span class="blank _7"> </span>tal, <span class="blank _7"> </span>m<span class="blank _2"> </span>uitas <span class="blank _7"> </span>teorias <span class="blank _8"> </span>foram </div><div class="t m0 x1 h4 y3c ff1 fs1 fc0 sc0 ls1 ws1">levantadas. <span class="blank _4"> </span>Nesse <span class="blank _4"> </span>co<span class="blank _2"> </span>ntexto, <span class="blank _4"> </span>o <span class="blank _7"> </span>estudo <span class="blank _4"> </span>dos <span class="blank _4"> </span>p<span class="blank _2"> </span>rocessos <span class="blank _4"> </span>de <span class="blank _7"> </span>carregamento<span class="blank _3"></span> <span class="blank _4"> </span>e </div><div class="t m0 x1 h4 y3d ff1 fs1 fc0 sc0 ls1 ws1">descarregamento <span class="blank _15"> </span>ficou <span class="blank _17"> </span>relativamente <span class="blank _15"> </span>negligenciado. <span class="blank _15"> </span>Embora <span class="blank _17"> </span>h<span class="blank _2"> </span>oje <span class="blank _15"> </span>tenhamos </div></div><div class="pi" data-data="{"ctm":[1.000000,0.000000,0.000000,1.000000,0.000000,0.000000]}"></div></div>
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