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1、棉花学报CottonScience2014袁26渊5冤院452~458花铃期干旱对不同部位棉铃对位叶糖代谢及铃重的影响11111*2杨长琴袁刘瑞显袁杨富强袁张国伟袁徐立华袁周治国渊1.江苏省农业科学院经济作物研究所/农业部长江下游棉花与油菜重点实验室袁江苏南京210014曰2.南京农业大学农学院/农业部南方作物生理生态重点开放实验室袁江苏南京210095冤摘要院以美棉33B为材料袁于棉花中部果枝开花时进行干旱处理渊土壤相对含水量由(75依5)％自然减少直至吐絮冤袁研究花铃期干旱对棉铃对位叶糖代谢及铃重的影响遥结果表明袁花铃期干旱处理袁棉铃对位叶净光合速率降低袁且中部降
2、幅＞上部＞下部曰棉铃对位叶可溶性糖含量下部和上部果枝增加而中部降低袁蔗糖含量增加而淀粉降低袁表明干旱促进叶片光合产物向蔗糖分配曰棉铃对位叶蔗糖磷酸合酶尧蔗糖合酶活性降低尧酸性转化酶活性先降低后增加,且对中部和上部的影响大于下部袁表明蔗糖合成受抑制袁而其降解先抑制后促进袁降低可供外运的蔗糖水平遥干旱条件下铃重降低袁中部降幅＞上部＞下部遥因此袁棉铃对位叶蔗糖合成减少和外运受抑制是花铃期干旱条件下铃重降低的蔗糖代谢基础遥关键词院棉花曰花铃期曰干旱曰棉铃对位叶曰蔗糖代谢曰铃重中图分类号院S562.01文献标志码院A文章编号院1002-7807(2014)05-0452-071
3、1111*2YangChangqin,LiuRuixian,YangFuqiang,ZhangGuowei,XuLihua,ZhouZhiguo(1.210014,;2.210095,)Thisstudyaimedtoillustratethemechanismofsucrosemetabolisminsubtendingleavesofcottonbollsanditsrelationshipwithbollweightunderdroughtstressduringfloweringandbollingstages.The2-year-longexperiment
4、swereconductedusingpoolsofuplandcotton(L.)plants,NuCOTN33B,subjectedtodroughtstress(relativewatercontentreducednaturallyuntilthebollopeningstage)onthedayofanthesisofthemiddlefruitingbranches(MFB),usingwell-wateredconditionsasthecontrol.Thenetphotosyntheticratedeclinedunderdroughtstressi
5、ntheboll'ssubtendingleaf,respectively,andthedeclinerangewasMFB>upperfruitingbranch(UFB)>lowerfruitingbranch(LFB).DroughtstressincreasedthesolublesugarcontentsofsubtendingleavesatLFBandUFBbutdecreasedthematMFB.Sucrosecontentwasincreasedandstarchcontentdecreasedconcomitantly,indicatingtha
6、tdroughtfacilitatedthepartitioningofphotosynthateintosucrose.Droughtstressalsodepressedtheactivitiesofsucrosephosphatesynthaseandsucrosesynthase,whileacidinvertaseactivitywasinitiallydecreasedandthenincreased.ThechangesofMFBandUFBexceededthoseofLFB,indicatingthatsucrosesynthesiswasinhib
7、ited,thedegradationwasfirstinhibitedthenpromoted,causingareductionintheamountofsucroseavailableforexport.Asaresult,thebollweightdeclinedduringdrought,andthedeclinerangewasMFB>UFB>LFB.Inconclusion,thedecreasedsucrosesynthesisandtheimpairedsucroseeffluxofsubtendingleavesofbollswe
