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1、棉花學(xué)報(bào)CottonScience2014袁26淵5冤院452~458花鈴期干旱對不同部位棉鈴對位葉糖代謝及鈴重的影響11111*2楊長琴袁劉瑞顯袁楊富強(qiáng)袁張國偉袁徐立華袁周治國淵1.江蘇省農(nóng)業(yè)科學(xué)院經(jīng)濟(jì)作物研究所/農(nóng)業(yè)部長江下游棉花與油菜重點(diǎn)實(shí)驗(yàn)室袁江蘇南京210014曰2.南京農(nóng)業(yè)大學(xué)農(nóng)學(xué)院/農(nóng)業(yè)部南方作物生理生態(tài)重點(diǎn)開放實(shí)驗(yàn)室袁江蘇南京210095冤摘要院以美棉33B為材料袁于棉花中部果枝開花時進(jìn)行干旱處理淵土壤相對含水量由(75依5)％自然減少直至吐絮冤袁研究花鈴期干旱對棉鈴對位葉糖代謝及鈴重的影響遙結(jié)果表明袁花鈴期干旱處理袁棉鈴對位葉凈光合速率降低袁且中部降
2、幅＞上部＞下部曰棉鈴對位葉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進(jìn)葉片光合產(chǎn)物向蔗糖分配曰棉鈴對位葉蔗糖磷酸合酶堯蔗糖合酶活性降低堯酸性轉(zhuǎn)化酶活性先降低后增加,且對中部和上部的影響大于下部袁表明蔗糖合成受抑制袁而其降解先抑制后促進(jìn)袁降低可供外運(yùn)的蔗糖水平遙干旱條件下鈴重降低袁中部降幅＞上部＞下部遙因此袁棉鈴對位葉蔗糖合成減少和外運(yùn)受抑制是花鈴期干旱條件下鈴重降低的蔗糖代謝基礎(chǔ)遙關(guān)鍵詞院棉花曰花鈴期曰干旱曰棉鈴對位葉曰蔗糖代謝曰鈴重中圖分類號院S562.01文獻(xiàn)標(biāo)志碼院A文章編號院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
