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1、中国水稻科学(ChinJRiceSci),２０１５,２９(６):６３７－６４７http://www．ricesci．cnDOI:１０．３９６９/ji．ssn．１００１Ｇ７２１６．２０１５．０６．０１０６３７水杨酸减轻高温抑制水稻颖花分化的作用机理研究符冠富＃张彩霞＃杨雪芹杨永杰陈婷婷赵霞符卫蒙奉保华章秀福陶龙兴∗金千瑜∗(中国水稻研究所水稻生物学国家重点实验室,杭州３１０００６;＃共同第一作者;∗通讯联系人,EＧmail:jinqy＠mail．hz．zj．cn;lxtao＠mail．hz．zj．cn)A
2、ctionMechanismbyWhichSAAlleviatesHighTemperatureＧinducedInhibitiontoSpikeletDifferentiationFUGuanＧfu＃,ZHANGCaiＧxia＃,YANGXueＧqin,YANGYongＧjie,CHENTingＧting,ZHAOXia,FUWeiＧmeng,FENGBaoＧhua,ZHANGXiuＧfu,TAOLongＧxing∗,JINQianＧyu∗(StateKeyLaboratoryofRiceBiolog
3、y,ChinaNationalRiceResearchInstitute,Hangzhou３１０００６,China;＃Theseauthorscontributedequallytothiswork;∗Correspondingauthors,EＧmail:jinqy＠mail．hz．zjc．n;lxtao＠mail．hz．zjc．n)FUGuanfu,ZHANGCaixia,YANGXueqin,etal．ActionmechanismbywhichSAalleviateshightemperatur
4、eＧinducedinhibitiontospikeletdifferentiation．ChinJRiceSci,２０１５,２９(６):６３７Ｇ６４７．Abstract:Heatstressatthespikeletprimordiumdifferentiationstageofricesignificantlydecreasesthegrainyieldduetoreducedgrainnumberperpanicle．ThehybridriceYongyou１２wasusedasmaterialt
5、oinvestigatetheroleofsalicylicacid(SA)inalleviatingthenegativeeffectonspikeletdifferentiationinducedbyheatstress．Theresultsindicatedthatundernaturalconditions,lowconcentrationofSAincreasedthespikeletnumberperpanicle,whilehighconcentrationdecreasedthenumb
6、er．Interestingly,eitherloworhighconcentrationsofSA(１０－５００００μmol/L)increasedthegrainnumberperpanicleunderheatstress．Thegrainyieldandgrainnumberperpaniclepeakedunderthetreatmentof１００μmol/LSAcomparedwiththeirrespectivecontrol(０μmol/L)underbothnaturalconditi
7、onsandheatstress．Thismightattributetotheincreaseintheleafphotosynthesisrate,antioxidantenzymeactivities,concentrationsofauxin(IAA)andzeatin(ZR)inspikeletsunderheatstress．Heatstressoccurredatspikeletdifferentiationstageseemedtocauselittledamagetotheleaf,b
8、uttheactuallightquantumefficiencyandnetphotosyntheticrateofleafwereincreasedwhensprayedwithSA．Accordingly,therewasnosignificantdifferenceintheactivitiesofSOD,PODandCATofleafinrice．However,theseantioxidantenzymeactivitiesin
