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1、中国水稻科学(ChinJRiceSci),２０１６,３０(３):２９１－３０３http://www．ricesci．cnDOI:１０．１６８１９/j．１００１Ｇ７２１６．２０１６．５０６３２９１茉莉酸甲酯对武运粳２４和宁粳３号灌浆早期高温胁迫生理特性的影响刘霞＃唐设＃窦志李刚华刘正辉王绍华丁承强丁艳锋∗(南京农业大学,南京２１００９５;＃共同第一作者;∗通讯联系人,EＧmail:Dingyf＠njau．edu．cn)EffectsofMeJAonthePhysiologicalCharacterist
2、icsofjaponicaRiceWuyunＧjing２４andNingjing３DuringEarlyGrainFillingStageUnderHeatStressLIUXia＃,TANGShe＃,DOUZhi,LIGangＧhua,LIUZhengＧhui,WANGShaoＧhua,DINGChengＧqiang,DINGYanＧfeng∗(NanjingAgriculturalUniversity,Nanjing２１００９５,China;＃Theseauthorscontributedequa
3、llytothiswork;∗Correspondingauthor,EＧmail:Dingyf＠njaue．duc．n)LIUXia,TANGShe,DOUZhi,etal．EffectsofMeJAonthephysiologicalcharacteristicsofjaponicaricewuyunjing２４andNingjing３duringearlygrainfillingstageunderheatstress．ChinJRiceSci,２０１６,３０(３):２９１Ｇ３０３．Abstra
4、ct:Methyljasmonate(MeJA)wasusedontheconventionaljaponicaricevarietiesWuyunjing２４andNingjing３tostudyitseffectsonricephysiologicalcharacteristicsunderhightemperaturestressduringearlygrainfillingstage．TheresultsindicatedthatMeJAcouldincreasetheaccumulation
5、ofsolublesugarinriceleafandkeeptheosmoticbalances．Furthermore,MeJAincreasedthestomatalconductance(Gs)andtranspirationrate(Tr),whichaccordinglyreducedthetemperatureofleafandpanicleandfurthereffectivelyalleviatedthehightemperaturedamages．ExogenousMeJAredu
6、cedtheheatdamagestothephotosyntheticsystem,therebyleadingtotheincreasedPSⅡmaximumquantumyield(Fv/Fm),photochemicalefficiency(ΦPSⅡ),photosyntheticelectrontransportrate(ETR),energyratioofphotochemicalreactions(Pr)andnetphotosyntheticrate(Pn)．Increasedgrai
7、nweightandseedsettingratewerefoundinthoseMeJAtreatedriceplantsandantioxidantenzymeactivityanalysisshowedthatwhenexposedtohightemperaturefor１２days,superoxidedismutase(SOD)andperoxidase(POD)antioxidantenzymeactivitiesofWuyunjing２４weredecreased,whileSODand
8、PODactivitiesofNingjing３inlatestageofhighＧtemperaturetreatmentweregreatlyincreasedcomparedtotheCK．TheresultsindicatedthatMeJAenhancedtheactivitiesofSODandPODandreducedtheaccumulationofmalonaldehyde(MDA),whichultimatelyincreasedth
