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1、中國水稻科學(ChinJRiceSci),２０１６,３０(３):２９１－３０３http://www．ricesci．cnDOI:１０．１６８１９/j．１００１Ｇ７２１６．２０１６．５０６３２９１茉莉酸甲酯對武運粳２４和寧粳３號灌漿早期高溫脅迫生理特性的影響劉霞＃唐設＃竇志李剛?cè)A劉正輝王紹華丁承強丁艷鋒?(南京農(nóng)業(yè)大學,南京２１００９５;＃共同第一作者;?通訊聯(lián)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
