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ChlorophyllFluorescenceResponseofSpringSoybeantoChillingStressatSeedlingStageTIANXin,ZHONGCheng,LIXingyuan (CollegeofComprehensiveHealth,KailiUniversity,Kaili,Guizhou556011)Abstract [Objective]Toexplorecorrelationamongthephotosyntheticparametersunderthechillingstress,aswellasthecorrelationbetweengermplasmandtemperature.[Method]Withseedlingsoffivespringsoybeanvarietiesasthetestvarieties,wedetectedthechlorophyllcontentsaftertemperaturestressbychlorophyllfluorescencemeter.[Result]Fv/FmandqPoffivespringsoybeansallsignificantlyreduced.ComparedwiththeCKunderroomtemperature,F0andqNenhancedsignificantly,andasignificantincreaseinoriginalfluorescence(Fo)andnonphotochemicalquenching(qN)Followingchillingstresscomparedtoroomtemperaturecontrols.Comparedtoothersoybeans,theFoandqNincreasedthegreatestandtheyieldandFv/FmdecreasedthegreatestinthetolerantcultivarGuliqing.Interestingly,theqPdeclined,butremainedatahighlevel.Foincreasedtheleastincultivar#43,butitstillhadahighyield.TheFv/Fmratiowasthehighestincultivar95-1,buthadthelowestqP.qNincreasedtheleastinchillingsensitivecultivarNannong513.Takentogether,photooxidation(qN)maybeamajorcauseofdamageinNannong513,resultinginitschillingsensitivity.Incontrast,chillingtolerantcultivarGuliqingmaymaintainphotosynthesistomaintaingrowthandreducephotooxidationdamage,asreflectedbyparametersqPandqN.Thus,qPandqNmaybethemostreliableparameterstoevaluatechillingresistanceinsoybeans.Keywords Soybean;Chillingstress;Chlorophyllfluorescence;Photoinhibition;Photooxidation
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