摘要
Inordertoelucidatetheroleofantioxidantresponsesinsalinitytoleranceinricegenotypesundersaltstress,experimentswereconductedusingfourricevarieties,includingsalt-sensitiveBRRIdhan28andthreesalt-tolerantvarietiesBRRIdhan47,BINAdhan8andBINAdhan10.Thirty-day-oldriceseedlingsweretransplantedintopots.Attheactivetilleringstage(35daftertransplanting),plantswereexposedtodifferentsalinitylevels(0,20,40and60mmol/LNaCl).Saltstresscausedasignificantreductioningrowthforallthericegenotypes.Growthreductionwashigherinthesalt-sensitivegenotypethaninthesalt-tolerantones,andBINAdhan10showedhighersalttoleranceinallmeasuredphysiologicalparameters.ThereductioninshootandrootbiomasswasfoundtobeminimalinBINAdhan10.ChlorophyllcontentsignificantlydecreasedundersaltstressexceptforBINAdhan10.Prolinecontentsignificantlyincreasedinsalt-tolerantricegenotypeswithincreasedsaltconcentration,andthehighestprolinecontentwasobtainedfromBINAdhan10undersaltstress.Catalaseandascorbateperoxidaseactivitiessignificantlydecreasedinsalt-sensitivegenotypewhereassignificantlyincreasedinsalt-tolerantoneswithincreasingsaltconcentration.However,saltstresssignificantlydecreasedguaiacolperoxidaseactivityinallthericegenotypesirrespectiveofsalttolerance.K+/Na+ratioalsosignificantlydecreasedinshootsandrootsofallthericegenotypes.Thesalt-tolerantgenotypeBINAdhan10maintainedhigherlevelsofchlorophyllandprolinecontentsaswellascatalaseandascorbateperoxidaseactivitiesundersaltstress,thus,thismightbetheunderlyingmechanismforsalttolerance.
出版日期
2017年03月13日（中国期刊网平台首次上网日期，不代表论文的发表时间）
