摘要
Droughtisthemajorabioticstressfactorthatlimitsriceproductionworldwide.Toevaluatetheosmoticstressresponsesinricevarietiesunderdroughtcondition,atotalof42high-yieldingricevarietieswerecollectedfromvariousresearchstationsofKeralaAgriculturalUniversityinIndia.Theexperimentalsetupcomprisesofinitialhydroponictreatmentsatdifferentosmoticpotentials,artificiallyinducedbydesiredstrengthsofpolyethyleneglycol(PEG6000),andfollowedbythepotplantedexperimentsintherain-out-zone.Theactivitiesofantioxidantenzymes,relativewatercontent,cellmembranestability,photosyntheticpigments,prolinecontent,alongwithplantgrowthparametersofthevarietiesunderdroughtconditionwereevaluated.Moreover,thestandardscoresofthesericevarietieswereassessedunderstressandrecoveryconditionsbasedonthescoringscaleoftheStandardEvaluationSystemforrice.Amongthe42ricevarieties,weidentified2ricevarieties,SwarnaprabhaandKattamodan,withlessleafrolling,betterdroughtrecoveryabilityaswellasrelativewatercontent,increasedmembranestabilityindex,osmolyteaccumulation,andantioxidantenzymeactivitiespointedtowardstheirdegreeoftolerancetodroughtstress.Thepositiveadaptiveresponsesofthesericevarietiestowardsdroughtstresscanbeusedinthegeneticimprovementofricedroughtresistancebreedingprogram.
出版日期
2017年05月15日（中国期刊网平台首次上网日期，不代表论文的发表时间）
