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ResearchProgressofPlantToleranceMechanismsatCellLevelunderCadmiumStressCHENXiaoyan1,LIQiang2 (1.ChongqingCommunicationsPlanningSurvey&DesignInstitute,Chongqing401121;2.SichuanInstituteofGeologicalEngineeringInvestigation,Chengdu,Sichuan610072)Abstract Someresultsoftoleranceresearchesonthemechanismsatcelllevelinplantundercadmium(Cd)stresswerereviewed.Ontheonehand,extracellularactions,mainlyincludethechelationofrootexudates,cellwalladsorptionandimmobilization,andmycorrhization,reducingtheabsorptionofCdintothecytoplasmbyrootabsorption.Ontheotherhand,intracellularactions,mainlyincludemetallothioneins,glutataione,phytochelatin,organicacids,aminoacids,nonproteinsulfhydrylandothersubstancesincytoplasmcombinewithCd,andchamberisolationofthoseCdconjugatesintothevacuole;thesimultaneousantioxidantsystemrespondstoclearingupoxidativedamageatthesametime,whichaimedtoreduceorrelieveCdtoxicityandimproveplanttolerance.Keywords Cd;Plant;Tolerance;Extracellularaction;Intracellularaction
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