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1、棉花学报CottonScience2014袁26渊6冤院521~530镉胁迫对三个棉花品种渊系冤产量尧纤维品质和生理特性的影响*陈悦袁李玲袁何秋伶袁陈进红袁祝水金渊浙江省作物种质资源重点实验室/浙江大学农业与生物技术学院农学系袁杭州310058冤摘要院以抗草甘膦棉花种质系ZD-90和转Bt基因抗虫棉品种sGK3为材料袁以陆地棉标准系TM-1为对照袁研究了镉渊Cd冤胁迫下棉花生育期内的植株生长尧产量尧农艺性状尧纤维品质和抗氧化酶系统活性遥结果表明袁低浓度Cd对棉花植株的生长发育有一定的促进作用曰高浓度
2、Cd对植株的生产发育有显著的抑制作用袁植株生长量尧子棉产量和皮棉产量显著降低遥Cd胁迫对棉花单株铃数尧铃重和单铃种子数的影响较大袁而对衣分无显著影响遥不同浓度Cd处理间的棉花纤维品质性状无显著差异遥棉花植株体内的抗氧化化物酶渊POD尧SOD和CAT冤活性在棉花生长发育的初期或低浓度胁迫条件下迅速升高袁但随着Cd浓度的增大和胁迫时间的延长袁酶活性受到抑制遥植株体内累积的MDA含量则随着Cd处理浓度的增加和胁迫时间的延长呈逐渐升高趋势遥3个品种比较袁TM-1对Cd较敏感袁ZD-90次之袁sGK3受Cd胁
3、迫的为害相对较轻袁是一个较耐Cd的棉花品种遥关键词院棉花曰镉胁迫曰产量曰纤维品质曰抗氧化酶系统曰MDA中图分类号院S562.01文献标志码院A文章编号院1002-7807(2014)06-0521-10*ChenYue,LiLing,HeQiulin,ChenJinhong,ZhuShuijin(310058,):Atwo-yearpotexperimentwascarriedouttostudytheyield,fiberquality,andphysiologicaltraitsoftwotra
4、nsgenicu-plandcottongermplasms(ZD-90andsGK3),usingtheuplandcottonstandardlineTM-1asacheck,underdifferentlevelsofcadmium(Cd)stress.TheresultsshowedthatlowerlevelCdtreatmentshadincreasingeffectsonthegrowthanddevelopmentofcottonplants,whilehigherlevelsofC
5、dgreatlyinhibitedthegrowthanddevelopmentofplants,whichledtoasignificantde-creaseinplantsize,seedcottonyield,andlintcottonyield.Amongtheagronomictraits,bollnumberperplant,bollweight,andseednumberperbollwerethemostsusceptibletraitstoCdstress,whilelintper
6、centagewastheleastaffected.Cdstresshadlittleeffectonfiberqualitytraits(staplelength,fiberstrength,andmicronaire);differencesamongthetreatmentswereinsignificant.Physiologicalandbiochemicalanalysisofcottonplantsindicatedthattheactivityofantioxidantenzyme
7、ssuchasPOD,SOD,学报页脚andCATincreasedgreatlytoavoidharmfromtheincreaseofreactiveoxygenspeciescausedbyCdstressatlowerlevelsofCdtreatment.WiththeincreaseofCdlevelandgrowthperiodlength,theiractivitieswereinhibitedgreatly,whiletheMDAcontentincreasedgradually.
8、Accordingtotheresultsofourexperimentsonplantgrowth,yield,fiberquality,antioxidantenzymeactivi-ty,andMDAcontent,TM-1wasthemostsusceptibleuplandcottongermplasmtoCdstress,followedbyZd-90.sGK3hadout-standingCdtoleranceamongthematerialsinthe
