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1、第29卷第9期2009年9月环境科学学报ActaScientiaeCircumstantiaeVol.29,No.9Sep.,2009努扎艾提·艾比布,刘云国,曾光明,等.2009.香根草对镉毒害的生理耐性和积累特性[J].环境科学学报,29(9):1958-1963NUZA’AITI·Aibibu,LiuYG,ZengGM,etal.2009.CadmiumtoleranceandaccumulationcharacteristicsofVetiveriazizanioides[J].ActaScientiaeCircumstantiae,29(9):195
2、8-1963香根草对镉毒害的生理耐性和积累特性努扎艾提·艾比布,刘云国3,曾光明,徐立,宋华晓,陈贝贝湖南大学环境科学与工程学院,长沙410082收稿日期:2008211213修回日期:2009203201录用日期:2009206210摘要:研究了不同Cd水平(0、1、7.5、15、30mg·L-1)对香根草生理生化指标的影响.实验结果表明,香根草对Cd的积累能力与处理浓度密切相关,体内积累的Cd含量随着Cd处理浓度的增加逐渐增加.当Cd处理浓度为30mg·L-1时,根系积累的Cd含量最高达到2232mg·kg-1(以干重计).低浓度Cd(1mg·L-1和7.5m
3、g·L-1)可促进叶绿素含量和根系活力,但随着Cd处理浓度的增加,叶绿素含量和根系活力逐渐下降.不同浓度的Cd胁迫增加了植物体内丙二醛(MDA)含量、过氧化物酶(POD)和过氧化氢酶(CAT)活性.可溶性蛋白质含量随着Cd处理浓度的增加逐渐下降.香根草对Cd的积累能力很高且主要分布在根部,但将Cd运输到地上部的能力较差.香根草虽不是Cd超积累植物,但具有比较强的稳定化能力,在污染土壤的修复方面有一定应用潜力.关键词:香根草;生理反应;Cd文章编号:025322468(2009)0921958206中图分类号:X171.5文献标识码:ACadmiumtoleranc
4、eandaccumulationcharacteristicsofVetiveriazizanioidesNUZA’AITI·Aibibu,LIUYunguo3,ZENGGuangming,XULi,SONGHuaxiao,CHENBeibeiCollegeofEnvironmentalScienceandEngineering,HunanUniversity,Changsha410082Received13November2008;receivedinrevisedform1March2009;accepted10June2009Abstract:Thepres
5、entexperimentwascarriedouttostudythephysiologicalresponseofVetiveriazizanioidestodifferentconcentrationsofCd(0,1,7.5,15and30·mgL-1).TheplantsaccumulatedlargeamountsofCd,uptoamaximumof2232mg·kg-1(DW)onday15whentheplantwastreatedwith30mg·L-1Cd.TheaccumulationofCdincreasedinaconcentratio
6、ndependentmannerwithmoreCdbeingaccumulatedintheroot.TheresultsshowedthatexposuretolowerCdlevels(1and7.5mg·L-1)ledtoincreasedchlorophyllcontentsandrootactivities,whilehigherlevelofCdtreatmentcausedasignificantdecreaseintheseparameters.Malondialdehyde(MDA)contents,activitiesofcatalase(C
7、AT)andperoxidase(POD)werefoundtobesignificantlyenhancedatallCdconcentrations.Significantdecreaseintheproteincontentswererecordedincadmiumtreatedrootsandleaves.CdconcentrationsinvetivergrasswerepositivelycorrelatedwithCdconcentrationinthesolution.MostoftheCdtakenupbyvetiveraccumulatedi
8、nther
