不同生长调节剂对东南景天镉积累的影响  

Effects of Different Growth Regulators on Cadmium Accumulation by Sedum alfredii H.

作　　者：何冰[1] 陆覃昱[1] 李彦彦[1] 陈小勤[1] 王学礼[1] 顾明华[1] 

机构地区：[1]广西大学农学院,南宁530004

出　　处：《农业环境科学学报》2014年第8期1538-1545,共8页Journal of Agro-Environment Science

基　　金：农业部重金属污染治理项目"广西刁江流域农产品产地重金属污染修复示范"

摘　　要：为了提高镉(Cd)超积累植物东南景天的植物修复效率,对不同植物生长调节剂调控东南景天Cd积累的作用进行了研究。在水培条件下,采用脱落酸(ABA)、生长素(IAA)、细胞分裂素(6-BA)、乙烯利(ETH)四种生长调节剂对0.1 mmol·L-1Cd处理下的东南景天进行叶面喷施处理,对其生物量、Cd含量、Cd积累量、SOD和POD活性进行了分析。结果表明:ABA处理通过提高地上部生物量和Cd含量、促进Cd向上运输,从而增加东南景天地上部对Cd的积累;IAA处理通过提高生物量、缓解Cd对叶片的毒害,从而增加东南景天地上部对Cd的积累;6-BA处理通过提高东南景天地上部生物量和Cd含量、缓解Cd对叶片的毒害,从而增加东南景天地上部对Cd的积累;ETH处理则通过抑制生长和Cd向上转运进而降低东南景天地上部对Cd的积累。在重金属污染土壤植物修复中,适量施用ABA、IAA、6-BA可提高东南景天对镉污染土壤的修复效率。Enhancing heavy metal accumulation in hyperaccumulator has been a hot topic. In the present study, the impact of plant growth regulators（PGRs）on growth and Cd accumulation of Sedum alfredii H., a Cd hyperaccumulator, was investigated under hydroponic condition with 0.10 mmol·L^-1 Cd. Four kinds of PGRs were sprayed on leaves. Application of abscisic acid（ABA）increased shoot biomass and Cd concentration, thus enhancing Cd accumulation in shoots. Supplying indole-3-acetic acid（IAA）increased shoot biomass and improved leaf Cd detoxiation, thus promoting shoot Cd accumulation. Similarly, the treatment of 6-benzylaminopurine（6-BA）also enhanced shoot Cd accumulation due to improved shoot biomass and leaf detoxification. However, addition of ethylene（ETH）decreased shoot Cd accumulation as a result of suppression of both shoot growth and Cd upward transport. The results of present study indicate that proper applications of ABA, IAA, and 6-BA could improve Cd phytoextraction efficiency of heavy metal hyperaccumulators.

关 键 词：东南景天 镉积累量 植物生长调节剂 植物修复 

分 类 号：X171.5[环境科学与工程—环境科学]