【摘要】 研究了螯合剂EDTA和DTPA对海州香薷蓄铜能力和铜毒性的影响 .结果显示 ,EDTA和DTPA能抑制植物的生长 ,使其生物量降低 ,叶绿素含量下降 ,同时降低了植物的根系活力 .EDTA和DTPA都可引起植物SOD、POD活性上升 ,在与Cu2 +共同作用下 ,EDTA对Cu2 +毒性影响较小 ,表现在SOD、POD活性仍按Cu2 +独立作用下的变化规律而变化 ,且数值上变化不大 .而DTPA则降低了Cu2 +作用下SOD、POD活性的变化 .EDTA使海州香薷地上部分铜浓度增加 ,DTPA则明显降低了海州香薷的铜含量 .更多还原

【Abstract】 Effects of chelating agents on toxicity of copper to and bioaccumulation in Elsholtzia splendens were investigated. EDTA (ethylenediaminetetraacetic acid) and DTPA (diethylenetriaminepentaacetic acid) inhibited plant growth, decreased the biomass, chlorophyll content and root activity. EDTA had very low or no influence on the toxicity of copper to Elsholtzia splendens. DTPA decreased copper-induced toxicity. DTPA decreased copper accumulation in Elsholtzia splendens. EDTA increased copper transfer from the subterranean part to the aerial part of the plant.更多还原