Translocation analysis and safety assessment of cadmium and lead in two water spinach cultivars with distinctive shoot Cd and Pb concentrations

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• 作者：辛俊亮黄白飞刘爱群周雯婧廖可兵
• 会议时间：2013-10-11
• 关键词：cadmium (Cd) ; lead (Pb) ; water spinach (Ipomoea aquatica Forsk.) ; cultivars ; translocation
• 作者单位：湖南工学院安全与环境工程学院
• 母体文献：第三届重金属污染防治及风险评价研讨会暨重金属污染防治专业委会2013年学术年会论文集
• 会议名称：第三届重金属污染防治及风险评价研讨会暨重金属污染防治专业委会2013年学术年会
• 会议地点：长沙
• 主办单位：中国环境科学学会
• 语种：chi
• 分类号：TQ5;TP3

摘要

Abstract A pot experiment was conducted to investigate the translocation of Cd and Pb and assess the safety of edible parts in two cultivars of water spinach (Ipomoea aquatica Forsk,) contrasting in shoot Cd and Pb concentrations.A low-Cd-Pb cultivar (QLQ) and a high-Cd-Pb cultivar (T308) were grown in five soils with different concentrations of Cd and Pb.The results showed that QLQ had lower Cd and Pb concentrations in stems and leaves and higher root Cd concentration than T308 did.Root Pb concentration of T308 dramatically increased with the soil Pb concentration and was higher than that of QLQ in the highest Pb treatment.The root-to-stem Cd translocation ability in T308 was 2.3-3.0-fold higher than that in QLQ.Nevertheless, no significant relationship existed in the root-to-stem Pb translocation between QLQ and T308.The bioconcentration factors (BCFs) for Cd and Pb in the two cultivars remained stable in different Cd or Pb treatments, which were attributable to the homeostatic control mechanisms of Cd and Pb in water spinach.