盐生植物盐芥耐镉、铜和铅胁迫响应的比较研究

COMPARATIVE STUDY ON THE RESPONSES OF HALOPHYTE THELLUNGIELIA HALOPHILA TO CDMIUM,COPPER AND LEAD STRKSS

通过盆栽试验，比较分析了盐芥在Cd、Cu和Pb胁迫下盐芥幼苗生物量、重金属含量及富集系数等生理指标，以期探讨是否具有重金属超富集特性．结果表明，随着Cd、Cu和Pb处理浓度升高，盐芥的根长及干物质重量均显著下降，MDA均显著升高．与Cu和Pb相比，Cd处理浓度较低，盐芥受害最严重．Pb处理浓度最高，盐芥受害症状最不明显，说明盐芥对Pb具有一定的耐性．从盐芥对三种重金属的累积量来看，盐芥对Cd具有一定的累积作用，但在高浓度下（130mg‘kg。）很难存活，在Cu和Pb胁迫下能够完成正常的生活周期，但对Cu和Pb并不累积．所以盐芥对Cd污染土壤的修复具有一定的潜力，但不适宜用于Cu和Pb污染土壤的修复．

In this study, a pot experiment was used to investigate biomass, heavy metal contents and accumulation coefficient responses of halophyte Thellungiella Halophila under Cd, Cu and Pb stress. The result showed that the root length and dry mass decreased and MDA accumulated significantly with the increase of Cd, Cu and Pb concentrations. T. Halophila showed apparent injury symptoms under Cd treatment compared with Cu and Pb. T. halophila can grow well under Pb treatment though Pb treatment concentration was the highest,indicating it is Pb tolerant in some extent. From the point of accumulation coefficient, T. halophila can accumulate Cd below 130 mg ~ kg-~. However, T. halophila can not accumulate Cu and Pb though it can complete its life cycle under Cu and Pb stress. These results suggested that T. halophila has certain potential on remedying the soil polluted by Cd. But it is not suitable for remedying the soil polluted by Cu and Pb.