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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Root Responses and Metal Accumulation in Two Contrasting Ecotypes of Sedum Alfredii Hance Under Lead and Zinc Toxic Stress
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Root Responses and Metal Accumulation in Two Contrasting Ecotypes of Sedum Alfredii Hance Under Lead and Zinc Toxic Stress

机译：铅锌毒害下两种不同生态型东南景天的根系响应和金属积累

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摘要

Sedum alfredii Hance has been reported to be a Zn-hyperaccumulator plant species. In this study, root morphological and physiological response of the hyperaccumulating ecotype of S. alfredii H. (HE) from the mined area and the non-hyperaccumulating ecotype of S. alfredii H. (NHE) from the agricultural area to supplied levels of Zn and Pb were investigated. The results showed that Zn concentrations in the leaves and the stems of the HE were 34 and 41 times higher, whereas lead concentrations were 1.9 and 2.4 times greater, respectively, than those of the NHE when grown at 1224 μM Zn and/or 200 μM Pb. At combined supply of 1224 μM Zn with 200 μM Pb, however, zinc concentrations in the stems and leaves of the, HE decreased, while lead concentrations in the stems increased significantly, as compared with those of single metal treatment. Lead uptake of the HE was enhanced by Zn addition. Root activity of the HE decreased by Pb treatment in the first two days, but recovered afterward and close to the control at day 10 of the treatment. However, root activity of the NHE decreased by each metal treatment, and was not recovered with the advance of treatment time. Root length, root surface area, and root volumes increased obviously due to Zn and/or Pb/Zn combined treatments for the HE, but significantly decreased due to Pb, Zn, or Pb/Zn combined treatment for the NHE. Zinc and Pb concentrations in both ecotypes of S. alfredii H. were positively correlated with root length, root surface area, and root volumes. Root exudates of the HE, especially treated with Zn, increased the extractability of Pb and Zn from the mined soil. At the Zn supply level of 1224 μM, the extractability of root exudates on soil Pb was 3-12 times greater for the HE than for the NHE. These results imply that the tolerance and hyperaccumulation of the hyperaccumulating ecotype of S. alfredii H. to Zn and Pb appear to be closely related to its high adaptation of root growth, morphology, and physiology to Pb and Zn toxicity, and through its root excretion of some special substances that can activate Pb and Zn in the mined soil, thus increasing their mobilization and bioavailability.
机译：据报道，景天景天是锌超积累植物。在这项研究中，矿区S. alfredii H.（HE）的过度富集生态型和农区非S. alfredii H.（NHE）的过度富集生态型对锌供应水平的根系形态和生理响应和铅进行了调查。结果表明，当在1224μMZn和/或200μM下生长时，HE叶片和茎中的Zn浓度分别比NHE的高39倍和41倍，而铅的含量分别比NHE高1.9倍和2.4倍。铅然而，与单金属处理相比，在联合供应1224μMZn和200μMPb时，HE的茎和叶中的锌浓度下降，而茎中的铅浓度显着增加。锌的添加提高了HE对铅的吸收。 HE的根系活性在开始的两天内通过Pb处理而降低，但是随后恢复并且在处理的第10天接近对照。但是，每次金属处理后，NHE的根系活性均下降，并且随着处理时间的延长而无法恢复。根部长度，根部表面积和根部体积由于HE的Zn和/或Pb / Zn联合处理而明显增加，但由于NHE的Pb，Zn或Pb / Zn联合处理而明显减少。两种生态型S. alfredii H.的锌和Pb浓度与根长，根表面积和根体积成正相关。 HE的根系分泌物，尤其是用Zn处理的根系分泌物，增加了从开采的土壤中铅和锌的提取能力。在锌供应水平为1224μM时，HE上根系分泌物在Pb上的萃取能力比NHE高3-12倍。这些结果表明，S。alfredii H.对锌和Pb的过度富集生态型的耐受性和过度富集似乎与其对根系生长，形态和生理学对Pb和Zn毒性的高度适应以及通过其根系排泄密切相关。一些可以激活矿山土壤中铅和锌的特殊物质，从而增加了它们的动员能力和生物利用度。

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