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首页> 外文期刊>Environmental Science & Technology >Difference of Toxicity and Accumulation of Methylated and Inorganic Arsenic in Arsenic-Hyperaccumulating and -Hypertolerant Plants
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Difference of Toxicity and Accumulation of Methylated and Inorganic Arsenic in Arsenic-Hyperaccumulating and -Hypertolerant Plants

机译：砷超积累和超耐受植物中甲基化和无机砷的毒性和积累差异

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摘要

The arsenic (As) hyperaccumulators, Pteris vittata and Pteris cretica and an As-tolerant plant Boehmeria nivea, were selected to compare the toxicity, uptake, and transportation of inorganic arsenate (As(V)) and its methylated counterpart dimethylarsinic acid (DMA). The XANES method was used to elucidate the effect of As species transformation on As toxicity and accumulation characteristics. Significantly higher toxicity and lower accumulation of DMA than inorganic As(V) was shown in the As hyperaccumulators and the As-tolerant plant. Reduction of As(V) was commonly found in the plants. Arsenic complexation with thiols, which have less mobility in plants and usually occur in As-tolerant plants, was also found in rhizoids of P. cretica. Plants with greater ability to form As-thiolate have lower ability for upward transport of As. Demethylation of DMA occurred in the three plants. The DMA component decreased from the rhizoids to the fronds in both hyperaccumulators, while this tendency is reverse in B. nivea.
机译：选择砷（As）超富集剂，凤尾蕨（Pteris vittata）和凤尾蕨（Pteris cretica）以及耐As的植物Boehmeria nivea，以比较无机砷酸盐（As（V））及其甲基化的二甲基砷化砷（DMA）的毒性，吸收和转运。 。 XANES方法用于阐明As物种转化对As毒性和积累特性的影响。在超富集砷和耐砷植物中显示出比无机砷（V）更高的毒性和更低的DMA累积。 As（V）的还原通常在植物中发现。在cr草的根状茎中也发现了砷与硫醇的络合物，在植物中的移动性较小，通常发生在耐As的植物中。具有较高能力形成As-硫醇盐的植物具有较低的As向上运输能力。在这三个工厂中发生了DMA脱甲基。在两个超级蓄积器中，DMA成分都从根状体减少到叶状体，而在妮维雅双歧杆菌中这种趋势是相反的。

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