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Localizing the biochemical transformations of arsenate in a hyperaccumulating fern

机译:在高积累的蕨类中定位砷酸盐的生化转化

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The fern Pteris vittata accumulates unusually high levels of arsenic. Using X-ray absorption spectroscopy (XAS) and XAS imaging, we reveal the distribution of arsenic species in vivo. Arsenate is transported through the vascular tissue from the roots to the fronds ( leaves), where it is reduced to arsenite and stored at high concentrations. Arsenic-thiolate species surrounding veins may be intermediates in this reduction. In gametophytes, arsenite is compartmentalized within the cell vacuole. Arsenic is excluded from cell walls, rhizoids, and reproductive areas. This study provides important insights into arsenic hyperaccumulation, which may prove useful for phytoremediating arsenic-contaminated sites, and demonstrates the strengths of XAS imaging for distinguishing highly localized species.
机译:蕨类植物蕨类植物中砷的含量异常高。使用X射线吸收光谱(XAS)和XAS成像,我们揭示了体内砷物种的分布。砷酸盐通过血管组织从根部传输到叶状体(叶),然后还原为砷酸盐并以高浓度存储。静脉周围的硫代砷酸物质可能是这种还原的中间产物。在配子体中,亚砷酸盐在细胞液泡中分隔。砷被排除在细胞壁,根状茎和生殖区域之外。这项研究提供了砷超富集的重要见解,可能被证明对植物修复受砷污染的位点有用,并证明了XAS成像在区分高度局限性物种方面的优势。

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