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首页> 美国卫生研究院文献>Plant Physiology >The Distribution of Arsenate and Arsenite in Shoots and Roots of Holcus lanatus is Influenced by Arsenic Tolerance and Arsenate and Phosphate Supply
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The Distribution of Arsenate and Arsenite in Shoots and Roots of Holcus lanatus is Influenced by Arsenic Tolerance and Arsenate and Phosphate Supply

机译：砷的芽和根中砷和亚砷的分布。 中华绒螯蟹受砷耐受性和砷酸盐的影响 磷酸盐供应

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The recent discovery that phytochelatins are important for arsenic (As) detoxification in terrestrial plants results in the necessity to understand As speciation and metabolism in plant material. A hydroponic study was therefore conducted to examine the effects of different levels of phosphate and arsenate [As(V)] on As speciation and distribution in tolerant and non-tolerant clones of Holcus lanatus. Speciation of As in tissue (using high-performance liquid chromatography-inductively coupled plasma mass spectrometry) revealed that the predominant species present were the inorganic As species (As(V) and arsenite [As(III)]), although small levels (<1%) of organic As species (dimethylarsinic acid and monomethylarsonic acid) were detected in shoot material. In roots, the proportion of total As present as As(III) generally increased with increasing levels of As(V) in the nutrient solution, whereas in shoots, the proportion of total As present as As(III) generally decreased with increasing levels of As(V). H. lanatus plants growing in the high-phosphorus (P) (100 μm) solution contained a higher proportion of As(V) (with regard to total As) in both roots and shoots than plants supplied with low P (10 μm); in addition, tolerant clones generally contained a higher proportion of As(V) with regard to total As than non-tolerant clones. The study further revealed that As(V) can be reduced to As(III) in both roots and shoots. Although the reduction capacity was limited, the reduction was closely regulated by As influx for all treatments. The results therefore provide a new understanding about As metabolism in H. lanatus.
机译：最近发现植物螯合素对于陆生植物中的砷（As）解毒很重要，这导致有必要了解植物材料中的As形态和代谢。因此，进行了一项水培研究，以研究不同水平的磷酸盐和砷酸盐[As（V）]对宽容和不宽容Holcus lanatus克隆中As形态和分布的影响。组织中As的形态（使用高效液相色谱-电感耦合等离子体质谱法）显示，尽管含量小（，但存在的主要物质是无机As物质（As（V）和亚砷酸盐[As（III）]）。在苗料中检测到1％的有机砷物质（二甲基ar酸和一甲基ar酸）。在根部，以As（III）形式存在的总As的比例通常随着营养液中As（V）含量的增加而增加，而在枝条中，以As（III）形式存在的总As的比例通常随着As（III）含量的增加而降低。 As（V）。在高磷（P）（100μm）溶液中生长的H. lanatus植物在根部和枝条中所含的As（V）（相对于总As）的比例要高于低磷（10μm）的植物。此外，耐性克隆 通常，As（V）在总As中所占的比例比 非耐受性克隆。研究进一步表明，As（V）可以还原为 根和茎中都含有As（III）。尽管还原能力有限， 对于所有治疗方法，其减少都受到砷流入的严格控制。的 因此，结果为H中As代谢提供了新的认识。 拉纳图斯。

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