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首页> 外文期刊>The New Phytologist >Rapid reduction of arsenate in the medium mediated by plant roots
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Rapid reduction of arsenate in the medium mediated by plant roots

机译：植物根系介导的培养基中砷的快速还原

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Microbes detoxify arsenate by reduction and efflux of arsenite. Plants have a high capacity to reduce arsenate, but arsenic efflux has not been reported. Tomato (Lycopersicon esculentum) and rice (Oryza sativa) were grown hydroponically and supplied with 10 microm arsenate or arsenite, with or without phosphate, for 1-3 d. The chemical species of As in nutrient solutions, roots and xylem sap were monitored, roles of microbes and root exudates in As transformation were investigated and efflux of As species from tomato roots was determined. Arsenite remained stable in the nutrient solution, whereas arsenate was rapidly reduced to arsenite. Microbes and root exudates contributed little to the reduction of external arsenate. Arsenite was the predominant species in roots and xylem sap. Phosphate inhibited arsenate uptake and the appearance of arsenite in the nutrient solution, but the reduction was near complete in 24 h in both -P- and +P-treated tomato. Phosphate had a greater effect in rice than tomato. Efflux of both arsenite and arsenate was observed; the former was inhibited and the latter enhanced by the metabolic inhibitor carbonylcyanide m-chlorophenylhydrazone. Tomato and rice roots rapidly reduce arsenate to arsenite, some of which is actively effluxed to the medium. The study reveals a new aspect of As metabolism in plants.
机译：微生物通过砷的还原和外排使砷酸盐解毒。植物具有高的减少砷酸盐的能力，但尚未报道砷的外流。番茄（Lycopersicon esculentum）和水稻（Oryza sativa）进行水培栽培，并向其中加入10微米砷酸盐或亚砷酸盐（有或没有磷酸盐），持续1-3天。监测营养液，根和木质部汁液中砷的化学物种，研究微生物和根系分泌物在砷转化中的作用，并确定番茄根中砷的外排。营养液中的亚砷酸盐保持稳定，而砷酸盐迅速还原为亚砷酸盐。微生物和根系分泌物对减少外部砷化物的贡献很小。砷是根和木质部树液中的主要物种。磷酸盐抑制了营养液中砷的吸收和砷的出现，但在-P-和+ P处理的番茄中，还原均在24小时内完成。磷酸盐在大米中的作用大于番茄。观察到亚砷酸盐和砷酸盐的外排;前者被代谢抑制剂羰基氰化物间氯苯hydr所抑制，后者被增强。番茄和水稻的根迅速将砷酸盐还原为亚砷酸盐，其中一些被积极地排入培养基。该研究揭示了植物中砷代谢的新方面。

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