Although many studies have investigated the metabolism of selenium and arsenic in hyperaccumulating plants for phytoremediation purposes, few have explored non-hyperaccumulating plants as a model for general contaminant exposure to plants. In addition, the result of simultaneous supplementation with selenium and arsenic has not been investigated in plants. In this study, Chlorophytum comosum, commonly known as the spider plant, was used to investigate the metabolism of selenium and arsenic after single and simultaneous supplementation. Size exclusion and ion-pairing reversed phase liquid chromatography were coupled to an inductively coupled plasma mass spectrometer to obtain putative metabolic information of the selenium and arsenic species in C. comosum after a mild aqueous extraction. The chromatographic results depict that selenium and arsenic species were sequestered in the roots and generally conserved upon translocation to the leaves. The data suggest that selenium was directly absorbed by C. comosum roots when supplemented with Se(VI), but a combination of passive and direct absorption occurred when supplemented with Se(IV) due to the partial oxidation of Se(IV) to Se(VI) in the rhizosphere. Higher molecular weight selenium species were more prevalent in the roots of plants supplemented with Se(IV), but in the leaves of plants supplemented with Se(VI) due to an increased translocation rate. When supplemented as As(III), arsenic is proposed to be passively absorbed as As(III) and partially oxidized to As(V) in the plant root. Although total elemental analysis demonstrates a selenium and arsenic antagonism, a compound containing selenium and arsenic was not present in the general aqueous extract of the plant.

译文

:尽管许多研究已经为植物修复目的研究了超富集植物中硒和砷的代谢,但很少有人探索非超富集植物作为一般污染物暴露于植物的模型。另外,尚未在植物中研究同时补充硒和砷的结果。在这项研究中,一般被称为蜘蛛植物的吊兰(Chlorophytum comosum)用于研究单次和同时补充后硒和砷的代谢。将大小排阻和离子对反相液相色谱仪与电感耦合等离子体质谱仪耦合,以在温和的水提取后获得推定的C. comosum中硒和砷物种的推定代谢信息。色谱结果表明,硒和砷物质被隔离在根部,在转移到叶片时通常被保存下来。数据表明硒补充硒(VI)时会被骆驼毛根直接吸收,但是硒(IV)会部分氧化为硒(Se)时会发生被动吸收和直接吸收的结合。 VI)在根际中。较高分子量的硒物种在补充Se(IV)的植物根部更为普遍,但在增加Se(VI)的植物叶片中,由于提高了易位率。当砷被补充为砷(III)时,被提议以砷(III)的形式被被动吸收并在植物根部被部分氧化为砷(V)。尽管总元素分析显示了硒和砷的拮抗作用,但植物的普通水浸液中不存在含硒和砷的化合物。

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