Is the effect of silicon on rice uptake of arsenate (As-v) related to internal silicon concentrations, iron plaque and phosphate nutrition?

文献类型： 外文期刊

第一作者： Guo, W.

作者： Guo, W.;Zhu, Y.-G.;Liu, W.-J.;Liang, Y.-C.;Geng, C.-N.;Wang, S.-G.

作者机构：

关键词： arsenate;iron plaque;kinetics uptake;phosphate;silicate

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

ISSN： 0269-7491

年卷期： 2007 年 148 卷 1 期

页码：

收录情况： SCI

摘要： Solution culture experiments were conducted to investigate the effects of silicon (Si) on arsenate (As-v) uptake by rice. The addition of Si to the pretreatment or uptake solution significantly decreased shoot and root As concentrations (P < 0.001 and P < 0.05). The presence of Si in the pretreatment or uptake solution also significantly decreased shoot P concentrations (P < 0.001). The data demonstrated that both internal and external Si inhibited the uptake of As and P. Results of As uptake kinetics showed that the mechanism of the effect of Si on arsenate uptake is not caused by direct competition for active sites of transporters with As. The effect of Si on As uptake was not entirely mediated through the effect of Si on P uptake. Although the addition of Si to pretreatment solutions still significantly decreased shoot and root As concentrations, the extent of reduction became smaller when rice roots were coated with iron plaque. (C) 2006 Elsevier Ltd. All rights reserved.

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