Hexavalent chromium uptake in rice ( Oryza sativa L.) mediated by sulfate and phosphate transporters OsSultr1;2 and OsPht1;1

文献类型： 外文期刊

第一作者： Li, Jingjing

作者： Li, Jingjing;Tang, Yetao;Qiu, Rongliang;Li, Jingjing;Xie, Weipeng;Qi, Hua;Qiu, Rongliang;Sun, Shengsheng;Deng, Tenghaobo

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关键词： Cr(VI); Uptake; Rice; Sulfate; Phosphate

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：12.2； 五年影响因子：11.9 ）

ISSN： 0304-3894

年卷期： 2024 年 478 卷

页码：

收录情况： SCI

摘要： Chromium (Cr) soil contamination is a critical global environmental concern, with hexavalent chromium (Cr [VI]) being especially perilous due to its high mobility, bioavailability, and phytotoxicity. This poses a significant threat to the cultivation of crops, particularly rice, where the mechanisms of Cr(VI) absorption remain largely unexplored. This study uncovered a competitive interaction between Cr(VI) and essential nutrients-sulfate and phosphate during the uptake process. Notably, deficiencies in sulfate and phosphate were associated with a marked increase in Cr(VI) accumulation in rice, reaching up to 76.5 % and 77.7 %, respectively. Employing qPCR, this study identified significant up-regulation of the sulfate transporter gene, OsSultr1;2, , and the phosphate transporter gene, OsPht1;1, , in response to Cr(VI) stress. Genetic knockout studies have confirmed the crucial role of OsSultr1;2 in Cr(VI) uptake, with its deletion leading to a 36.1 % to 69.6% decrease in Cr uptake by rice roots. Similarly, the knockout of OsPht1;1 resulted in an 18.1 % to 25.7 % decrease in root Cr accumulation. These findings highlight the key role of the sulfate transporter OsSultr1;2 in Cr(VI) uptake, with phosphate transporters also contributing significantly to the process. These insights are valuable for developing rice varieties with reduced Cr(VI) accumulation, ensuring the safety of rice grain production.

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