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Increasing soil Mn abundance promotes the dissolution and oxidation of Cr (III) and increases the accumulation of Cr in rice grains

文献类型： 外文期刊

作者： Ao, Ming 1 ; Deng, Tenghaobo 2 ; Sun, Shengsheng 1 ; Li, Mengyao 1 ; Li, Jingjing 4 ; Liu, Ting 4 ; Yan, Bofang 1 ; Liu, Wen-Shen 1 ; Wang, Guobao 1 ; Jing, Dedao 6 ; Chao, Yuanqing 1 ; Tang, Yetao 1 ; Qiu, Rongliang 1 ; Wang, Shizhong 1 ;

作者机构： 1.Sun Yat Sen Univ, Sch Environm Sci & Engn, Guangdong Prov Key Lab Environm Pollut Control & R, Guangzhou 510006, Peoples R China

2.Guangdong Acad Agr Sci, Inst Qual Stand & Monitoring Technol Agroprod, Guangzhou 510640, Peoples R China

3.Sun Yat Sen Univ, Guangdong Prov Engn Res Ctr Heavy Met Contaminated, Guangzhou 510006, Peoples R China

4.South China Agr Univ, Coll Nat Resources & Environm, Guangdong Prov Key Lab Agr & Rural Pollut Abatemen, Guangzhou 510642, Peoples R China

5.Guangdong Lab Lingnan Modern Agr, Guangzhou 510642, Peoples R China

6.Zhenjiang Inst Agr Sci Hilly Reg Jiangsu, Jurong 212400, Peoples R China

关键词： Chromium; Rice; Cr(VI); Mn(III; IV) oxides

期刊名称：ENVIRONMENT INTERNATIONAL （ 影响因子：11.8； 五年影响因子：12.4 ）

ISSN： 0160-4120

年卷期： 2023 年 175 卷

页码：

收录情况： SCI

摘要： Hexavalent chromium (Cr(VI)) is more readily taken up by plants than trivalent chromium (Cr(III)) due to its similar chemical structure to phosphate and sulfate. In paddy soils, Cr(VI) of natural origin are mainly produced from Cr(III) oxidized by O2 and Mn(III/IV) oxides, which are affected by rice radial oxygen loss (ROL) and Mn (II)-oxidizing microorganisms (MOM). However, little is known about the effect of ROL and Mn abundance on rice Cr uptake. Here, we investigated the effects on Cr(VI) generation and the subsequent Cr uptake and accumulation with the involvement of two rice cultivars with distinct ROL capacities by increasing soil Mn abundance. Results showed that Mn(II) addition to the soil led to more Cr(III) being released into the pore water, and the dissolved Cr(III) was oxidized to Cr(VI) by ROL and biogenic Mn(III/IV) oxides. The concentration of Cr(VI) in soil and pore water increased linearly with the addition of Mn(II) doses. Mn(II) addition promoted the root-toshoot translocation and grain accumulation of Cr derived mainly from newly generated Cr(VI) in the soil. These results emphasize that rice ROL and MOM promote the oxidative dissolution of Cr(III) at a high level of soil Mn, resulting in more Cr accumulation in rice grains and increasing dietary Cr exposure risks.

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