Mechanism for Fe(III) to decrease cadmium uptake of wheat plant: Rhizosphere passivation, competitive absorption and physiological regulation

文献类型： 外文期刊

第一作者： Duan, Xianjie

作者： Duan, Xianjie;Liu, Ling;Lu, Tao;Wang, Sheliang;Wang, Chuang;Qiu, Guohong;Qiu, Guohong;Wang, Chuang;Qiu, Guohong

作者机构：

关键词： Cadmium; Iron; Wheat; Rhizosphere passivation; Competitive absorption; Physiological regulation

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：9.8； 五年影响因子：9.6 ）

ISSN： 0048-9697

年卷期： 2024 年 931 卷

页码：

收录情况： SCI

摘要： The presence of dissolved Fe(III) and Fe(III)-containing minerals has been found to alleviate cadmium (Cd) accumulation in wheat plants grown in Cd-contaminated soils, but the specific mechanism remains elusive. In this work, hydroponic experiments were conducted to dissect the mechanism for dissolved Fe(III) (0 - 2000 mu mol L (-1) ) to decrease Cd uptake of wheat plants and study the influence of Fe(III) concentration and Cd(II) pollution level (0 - 20 mu mol L (-1) ) on the Cd uptake process. The results indicated that dissolved Fe(III) significantly decreased Cd uptake through rhizosphere passivation, competitive absorption, and physiological regulation. The formation of poorly crystalline Fe(III) oxides facilitated the adsorption and immobilization of Cd(II) on the rhizoplane (over 80.4 %). In wheat rhizosphere, the content of CaCl (2) -extractable Cd decreased by 52.7 % when Fe(III) concentration was controlled at 2000 mu mol L (-1) , and the presence of Fe(III) may reduce the formation of Cd(II)-organic acid complexes (including malic acid and succinic acid secreted by wheat roots), which could be attributed to competitive reactions. Down -regulation of Cd uptake genes ( TaNramp5-a and TaNramp5-b ) and transport genes ( TaHMA3-a , TaHMA3-b and TaHMA2 ), along with up -regulation of the Cd efflux gene TaPDR84A7A , contributed much to the reduction of Cd accumulation in wheat plants in the presence of Fe(III). The inhibitory effect of Fe(III) on Cd uptake and transport in wheat plants declined with increasing Cd(II) concentration, particularly at 20 mu mol L (-1) . This work provides important implications for remediating Cd-contaminated farmland soil and ensuring the safe production of wheat by using dissolved Fe(III) and Fe(III)-containing minerals.

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