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Can Liming Reduce Cadmium (Cd) A.ccumulation In Rice (Oryza S ativa) In Slightly Acidic Soils? A Contradictory Dynamic Equilibrium Between Cd Uptake Capacity Of Roots And Cd Immobilisation In Soils

文献类型: 外文期刊

作者: Chen, Jiangmin;Hu, Peisong;Wang, Jianlong;Yang, Yongjie;Tang, Shaoqing;Shao, Guosheng;Chen, Jiangmin;Huang, Qina

作者机构:

关键词: Rice; Cadmium; pH; Liming; Transport protein; Iron

期刊名称: CHEMOSPHERE

ISSN: 0045-6535

年卷期: 2018 年 193 卷

页码:

摘要: Cadmium (Cd) accumulation in rice is strongly controlled by liming, but information on the use of liming to control Cd accumulation in rice grown in slightly acidic soils is inconsistent. Here, pot experiments were carried out to investigate the mechanisms of liming on Cd accumulation in two rice varieties focusing on two aspects: available/exchangeable Cd content in soils that were highly responsive to liming, and Cd uptake and transport capacity in the roots of rice in terms of Cd accumulation-relative gene expression. The results showed that soil availability and exchangeable iron, manganese, zinc and Cd contents decreased with increased liming, and that genes related to Cd uptake (OsNramp5 and OsIRT1) were sharply up-regulated in the roots of the two rice varieties. Thus, iron, manganese, zinc and Cd contents in rice plants increased under low liming applications but decreased in response to high liming applications. However, yield and rice quantities were only slightly affected. These results indicated that Cd accumulation in rice grown in slightly acidic soils presents a contradictory dynamic equilibrium between Cd uptake capacity by roots and soil Cd immobilisation in response to liming. The enhanced Cd uptake capacity under low liming dosages increases risks to human health. (C) 2017 Elsevier Ltd. All rights reserved.

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