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Glutamate Alleviates Cadmium Toxicity In Rice Via Suppressing Cadmium Uptake And Translocation

文献类型： 外文期刊

作者： Li, Mei;Jiang, Meng;Jiang, Jie;Li, Shan;Huang, Jianzhong;Shu, Qingyao;Jiang, Meng;Huang, Jianzhong;Jiang, Meng;Tan, Yuanyuan;Li, Mei;Shu, Qingyao;Song, Shiyong;Li, Shan

作者机构：

关键词： Cadmium Toxicity; Chlorophyll; Glutamate; Oxidative Stress; Rice (Oryza Saliva L.)

期刊名称： JOURNAL OF HAZARDOUS MATERIALS

ISSN： 0304-3894

年卷期： 2020 年 384 卷

页码：

摘要： Cadmium (Cd), a naturally occurring heavy metal, is toxic to animals and plants. Minimization of Cd in rice grain is important to human health since rice is the main source of Cd intake for human populations feeding on it as staple food. Glutamate (Glu) is reportedly involved in plant abiotic stress responses, whereas the underlying molecular mechanism remains poorly understood. In this study, we showed that supplement of Glu, but not glutamine, significantly alleviated Cd toxicity in hydroponically grown rice plants. Cd accumulation was reduced by 44.1% and 65.6% in root and shoot of rice plants respectively, after Glu supplementation (3 mM). Glu supplement restored chlorophyll biosynthesis and significantly ameliorated Cd-induced oxidative stress with reduced levels of H2O2, O-1(2), MDA, and increased activities of major anti-oxidant enzymes, catalase, peroxidase and glutathione S-transferase. Levels of stress-associated free amino acids proline, arginine and gamma-aminobutyric acid were also reduced after Glu supplement. We further demonstrated that Glu supplement suppressed the Cd-induced expression of metal transporter genes OsNramp1, OsNramp5, OsIRT1, OsIRT2, OsHMA2 and OsHMA3 in roots of Cd-treated plants. Taken together, our results suggest that Glu supplement could alleviate Cd toxicity in rice by suppressing Cd uptake and translocation.

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