Physiological and metabolomic insights into molecular mechanisms of root sensitivity to zinc toxicity in rice (Oryza sativa L.)

文献类型： 外文期刊

第一作者： Wang, Yin

作者： Wang, Yin;Miao, Miao;Fang, Hao;Zheng, Yanran;Liu, Lei;Gu, Xingguo;Xu, Xiaoxiao;Tang, Yong;Lai, Qixian;Wang, Yin;Miao, Miao;Fang, Hao;Zheng, Yanran;Liu, Lei;Gu, Xingguo;Tang, Yong;Lai, Qixian;Xu, Xiaoxiao;Liu, Xunyue;Shu, Xiaoli;Shu, Xiaoli

作者机构：

关键词： Zinc (Zn); Toxicity; Rice; Metabolomics; Metabolic pathway

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：11.3； 五年影响因子：12.4 ）

ISSN： 0304-3894

年卷期： 2025 年 492 卷

页码：

收录情况： SCI

摘要： Zinc (Zn) is an essential micronutrient for plants, but excessive concentrations induce cytotoxicity. As one of the world's primary crops, rice's response mechanisms to Zn toxicity remain poorly understood. In this study, we characterized a rice mutant, NG3-6, which exhibited enhanced sensitivity to Zn toxicity compared to the wild type (WT). At Zn concentrations of 40 mu M and above, NG3-6 displayed severe toxicity symptoms, including reduced primary root length, plant height, and dry weight, whereas the WT plants maintained normal growth until Zn concentrations exceeded 400 mu M. The mutant demonstrated a higher Zn uptake capacity in roots, leading to increased Zn accumulation across all tissues. This higher Zn accumulation was correlated with elevated reactive oxygen species (ROS) production. Zn toxicity induced the accumulation of oxidative stress-related metabolites, such as L-proline, glutathione, and water-soluble sugars, in both the mutant and WT. However, NG3-6 showed distinct metabolic alterations in response to high Zn treatment, including significant accumulation of certain metabolites associated with the pentose phosphate pathway, amine biosynthesis, and benzoic acid-related pathways, concurrent with reduced flavonoid biosynthesis. These findings advance our understanding of the molecular mechanisms underlying root adaptive strategies to Zn toxicity in plants.

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