Magnesium decreases aluminum accumulation and plays a role in protecting maize from aluminum-induced oxidative stress

文献类型： 外文期刊

第一作者： Kong, Xiangying

作者： Kong, Xiangying;Peng, Zhongping;Li, Dongxu;Ma, Wenna;An, Ruidong;Khan, Dawood;Liu, Yuan;Yang, En;Chen, Qi;Kong, Xiangying;Wang, Xinxun;Rengel, Zed;Chen, Qi;He, Yuzhi;Zhang, Baige;Wu, Liqngquan;Rengel, Zed;Wang, Jianmin

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关键词： Mg; Al toxicity; Maize; H2O2; Antioxidative enzymes

期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）

ISSN： 0032-079X

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收录情况： SCI

摘要： Background Acidic soils with a pH(water)below 5.5 occupy up to 40% of world's arable land. Aluminum (Al) toxicity and magnesium (Mg) deficiency often coexist in acidic soils, limiting crop production. In this study, we investigated a role of Mg in alleviation of Al stress in maize (Zea mays) by characterizing the growth responses, Al accumulation and the antioxidant properties of plants cultured hydroponically. Methods Physiological and molecular analyses were used to investigate the mechanisms of Mg governing the alleviation of Al-induced ROS production and root growth inhibition. Results Aluminum (50 mu M) decreased root growth and induced oxidative stress. Exogenously added millimolar concentrations of Mg significantly alleviated Al toxicity as evidenced by restoration of plant growth, suppression of Al uptake, and a decline in root H(2)O(2)concentration. Furthermore, the addition of Mg to the Al treatment solution enhanced the activities and expression of genes encoding superoxide dismutase, catalase and peroxidase compared to the Al-only treatment. Conclusions The results indicate that Mg plays a role in alleviation of Al toxicity, reduction of Al accumulation and protection from Al-induced oxidative stress through activation of antioxidative enzymes.

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