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

文献类型： 外文期刊

作者： Kong, Xiangying 1 ; Peng, Zhongping 1 ; Li, Dongxu 1 ; Ma, Wenna 1 ; An, Ruidong 1 ; Khan, Dawood 1 ; Wang, Xinxun 3 ; Li 1 ;

作者机构： 1.Kunming Univ Sci & Technol, Fac Life Sci & Technol, Jingming South Rd, Kunming 650500, Yunnan, Peoples R China

2.Kunming Univ Sci & Technol, Fac Architecture & City Planning, Jingming South Rd, Kunming 650500, Yunnan, Peoples R China

3.Univ Western Australia, UWA Sch Agr & Environm, Fac Sci, 35 Stirling Highway, Perth, WA 6009, Australia

4.Guangdong Acad Agr Sci, Vegetable Res Inst, Guangzhou 501640, Peoples R China

5.Fujian Agr & Forestry Univ, Int Magnesium Inst, Fuzhou 350002, Peoples R China

6.Inst Adriat Crops & Karst Reclamat, Put Duilova 11, Split 21000, Croatia

7.Yunnan Rural Sci & Technol Serv Ctr, Kunming 650021, Yunnan, Peoples R China

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

年卷期：

页码：

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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