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PHYSIOLOGICAL MECHANISM OF MELATONIN REGULATION IN SOYBEANS UNDER ALUMINUM STRESS

文献类型： 外文期刊

作者： Huang, Ping 1 ; Huang, Shoucheng 1 ; Zhang, Qi'An 2 ; Yan, Congsheng 2 ; Lu, Xiaomin 1 ;

作者机构： 1.Anhui Sci & Technol Univ, Coll Life & Hlth Sci, Fengyang 233100, Peoples R China

2.Anhui Acad Agr Sci, Inst Hort, Hefei 230031, Anhui, Peoples R China

关键词： Soybean; Aluminum stress; Melatonin; Antioxidant system; Photosynthesis

期刊名称：PAKISTAN JOURNAL OF BOTANY （ 影响因子：0.972； 五年影响因子：0.988 ）

ISSN： 0556-3321

年卷期： 2018 年 50 卷 4 期

页码：

收录情况： SCI

摘要： Aluminum (Al) is one of the main toxicants that affect crop growth in acidic soils. Melatonin (MT) is an important steroidal hormone that can increase the plant's stress resistance. However, the regulatory mechanism of Al stress in plants remains unclear. This study investigated the effects of MT on the growth, antioxidant system, and photosynthesis of soybean seedlings under Al stress. Results showed that, compared with the control group, Al stress resulted in lower superoxide dismutase, catalase, and peroxidase activity, increased accumulation of malondialdehyde in the leaves of soybean seedlings, increased membrane permeability, and significant decrease in the photosynthetic rate, transpiration rate, and stomatal conductance of seedlings. The fresh weight and dry weight of the seedlings decreased by 22.0% and 18.1%, respectively, and the growth was significantly inhibited. Foliar application of MT could effectively increase the anti-oxidative enzyme activity of soybean seedlings under Al stress, reduce the degree of membrane lipid peroxidation, relieve Al damage to chloroplast PSII, enhance its photosynthetic performance, and significantly increase the dry weight and fresh weight of the seedlings. Consequently, the damage caused by Al stress was effectively alleviating and the growth of seedlings was promoted.

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