Physiological and Biochemical Mechanisms of Exogenous Melatonin Regulation of Saline-Alkali Tolerance in Oats

文献类型： 外文期刊

第一作者： Wang, Qiang

作者： Wang, Qiang;Xu, Weiwei;Ren, Changzhong;Zhan, Chao;Wang, Chunlong;Li, Junwei;Ren, Qinyong;Liang, Xiaotian;Wei, Liming;Guo, Laichun;Wang, Qiang;Xiang, Dabing;Guo, Laichun;Xu, Weiwei;Ren, Qinyong;Liang, Xiaotian;Wang, Junying

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关键词： saline-alkali; melatonin; oat; germination; antioxidant enzyme activity

期刊名称：AGRONOMY-BASEL （ 影响因子：3.7； 五年影响因子：4.0 ）

ISSN：

年卷期： 2023 年 13 卷 5 期

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收录情况： SCI

摘要： Saline-alkali stress is one of the major factors limiting oat seed germination. The regulatory role of melatonin (MT) as a naturally occurring active substance is well known, but the mechanism of MT-mediated intrinsic physiological regulation of oat seed germination under saline-alkali stress is unclear. Therefore, this study investigated (1) the variability of different MT seed soaking concentrations and times on the germination of oat seeds under saline-alkali stress, and (2) the possible physiological regulatory mechanisms of MT on the germination of oat seeds under saline-alkali stress. The results showed that seed vigor was significantly reduced under saline-alkali stress, and seed germination of oats was significantly inhibited; different concentrations of MT seed soaking treatments improved the germination rate, germination potential, germination index, vigor index, root length, germ length, fresh weight, and dry weight; and, overall, treatment improved seed germination and exhibited the phenomenon of "low promotion and high inhibition". The 100 mu mol.L-1 MT seed soaking treatment effectively enhanced the activities of seed antioxidant enzymes (SOD, POD, CAT, and APX) and nonenzymatic antioxidants (GSH and AsA), affected the AsA-GSH cycle, and effectively increased the contents of osmoregulatory substances (proline, protein, and soluble sugar) by reducing levels of H2O2, OH-, and MDA, thus enhancing the tolerance of oats to saline-alkali and promoting seed germination. In conclusion, MT has a positive effect on the saline-alkali tolerance of oat seeds.

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