Effects of Plant Regulators on the Seed Germination and Antioxidant Enzyme Activity of Cotton under Compound Salt Stress

文献类型： 外文期刊

第一作者： Dong, Zhiduo

作者： Dong, Zhiduo;Huang, Jian;Qi, Tong;Meng, Ajing;Fu, Yanbo;Dong, Zhiduo;Fu, Qiuping;Huang, Jian;Qi, Tong;Meng, Ajing;Qi, Tong;Fu, Yanbo

作者机构：

关键词： 24-epibrassinolide; Gossypium; natural composite salts; physiological activity; seedling

期刊名称：PLANTS-BASEL （ 影响因子：4.5； 五年影响因子：4.8 ）

ISSN： 2223-7747

年卷期： 2023 年 12 卷 24 期

页码：

收录情况： SCI

摘要： Salinity stress significantly hampers cotton seed germination and seedling growth. Employing plant growth regulators stands out as an effective strategy to mitigate salt stress. In this study, we assessed the impact of varying concentrations of natural composite salt conditions (0%, 0.6%, and 1.2%) on cotton seed germination, seedling growth, and physiology. Additionally, we explored the effects of compound sodium nitrophenolate (CSN: 2 mgL-1 and 10 mgL-1), 24-epibrassinolide (EBR: 0.02 mgL-1 and 0.1 mgL-1), and gibberellic acid (GA: 60 mgL-1 and 300 mgL-1), against a control (CK: distilled water) group. The results indicate that with an increase in the composite salt concentration, the germination potential (GP) and germination rate (GR) of cotton seeds gradually decrease. Simultaneously, the fresh weight and root vitality of seedlings also correspondingly decrease, while the degree of membrane lipid peroxidation increases. Under high-salt (1.2%) conditions, soaking treatments with CSN and EBR significantly enhance both GP (45-59% and 55-64%) and GR (30-33% and 39-36%) compared to the CK. However, the GA treatment does not increase the GP and GR of cotton. Moreover, under high-salt (1.2%) conditions, CSN and EBR treatments result in the increased activities of superoxide dismutase (56-66% and 71-80%), peroxidase (20-24% and 37-51%), and catalase (26-32% and 35-46%). Consequently, cotton exhibits a relatively good tolerance to natural composite salts. Soaking treatments with CSN and EBR effectively improve cotton germination by enhancing antioxidant enzyme activities, thereby strengthening cotton's tolerance to salt stress. These findings offer new insights for enhancing the salt tolerance of cotton.

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