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The Physiological Mechanism of Exogenous Melatonin Regulating Salt Tolerance in Eggplant Seedlings

文献类型： 外文期刊

作者： Zhang, Yu 1 ; Jia, Li 2 ; Wang, Han 2 ; Jiang, Haikun 2 ; Ding, Qiangqiang 2 ; Yang, Dekun 1 ; Yan, Congsheng 2 ; Lu, Xiaomin 1 ;

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

2.Anhui Acad Agr Sci, Inst Vegetables, Hefei 230001, Peoples R China

3.Key Lab Hort Crop Germplasm Innovat & Utilizat Coc, Hefei 230001, Peoples R China

4.Anhui Prov Key Lab Germplasm Resources Creat & Hig, Hefei 230001, Peoples R China

关键词： exogenous melatonin; eggplant seedlings; mitigation effect; secondary salinization

期刊名称：AGRONOMY-BASEL （ 影响因子：3.4； 五年影响因子：3.8 ）

ISSN：

年卷期： 2025 年 15 卷 2 期

页码：

收录情况： SCI

摘要： There is little study on melatonin's ability to prevent salt damage in eggplants, despite the fact that it is a strong antioxidant in plants that has been found to help mitigate a variety of adverse challenges. In this study, we used "Anhui Eggplant No.8" as the test material and simulated salt stress by irrigating the roots with 150 mmolL NaCl solution. Subsequently, we treated the eggplants with different concentrations of exogenous melatonin (0, 50, 100, 150, 200, 250 mu molL) and assessed the plant traits and an array of physiological and biochemical indices following melatonin application to observe the impact of salt stress. Our study results indicate that exogenous melatonin at a concentration of 200 mu molL can significantly alleviate the inhibition of eggplant photosynthesis under salt stress by increasing the content of chlorophyll in leaves and the activity of antioxidant enzymes. This leads to a notable increase in the levels of non-enzyme antioxidants and osmotic regulatory substances. As a result, the antioxidant capacity of the eggplants is enhanced, the degree of membrane lipid peroxidation is reduced, and the growth of eggplant seedlings under salt stress is effectively promoted, thereby strengthening the salt tolerance of eggplant seedlings. Fluorescence quantitative data analysis indicates that SmCAT4 is indeed a gene that positively regulates salt stress. However, in the SmPPO family, we did not find any genes that respond to salt stress. This research provides a theoretical foundation for improving the yield productivity and quality of eggplants under protected farming by clarifying the physiological mechanism by which melatonin controls the salt tolerance of eggplant seedlings.

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