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Abstract <p>Salt and alkali stresses are major environmental factors that severely affect plant growth and development, while melatonin (MT) is involved in plant response under abiotic stresses. This study aimed to investigate the regulatory effects of exogenous MT on seed initiation and physiological and biochemical processes in <i>Sophora alopecuroides</i> L. under salt and alkali stresses, with a focus on understanding the underlying response mechanisms. The results showed that the germination rate, germination potential, germination index, and vigour index were improved after melatonin solution soaking. Additionally, MT-treated seedlings exhibited enhanced growth under both types of stress, with a notable increase in photosynthetic efficiency, thereby improving the plant’s nutritional status. MT also facilitated osmotic regulation and elevated antioxidant enzyme activity, which effectively mitigated reactive oxygen species (ROS) accumulation. After the cluster correlation analysis, principal component analysis, and the comprehensive analysis of the affiliation function among the indexes, the effect of applying 50 μmol/L MT in salt stress was the most obvious, and it could significantly improve the growth indexes of the seedlings; The best impact of alkali stress was achieved by applying 100 μmol/L MT treatment, which was effective in resisting the toxicity produced by the stress, and we found that alkali stress had a more significant effect on seed germination and seedling growth of <i>Sophora alopecuroides</i> seeds. Exogenous MT was found to promote at low concentrations and inhibit at 250 μmol/L high concentrations in seedlings under both stresses. This study underscores the beneficial effects of exogenous MT in enhancing seed germination, osmoregulation, antioxidant enzyme activity, and photosynthetic pigment levels in <i>Sophora alopecuroides</i> under salt and alkali stresses.</p>

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Regulatory Effect of Exogenous Melatonin on Seed Priming, Seedling Growth and Antioxidant Defence System of Sophora alopecuroides under Compound Salt Stress and Compound Alkali Stress

  • 期刊论文

  • 发表日期：

    2025年7月5日

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  • Y. W. Zhang

摘要

Abstract

Salt and alkali stresses are major environmental factors that severely affect plant growth and development, while melatonin (MT) is involved in plant response under abiotic stresses. This study aimed to investigate the regulatory effects of exogenous MT on seed initiation and physiological and biochemical processes in Sophora alopecuroides L. under salt and alkali stresses, with a focus on understanding the underlying response mechanisms. The results showed that the germination rate, germination potential, germination index, and vigour index were improved after melatonin solution soaking. Additionally, MT-treated seedlings exhibited enhanced growth under both types of stress, with a notable increase in photosynthetic efficiency, thereby improving the plant’s nutritional status. MT also facilitated osmotic regulation and elevated antioxidant enzyme activity, which effectively mitigated reactive oxygen species (ROS) accumulation. After the cluster correlation analysis, principal component analysis, and the comprehensive analysis of the affiliation function among the indexes, the effect of applying 50 μmol/L MT in salt stress was the most obvious, and it could significantly improve the growth indexes of the seedlings; The best impact of alkali stress was achieved by applying 100 μmol/L MT treatment, which was effective in resisting the toxicity produced by the stress, and we found that alkali stress had a more significant effect on seed germination and seedling growth of Sophora alopecuroides seeds. Exogenous MT was found to promote at low concentrations and inhibit at 250 μmol/L high concentrations in seedlings under both stresses. This study underscores the beneficial effects of exogenous MT in enhancing seed germination, osmoregulation, antioxidant enzyme activity, and photosynthetic pigment levels in Sophora alopecuroides under salt and alkali stresses.