Scholarlink

<p>Heat stress severely inhibits the growth and development of plants. Melatonin could enhance plant tolerance to various abiotic stresses. However, its role in improving heat tolerance of <i>Alisma plantago-aquatica</i> seedlings and the underlying mechanisms remained unclear. Therefore, we investigated the role of exogenous melatonin for enhancing the heat tolerance of <i>Alisma</i> seedlings. Our results showed that heat stress induced osmotic imbalance, triggered oxidative damage, and markedly inhibited photosynthesis, ultimately impairing the growth of <i>Alisma</i> seedlings. The application of melatonin alleviated these heat-induced injuries. Specifically, melatonin increased the contents of non-enzymatic antioxidants and the activities of antioxidant enzymes, consequently mitigating oxidative damage. Melatonin also improved the key photosynthetic parameters, including chlorophyll contents, Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase (RuBisCO) activity, and maximum photochemical efficiency, thereby protecting photosynthesis. Furthermore, melatonin upregulated the expression of heat shock transcription factor and heat shock protein genes, maintaining protein homeostasis within cells. Collectively, our findings indicated that melatonin enhanced the heat tolerance of <i>Alisma</i> seedlings by activating the antioxidant system, protecting photosynthesis, and inducing the expression of heat stress response (HSR) genes. Accordingly, melatonin shows brilliant promise as a plant growth regulator for mitigating heat stress in field-scale applications.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

A Protective Role for Melatonin: Enhancing Heat Tolerance in Alisma plantago-aquatica Seedlings

  • 期刊论文

  • 发表日期：

    2026年7月21日

查看全文
  • Wen-hui Chen,
  • Jiao Wang,
  • Ke-yu Wang,
  • De-qiang Li,
  • Zi-zhong Tang,
  • Yang-er Chen,
  • Shu Yuan,
  • Lu Zhang,
  • Ming Yuan

摘要

Heat stress severely inhibits the growth and development of plants. Melatonin could enhance plant tolerance to various abiotic stresses. However, its role in improving heat tolerance of Alisma plantago-aquatica seedlings and the underlying mechanisms remained unclear. Therefore, we investigated the role of exogenous melatonin for enhancing the heat tolerance of Alisma seedlings. Our results showed that heat stress induced osmotic imbalance, triggered oxidative damage, and markedly inhibited photosynthesis, ultimately impairing the growth of Alisma seedlings. The application of melatonin alleviated these heat-induced injuries. Specifically, melatonin increased the contents of non-enzymatic antioxidants and the activities of antioxidant enzymes, consequently mitigating oxidative damage. Melatonin also improved the key photosynthetic parameters, including chlorophyll contents, Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase (RuBisCO) activity, and maximum photochemical efficiency, thereby protecting photosynthesis. Furthermore, melatonin upregulated the expression of heat shock transcription factor and heat shock protein genes, maintaining protein homeostasis within cells. Collectively, our findings indicated that melatonin enhanced the heat tolerance of Alisma seedlings by activating the antioxidant system, protecting photosynthesis, and inducing the expression of heat stress response (HSR) genes. Accordingly, melatonin shows brilliant promise as a plant growth regulator for mitigating heat stress in field-scale applications.