International Genome Center, Jiangsu University, Zhenjiang, 212013, China.
Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, China.
Redox Biol. 2023 Aug;64:102805. doi: 10.1016/j.redox.2023.102805. Epub 2023 Jun 30.
Plants being sessile in nature, are exposed to unwarranted threats as a result of constantly changing environmental conditions. These adverse factors can have negative impacts on their growth, development, and yield. Hormones are key signaling molecules enabling cells to respond rapidly to different external and internal stimuli. In plants, melatonin (MT) plays a critical role in the integration of various environmental signals and activation of stress-response networks to develop defense mechanisms and plant resilience. Additionally, melatonin can tackle the stress-induced alteration of cellular redox equilibrium by regulating the expression of redox hemostasis-related genes and proteins. The purpose of this article is to compile and summarize the scientific research pertaining to MT's effects on plants' resilience to biotic and abiotic stresses. Here, we have summarized that MT exerts a synergistic effect with other phytohormones, for instance, ethylene, jasmonic acid, and salicylic acid, and activates plant defense-related genes against phytopathogens. Furthermore, MT interacts with secondary messengers like Ca, nitric oxide, and reactive oxygen species to regulate the redox network. This interaction triggers different transcription factors to alleviate stress-related responses in plants. Hence, the critical synergic role of MT with diverse plant hormones and secondary messengers demonstrates phytomelatonin's importance in influencing multiple mechanisms to contribute to plant resilience against harsh environmental factors.
由于不断变化的环境条件，植物作为固着生物，会面临不必要的威胁。这些不利因素会对植物的生长、发育和产量产生负面影响。激素是细胞对不同外部和内部刺激做出快速反应的关键信号分子。在植物中，褪黑素 (MT) 在整合各种环境信号和激活应激反应网络以开发防御机制和植物弹性方面起着关键作用。此外，褪黑素可以通过调节氧化还原稳态相关基因和蛋白质的表达来解决应激引起的细胞氧化还原平衡的改变。本文的目的是编译和总结有关 MT 对植物生物和非生物胁迫抗性影响的科学研究。在这里，我们总结出 MT 与其他植物激素（例如乙烯、茉莉酸和水杨酸）协同作用，并激活植物防御相关基因以对抗植物病原体。此外，MT 与钙、一氧化氮和活性氧等二次信使相互作用，调节氧化还原网络。这种相互作用触发不同的转录因子来减轻植物的应激相关反应。因此，MT 与多种植物激素和二次信使的关键协同作用表明，植物褪黑素在影响多种机制以促进植物对恶劣环境因素的抗性方面具有重要作用。
