Melatonin (MEL) is the potential biostimulator molecule, governing multiple range of growth and developmental processes in plants, particularly under different environmental constrains. Mainly, its role is considered as an antioxidant molecule that copes with oxidative stress through scavenging of reactive oxygen species and modulation of stress related genes. It also enhances the antioxidant enzyme activities and thus helps in regulating the redox hemostasis in plants. Apart from its broad range of antioxidant functions, it is involved in the regulation of various physiological processes such as germination, lateral root growth and senescence in plants. Moreover this multifunctional molecule takes much interest due to its recent identification and characterization of receptorCandidate G-protein-Coupled Receptor 2/Phytomelatonin receptor(CAND2/PMTR1) in Arabidopsis thaliana. In this compiled work, different aspects of melatonin in plants such as melatonin biosynthesis and detection in plants, signaling pathway, modulation of stress related genes and physiological role of melatonin under different environmental stresses have been dissected in detail.

褪黑素 (MEL) 是一种潜在的生物刺激分子，控制着植物的多种生长和发育过程，特别是在不同的环境限制下。主要，其作用被认为是一种抗氧化分子，通过清除活性氧和调节应激相关基因来应对氧化应激。它还增强抗氧化酶的活性，从而有助于调节植物的氧化还原止血。除了其广泛的抗氧化功能外，它还参与调节植物的发芽、侧根生长和衰老等各种生理过程。此外，由于最近在拟南芥中对受体候选G蛋白偶联受体2/植物褪黑素受体(CAND2/PMTR1)的鉴定和表征，这种多功能分子引起了广泛关注。在这篇汇编的工作中，详细剖析了植物中褪黑激素的不同方面，如植物中褪黑激素的生物合成和检测、信号通路、胁迫相关基因的调节以及褪黑激素在不同环境胁迫下的生理作用。