Abstract
Phytomelatonin, a recently discovered unique novel plant growth regulator is widespread among plants with a broad range of phenotypic manifestations and plays several physio-morphological functions in plants. Though melatonin is derived from both animals and plants, it is manufactured inside the cell, especially in chloroplast and mitochondria from tryptophan amino acid. It is a versatile signaling molecule that potentially triggers a sequence of events required to reduce stress conditions in plants. It is an evolutionary conserved pleiotropic bioprotectant that promotes stress tolerance in plants by directly scavenging reactive oxygen species (ROS) or reactive nitrogen species (RNS) due to various physiochemical (heat, cold, water deficit, waterlogging, heavy metal, and several others) and biological (viral, bacterial, and fungal-mediated) environmental stresses. Along with this, phytomelatonin stimulates the free radical-antioxidant defense system, promotes the plant photosynthesis efficiency, enhances stomatal conductance, regulates genes related to stress resistance, and helps in protecting the plant from pathogenic infections by triggering the release of some stress-induced hormones such as jasmonic acid (JA), ethylene, salicylic acid (SA), etc. It induces transcription of genes associated with various physio-morphological processes including rooting, seedling germination, fruit ripening, senescence, and circadian rhythm. In this chapter, we have summarized the protective mechanism of phytomelatonin against diverse abiotic and biotic stress along with its uses for enhancing plant stress resistance.
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Author (Sandeep Kumar and Sachin Kumar) wish to acknowledge the academic support from UCOST, Dehradun (India).
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Kumar, S. et al. (2023). Role of Phytomelatonin in Plant Tolerance Under Environmental Stress. In: Singh, D., Mishra, A.K., Srivastava, A.K. (eds) Stress-responsive Factors and Molecular Farming in Medicinal Plants . Springer, Singapore. https://doi.org/10.1007/978-981-99-4480-4_16
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