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Molecules 2018, 23(8), 1887;

The Role of Phyto-Melatonin and Related Metabolites in Response to Stress

4,5,* and 1,*
State Key Laboratory for Conservation and Utilization of Bio-resources in Yunnan, Yunnan University, Kunming 650091, China
School of Agriculture, Yunnan University, Kunming 650504, China
Institute of Medicinal Plants, Yunnan Academy of Agricultural Sciences, Kunming 650205, China
Biocontrol Engineering Research Center of Plant Disease & Pest, Yunnan University, Kunming 650504, China
Biocontrol Engineering Research Center of Crop Disease & Pest, Yunnan University, Kunming 650504, China
These authors contributed equally to this work.
Authors to whom correspondence should be addressed.
Academic Editor: Dun-Xian Tan
Received: 28 June 2018 / Revised: 26 July 2018 / Accepted: 26 July 2018 / Published: 28 July 2018
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Plant hormone candidate melatonin has been widely studied in plants under various stress conditions, such as heat, cold, salt, drought, heavy metal, and pathogen attack. Under stress, melatonin usually accumulates sharply by modulating its biosynthesis and metabolic pathways. Beginning from the precursor tryptophan, four consecutive enzymes mediate the biosynthesis of tryptamine or 5-hydroxytryptophan, serotonin, N-acetylserotonin or 5-methoxytryptamine, and melatonin. Then, the compound is catabolized into 2-hydroxymelatonin, cyclic-3-hydroxymelatonin, and N1-acetyl-N2-formyl-5-methoxyknuramine through 2-oxoglutarate-dependent dioxygenase catalysis or reaction with reactive oxygen species. As an ancient and powerful antioxidant, melatonin directly scavenges ROS induced by various stress conditions. Furthermore, it confreres stress tolerance by activating the plant’s antioxidant system, alleviating photosynthesis inhibition, modulating transcription factors that are involved with stress resisting, and chelating and promoting the transport of heavy metals. Melatonin is even proven to defense against pathogen attacks for the plant by activating other stress-relevant hormones, like salicylic acid, ethylene, and jasmonic acid. Intriguingly, other precursors and metabolite molecules involved with melatonin also can increase stress tolerance for plant except for unconfirmed 5-methoxytryptamine, cyclic-3-hydroxymelatonin, and N1-acetyl-N2-formyl-5-methoxyknuramine. Therefore, the precursors and metabolites locating at the whole biosynthesis and catabolism pathway of melatonin could contribute to plant stress resistance, thus providing a new perspective for promoting plant stress tolerance. View Full-Text
Keywords: melatonin; reactive oxygen species; biosynthesis; catabolism; stress resistance melatonin; reactive oxygen species; biosynthesis; catabolism; stress resistance

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Yu, Y.; Lv, Y.; Shi, Y.; Li, T.; Chen, Y.; Zhao, D.; Zhao, Z. The Role of Phyto-Melatonin and Related Metabolites in Response to Stress. Molecules 2018, 23, 1887.

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