Preface -- I. Melatonin as an antioxidant -- Chapter 1. Melatonin and the metabolism of reactive oxygen species (ROS) in higher plants -- II. Melatonin, biosynthesis, plant growth, development and reproduction -- Chapter 2. Melatonin in Plants: Biosynthesis, Occurrence and Role in plants -- Chapter 3. Abiotic stress-induced modulation of melatonin biosynthesis accompanying phytohormonal crosstalk in plants -- Chapter 4. Role of melatonin in embryo, seed development and germination -- Chapter 5. Melatonin metabolism in seeds: physiological and nutritive aspects -- Chapter 6. Melatonin in plant growth and signaling -- Chapter 7. Functions and prospects of melatonin during pre-fertilization reproductive stages in plants -- Chapter 8. Melatonin and fruit ripening physiology: crosstalk with ethylene, nitric oxide, hydrogen peroxide and hydrogen sulfide -- Chapter 9. Melatonin and postharvest biology of fruits and vegetables: augmenting the endogenous molecule by exogenous application -- Chapter 10. Melatonin language in postharvest life of horticultural crops -- III. Melatonin and its signaling in biotic and abiotic stress -- Chapter 11. Melatonin-mediated regulation of biotic stress responses in plants -- Chapter 12. Emerging roles of melatonin in mitigating pathogen stress -- Chapter 13. Eco-physiological and morphological adaptive mechanisms induced by melatonin and hydrogen sulfide under abiotic stresses in plants -- Chapter 14. Melatonin in plants under UV stress conditions -- Chapter 15. Molecular physiology of melatonin induced temperature stress tolerance in plants -- Chapter 16. Melatonin-mediated salt tolerance in plants -- Chapter 17. Role of phytomelatonin in promoting ion homeostasis during salt stress -- Chapter 18. Positive regulatory role of melatonin in conferring drought resistance to plants -- Chapter 19. Potential, mechanism and molecular insight of melatonin in phytoremediation.