Melatonin: A Ubiquitous Pleiotropic Molecule equips researchers with an understanding of the molecular biology of melatonin in plants. The book explores the occurrence of melatonin in several plant species, covering key aspects, including its biosynthesis, physiological function in plant growth and development, and signaling pathways. It then discusses the benefits melatonin has for plant and agricultural development, as well as how it can be utilized as a therapeutic in the treatment of human diseases. The role it can play in the oxidative stress response and circadian rhythm modulation are covered, as well as its nutraceutical potential for human health. The book also covers the importance of melatonin in a range of fields, including drug discovery and disease resistance, agriculture, botany, and biotechnology, and is an ideal reference for researchers across these disciplines. Examines melatonin’s pivotal role as a signaling molecule, elucidating its involvement in a diverse array of biological responses within plants Covers essential aspects like melatonin biosynthesis, regulation, antioxidant properties, and its involvement in stress management in plants Provides an interdisciplinary study of melatonin and its potential uses, including disease management, crop improvement, and nutraceutical development Addresses melatonin’s multifaceted role in regulating key physiological processes in the human body, including circadian rhythms, sleep–wake cycles, and neurological protection Delves into melatonin’s dual role as an immunomodulator influencing immune cells and a powerful antioxidant combating free radicals and alleviating oxidative stress Explores melatonin’s therapeutic and anticancer potential, emphasizing its importance in cardiovascular health, neurology, and cancer research, attributed to its antioxidant and anti-inflammatory characteristics