Ch 1. Melatonin discovery and divergent biosynthetic pathways in plant -- Ch 2. Melatonin detection and quantification techniques -- Ch 3. Melatonin-mediated regulation of germination, plant establishment and vegetative development -- Ch 4. Regulatory role of melatonin in flowering, fruit setting and ripening -- Ch 5. Regulatory role of melatonin in photosynthesis and respiration -- Ch 6. Phytohormonal cross-talk with melatonin in plant -- Ch 7. Interaction of melatonin with reactive oxygen species in plants -- Ch 8. Reactive Nitrogen Species (RNS) and Melatonin Interaction in Plant -- Ch 9. Diverse functional role of melatonin in post-harvest biology -- Ch 10. Regulatory role of melatonin in post-harvest management of vegetables and fruits -- Ch 11. Synergistic effect of melatonin in plant growth and development in stress mitigation -- Ch 12. Melatonin mediated regulation of growth, production and protection in forest plant species -- Ch 13. Melatonin: A promising tool against climate change and food security for better plant survival.