Ch 1. Evolution of melatonin as an oxidative stress mitigator in plant -- Ch 2. Melatonin-mediated drought stress mitigation by modulation of physiological and biochemical responses in plants -- Ch 3. Reprogramming of salt stress under the influence of melatonin -- Ch 4. Mechanistic insights on melatonin-mediated heat stress regulation in plant -- Ch 5. Melatonin a key regulator of cold stress in plants -- Ch 6. Illustrating recent development in melatonin-heavy metal research in plant -- Ch 7. Melatonin in Nutrient use efficiency of regulation in crop plants -- Ch 8. Melatonin-mediated signalling and regulation of viral and bacterial diseases -- Ch 9. Explicating the role of melatonin in the mitigation of fungal diseases in plants -- Ch 10. Role of melatonin in management of stress tolerance of forest tree species -- Ch 11. Emerging role of melatonin in integrated management of crop pathogens -- Ch 12. Exploring Melatonin's Potential as an Alternative Strategy for Protecting Plants from Biotic Stresses.