Melatonin and Its Crosstalk with Other Plant Hormones Under Stressful Environments

The discovery of melatonin in plants was started in the late 90s, but its functions, signaling, and crosstalk with various phytohormones is still unknown. The research on melatonin in plants has increased spectacularly during recent years and the function of this assumed plant hormone under stress (biotic and abiotic) conditions has also been accounted. In the present chapter, we talk about the key job of melatonin in the morphological and physiological functioning of the plants, its crosstalk with auxin, gibberellic acid, cytokinin, abscisic acid, ethylene, jasmonic acid, and salicylic acid under abiotic stress as well as normal environmental conditions. All these features of melatonin recommend that phyto-melatonin is an important factor in agriculture for crop progress even under stress conditions.