ABSTRACT
The physiological and biochemical foundation of plant abiotic stress tolerance has long been a key component of research aimed at improving plant productivity in arid and semi-arid farmed lands around the world. Abiotic stress adversely affects plant growth and metabolism and therefore reduces plant productivity and yield. Indolamine is a multi-functional molecule that is ubiquitous in all living organisms and performs essential roles in plant abiotic stress tolerance. It plays an important role in plant processes ranging from seed germination to senescence, besides performing the function of a biostimulant in improving the plant's productivity. The two types of indoleamines, namely serotonin and melatonin, possess antioxidative and growth-inducing properties, thus proving beneficial for stress acclimatization. Indoleamine regulates plant stress responses by directly inhibiting the accumulation of reactive oxygen and nitrogen species, and by indirectly affecting stress response pathways. The current review elaborates on its function under various abiotic stresses.
