Environmental stress includes adverse factors like water deficit, high salinity, enhanced
temperature and heavy metals etc. These stresses alter the normal growth and metabolic processes of
plants including photosynthesis. Major photosynthetic responses under various stresses include inhibition
of photosystems (I and II), changes in thylakoid complexes, decreased photosynthetic activity and
modifications in structure and functions of chloroplasts etc. Various defense mechanisms are triggered
inside the plants in response to these stresses that are regulated by plant hormones or plant growth
regulators. These phytohormones include abscisic acid, auxins, cytokinins, ethylene, brassinosteroids, jasmonates and
salicylic acid etc. The present review focuses on stress protective effects of plants hormones on the photosynthetic responses.