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Now a day, plants, a source of natural antioxidants are facing various kinds of environmental stress during their growth and development. Under stress, plants have potential to synthesize several secondary metabolites to cope with the adverse effects of stress. In the present review paper, the information on the effects of different abiotic stresses on the levels of secondary metabolites in plants is summarised. The production of secondary metabolites in plants can be enhanced by modifying their environmental conditions.