Effect of Different Concentration of Melatonin in Mustard Green (Brassica juncea(L.) Czern) under Salt Stress

Salt stress is one of the non-biological stresses that reduce crop productivity. Salt stress suppresses various physiological reactions in plant. Salt stress also inhibits photosynthesis. In the long term, the growth of plants is restricted by ionic toxicity. Melatonin is a hormone that is biosynthesis in the pineal glands of animals. In 1995, the presence of melatonin was proved in plants. Melatonin promotes plant growth. Moreover, melatonin not only decreases biotic stress but also reduces abiotic stress. Melatonin increase photosynthesis rate and Antioxidative activities to relieve abiotic stress. Accordingly, this study was performed to examine growth changes and physiological reactions when melatonin was treated in salt-damaged plants by concentration.