Role of Plant Antioxidants (Ascorbic Acid, Glutathione, α -Tocopherol, Spermine) in Alleviating Salinity Stress on Growth and Yield of Wheat Plants

A POT experiment was carried out to investigate the role of some plant antioxidants such as ascorbic acid, glutathione, a- tocopherol, spermine in alleviating the harmful effects caused by high salinity level (6g/l) in wheat plants. The seeds were pre-soaked and the plants sprayed with anyone of the antioxidants used. It was concluded that salinity stress depressed all growth parameters and yield components. The data also showed that the different antioxidants could partially alleviate the harmful effect of salinity stress on growth and yield of wheat plants.The data showed that 6000 mg/l salinity level alone or in combination with any of antioxidants used increased the activity of total peroxidase, ascorbic peroxidase, superoxide dismutase and catalase in wheat leaves. In addition, salinity (6000 mg/l) alone or in combination with any of applied antioxidants increased the endogenous contents of ascorbic and glutathione and total phenols but decreased carotenoids