Effects of amino acid arginine on some oxidative parameters and increase of salinity tolerance in wheat plant

In this research, the effect of pretreatment of seeds with arginine (amino acid precursor of nitric oxide and polyamine) on growth parameter, Kﳖ ratio and reduction of oxidative damages induced by salinity (300 mM) were investigated in wheat plant.. Results showed that salinity stress had no significant effect on growth parameters while increased the total oxidative stress index such as lipid peroxidation hydrogen peroxide content and antioxidant enzymes activity. Saking of seeds in arginine (0.5 mM) for 24 hours, reduced the lipid peroxidation and hydrogen peroxide in plants which were under stress. In plants which were under salt stress, pretreatment of seeds with arginine also increased the activity of root and shoot GPX and shoot APX enzymes when compared with non pretreated plants. In this research the K /Na ratio decreased under salt stress and arginine pretreatment increased this ration in plants. According to the protective role of some arginine metabolism compouns such as nitric oxide and polyamines that report in previous study,in this research it seems that arginie caused increasing salt tolerance directly or indirectly throuth some compounds such as nitric oxid and polyamines production