the way of carbohydrate content, total protein and antioxidant enzymes changing in effect of salicylic acid during programmed cell death in two wheat cultivars

wheat is one of the most important crops in the world that is constantly faced with the different biotic and abiotic stresses. programmed cell death is one of the methods for coping with different stress which is stimulated by several factors. because salicylic acid is involved in resistance to various stresses, to explore the effects of salicylic acid on programmed cell death, the effects of salicylic acid exogenous treatment examined on the chamran and falat cultivars to evaluation of biochemical aspects of plant defense system to transmit messages during the programmed cell death. so, the experiment was conducted in a completely randomized design with three replications. experimental factors consisted of two chamran and falat cultivars, salicylic acid treatment at concentrations of 0, 2.5, 5 and 10 mm and sampling after 8 and 12 hours treatment. the results of this study showed that catalase and polyphenol oxidase activity decreased with increasing of salicylic acid concentration, however carbohydrate, total protein, peroxidase and superoxide dismutase activity increased. the results indicated, as regards, these metabolites are involved in programmed cell death, salicylic acid exogenous treatment could involve in the regulation of programmed cell death through the involvement of antioxidant enzymes activity and protein levels.