Some physiological responses of two wheat cultivars to foliar application of salicylic acid under drought stress

To investigate the responses of some physiological parameters of two wheat cultivars to Salicylic acid under variable moisture condition, an Split split plot experiment was conducted in a randomized complete block design with four replications at Agricultural Research Center of Sarableh, Ilam during 2014-2015 cropping season. Experimental factors included Moisture treatments in three levels (control (100), 70 and 40 % Field capacity) In the main plots, Salicylic acid in three levels (0, 50 and 100 µM) in the sub plot and two wheat cultivar (Bahar and Pishtaz) in sub sub plot. Studied traits in this study included yield, Relative Water Content, Stomatal conductance, Rubisco activity, Photosynthetic rate, Transpiration rate, Electrolyte leakage and Sub stomatal CO2 concentration. The results showed that Triple interaction between drought stress, salicylic acid and Cultivars on all traits was significant. Although By increasing drought stress yield and Relative Water Content was significantly decreased, while the use of salicylic acid in this situation improve these traits. Also by increasing drought stress Electrolyte leakage were decreased, but the use of salicylic acid improved that. Photosynthetic rate and Rubisco activity By increasing salicylic acid Decreased In comparison with control. In general, given the role of salicylic acid in reducing the negative impact of stress on some physiological processes that studied in this research, its application in drought conditions is advisable.