reducing detrimantal effects of salt stress on morphophysiological characteristics of wheat by application of salicylic acid

in order to study effects of exogenous application salicylic acid on morphological and physiological characteristics of wheat (shirazcultivar) under soil and water salinity in the neyriz city, an experiment was conducted in year 2009-2010 by factorial exprement in a completely randomized blocks design with four replications. treatment consisted of three levels of priming with salicylic acid (0‚ 0.5 and 1 mml-1) and spraying with four levels (0‚ 0.25‚ 0.5 and 1 mml-1) at tillering stage. the results showed that salicylic acid used as priming and sprayed improved leaf area‚ chlorophyll a and b‚ yield and yield components. the most efficient treatment was combined treatment of priming and spraying with level of 0.5 and 1 mml-1 concentrations which resulted in 42.9, 9.67 and 21.7% increase in ear number, seed weight and grain yield, respectively in comparison to control treatment. the concentration 1 mml-1 caused a reduction compared to 0.5 mml-1. the results suggest that salicylic acid is effective in reducing symptoms of salinity and in similar soil and water conditions application of 0.5 mml-1 as priming and spraying can be recommened for wheat production.