تاثیر روش های متفاوت کاربرد سالیسیلیک اسید بر تحمل به تنش شوری در جو

The effect of different methods of salicylic acid (SA) application on salinity tolerance in barley was examined as a factorial experiment based on completely randomized design at College of Agriculture, Shiraz University during 2013. The treatments included five levels of SA application (no used, seed priming and foliar application at complete establishment, double ridges and anthesis) and three salinity levels (no stress, 6 and 12 dS m-1). The results showed that salt stress decreased thousand grain weight, grain yield, biological yield, harvest index and K+ and increased Na+. These changes were greater at the higher salinity levels. Salt stress at 12 dS m-1 caused 30.1, 25.1 and 8.2% reduction in grain yield, biological yield and harvest index, respectively. Application of SA improved all measured characters. Furthermore, SA could compensate such adverse effects of salinity, i.e SA application increased K+ and decreased Na+ concentration and so enhanced K+/Na+ ratio. The highest positive effect of SA was observed for foliar application at establishment following by priming. The highest grain yield was obtained from SA foliar application at establishment under no stress conditions; while the lowest yield reduction due to salinity was observed in SA seed priming. Overall, the highest positive impact of SA was found in foliar application at establishment.