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Response of two bread wheat cultivars to application of salicylic acid under variable moisture regimes


 Start Page 1171 | End Page 1185


Drought stress is one of the phenomena that limited growth and crop Yield around the world, especially in arid and semi-arid regions. To investigate the effect of salicylic acid on Yield and some physiological parameters of wheat under Drought stress, a split plots experiment was conducted in a randomized complete block design with four replications at Agricultural Research Center of Ilam, during 2014-2015 cropping season. Experimental factors included moisture treatments in three levels (control (100), 70 and 40 % field capacity), salicylic acid in three levels (0, 50 and 100 μ M) and two wheat cultivars (Bahar and Pishtaz). The results showed that triple interaction between Drought stress, salicylic acid and cultivars on all traits was significant. By increasing Drought stress photosynthetic pigments, number of grains per spike and thousand seed weight was significantly decreased, while the use of 50 and 100 μ M salicylic acid in this situation improved these traits. Proline content and soluble carbohydrates were ascending with increasing severity of Drought stress, that this trend by use of salicylic acid (50 and 100 μ M) decreased. Although no significant difference between the two cultivars in the grain Yield was observed under Drought stress, but numerically under Drought stress the highest and lowest Yield related to Pishtaz, 70 % field capacity by 100 μ M salicylic acid and Bahar, 40 % field capacity by non salicylic acid treatment, respectively. Generally, it seems that application of salicylic acid (50 μ M) under Drought stress by improving the plants physiological processes, while increasing plant resistance, lead to greater economic performance.


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