Yield stability of Barley Elite Lines under Water Deficit and full irrigation Condition

Yield stability of barley elite lines and Bahman genotype (control) studied by complete block design experiment under full irrigation and water deficit stress conditions in 2013-2015. The results of two year's mean revealed that grain yield under complete irrigation condition for lines 3, 4, 5, 7, 9 (Golgeh cultivar) and 10 between 15 to 37 percent and under stress condition, lines 2, 7 and 9 (Golgeh cultivar) between 15 to 19 percent were higher than Bahman cultivar (Control). Based on MP, HARM, STI and GMP indices, lines 7 and 9 (Golgeh cultivar) were identified as the most tolerant barley elite lines under stress condition. Cluster analysis based on drought tolerance indices placed barley genotypes in three clusters. The generation amount of enzymes GPX, CAT, MDA, H2O2 and SOD increased under stress compared to complete irrigation condition, Superoxide dismutase enzyme (SOD) due to the highest positive and significant correlation with seed yield, was detected as the most effective enzyme in tolerance to drought stress condition. The results of cluster analysis based on antioxidant properties showed that the studied lines were placed in two clusters, which second cluster including lines 1, 2, 7 and 9 (Golgeh cultivar) were presented as tolerant barley elite lines. Finally, regarding to all the indicators studied, lines 7 and 9 (Golgeh) were identified as superior lines compare with Bahman cultivar under normal and water deficit conditions and were identified as most tolerated lines to water deficit condition.