Evaluation of Yield and Yield Component of Spring Barely Genotypes under Late Season Drought Stress

In order to evaluation of gain yield and yield components in spring barely genotypes under normal and drought stress in flowering stage and identifying drought tolerant genotypes, sixteen barely genotypes were investigated in two separately Randomized Complete Block Design with three replications in West Azerbaijan Agricultural and Natural Resources Research Center, Urmia, Iran in agronomic season at 2011-2012 crop season. Result of analysis of variance showed that there are highly significant differences among genotypes in studied traits which reveal high genetic variation among the genotypes that provide a choice possibility based on studied traits. Based on the results of mean compression under normal and drought stress condition and drought tolerance index (STI), Kavir/Badia and Rihane-O5 genotypes were introduced as tolerant genotypes with high grain yield and local west Azerbaijan, Local-Check, Tekab and Marand genotypes were introduced as drought-sensitive genotypes with low yield. According to the results of simple correlations analysis, stepwise regression and path analysis in normal irrigation conditions, biological yield and number of fertile tiller and in drought stress condition biological yield were the most important of effective traits on grain yield. Since, the biological yield had high positive direct effect on grain yield under normal and drought stress condition, it can be one of the most important and stable traits for grain yield improvement in the breeding programs.