Drought resistance of different bread wheat genotypes under irrigated and non-irrigated conditions

This experiment was conducted in order to study and evaluation of drought resistance indices of bread wheat genotypes in irrigated and non-irrigated conditions in Sarableh and Mehran regions of Ilam Province in 00-00. Morphophysiological traits of wheat genotypes were measured depending on the type of each trait under two non–stressed, irrigated, and drought stress, non-irrigated, conditions in a randomized complete block design with three replications. The results indicated that the plant height, 000 kernel weight, seed yield and harvest index were decreased by drought stress. Under drought stress condition, the spike numbers per m and 000 kernel weight had a high positive correlation with seed yield. In irrigated condition, high positive correlation was observed between the seed yield and both the spike numbers per m and harvest index. Results of calculating drought resistance indices in stress and non–stress conditions indicated that MP, STI, and GMP indices had the highest correlation with seed yield and can be used for selecting drought resistant varieties. Acconding to drought resistance indices and cluster analysis, Mohammadi was known as the most resistant variety to drought stress. In total, Mohammadi, Gahar, Koohdasht and Ghanari varieties were the most resistant varieties and produced the highest yield.