In order to evaluate the tolerance of bread wheat genotypes to end-season drought, an experiment was carried out by 14 genotype in the form of randomized complete blocks design with three replications along with two separate tests, one for normal irrigation and other for end- season drought stress conditions in three regional countries including Pars Abad, Bilesavar and Ardabil in 2010-2011 agricultural years. Application of sensitivity and stress tolerance indices such as MP, GMP, TOL, SSI and STI on grain yield showed that among the 14 genotypes, genotype 10 was the most desirable genotype. Also, with respect to a meaningful and positive correlation between biomass weight at anthesis stage and grain weight in spike in both normal irrigation and stressed conditions after the anthesis stage, it is recommended that the use of grain weight in spike at anthesis time in breeding programs should be considered.
