evaluation of terminal drought tolerance in durum wheat genotypes by using of drought tolerance indices

in order to investigation of response of durum wheat genotypes to terminal drought stress, this experiment was conducted in neishabour agricultural research station during two growing seasons of 2004-2005 and 2005-2006. seventeen advanced durum wheat genotypes, two bread wheat cultivars and one durum wheat cultivar (i.e. 20 genotypes and cultivars) were evaluated in two separate experiments (normal and limited irrigation) based on a randomized complete block design with four replications. combined anova of grain yield data revealed that there were significant differences among genotypes for grain yield of durum wheat (p<0.01). on the base of results, between years as well as irrigation schedule were significant, while no significant interaction were detected. among durum wheat genotypes, line no. 15 ,14 and 4 has higher terminal drought tolerance comparison with the others. because of higher correlation between sti and mp with grain yield (under stress and nonstress condition), it seems that they can be used for screening of drought tolerant wheat genotypes. also, on the base of tol and ssi indices, line no. 7 and12 was the most sensitive genotypes in aspect of drought.