"Evaluation of The Performance of Genotypes of Bread Wheat ( Triticum Aestivum L.) for Drought Tolerance Using Drought Indexes and Analysis of Multiple Variables "

"ltural Research Ministry of Agriculture several drought indexes have been used to determine the best genotypes of (Triticum eastivum L.) for drought tolerance in the central region of Iraq, Determination of the efficacy of drought indexes for knowledge the genotypes of drought-tolerant and susceptibility and interpretation of the relationship between drought index used by primary component analysis, cluster analysis and rank sum. experiment was conducted to investigate water stress effect for the some traits of selected genotypes, using split plot arrangement within RCBD with 3 replications. The main plots included 2 levels of water stress (20% and 80%) depletion of available water while, the 9th selected genotypes and the control variety IPA99 occupied sub plots. The use of the best index of drought tolerance, MP, GMP and STI, led to the diagnosis of tolerant and stress-sensitive genotypes due to their association with grain yield in both stress and irrigation (YS and YP), The results of drought tolerance index showed that genotypes 186, 179 and 45 were the most tolerant of drought, while genotypes IPA 99, 117, 27 and 17 were the most sensitive to water stress and the other genotypes 44, 129, 147, middle tolerance or water stress sensitivity, Therefore, we recommend the cultivation of genotypes 186, 179 and 45 in the central region as they are most resistant to drought"