Journal of Crop Breeding

     Due to evaluation Yield and Its components and determining the most important treats affecting on the Yield, 12 different accessions of sesame were cultivated under both normal irrigation and drought stress by randomized complete block design with three replications at Research Farm of Birjand in 2012-2013 years. The parameters measured included the number of capsules, plant height, number of branches, number of leaves, length and width of capsules, 20 capsules weight, grain weight, the weight of 1000 seeds, biological yield and economic yield. Plant height, 1000 seed weight and biological yield showed significant differences in both irrigated conditions. Darab14regard to important agronomic traitsin both conditions had a suitable situation. The correlation results showed that under normal irrigation, the number of leaves per plant (0.616**), 1000 seed weight (0.688*) and weight of 20 capsules (0.579*) had the highest correlation with grain yield. The regression result showed that Biological yield, Number of leaves and weight of 1000 seed had highest coefficients at justifying the yield, respectively. Factor analysis revealed that four factors more than 83 and 71% of total variations in all data are justified in normal and stress conditions. A cluster analysis of accessions, divided them into two and three groups in normal and stress irrigation respectively.