evaluation of tolerance to water stress in some sesame genotypes

to study genetic diversity and drought tolerance in sesame genotypes, an experiment in a randomized complete block design with three replications in 2010-2011 was conducted at the agricultural research field, university of birjand under stress and non-stress conditions. the aim of this study was the testing of yield, tolerance index and bi-plot analysis. materials included genotypes birjand, khusf, torbate-jam, safi-abad, darab 1, darab 14, bandar abbas, yellowite, dashtestan 2, dashtestan 5, line 2 and line tn234. the irrigation was carried in 100 and 200 mm evaporation of a class pan in normal and stress conditions respectively. the compound analysis of variance showed that the genotypes were different in the most traits except for capsule length, capsule width and the number of capsules. the drought stress was affected on the most traits except for capsule length, capsule width. mean comparisons showed that the genotypes bandar abbas and darab 1 have the highest and safiabad and darab 14 lines have the lowest yp. the genotypes darab 1 and line tn234 have highest and the genotypes birjand and darab 14 have the lowest ys. the maximum damage of drought stress was on the capsule number, economic yield, leaf number and harvest index and the minimum damage were on the auxiliary branch number, seed weight, capsule weight, plant height and biomass. correlation analysis showed that sti, gmp, mp and harm are appropriate and selection on their identified darab1 and tn234 line as desirable genotypes.