evaluation genetic control of yield, yield components, stem and flag leaf angle in bread wheat (triticum aestivum l.) under drought stress condition

combining ability, gene action, heritability and other genetic parameters in bread wheat under drought stress condition were evaluated using half diallel design. nine wheat cultivars and 36 derived f1 assessed in a randomized complete block design with three replications in shahid bahonar university of kerman research field in 2013. evaluated genotypes showed high diversity for all traits. general combining ability(gca) was highly significant for all traits and specific combining ability(sca) was significant for all traits except stem angel. these results show the additive and non-additive effects on genetic control of these traits. validity test of hayman model showed the effect of epistasis on genetic control of all traits apart from stem angle. this dilemma makes breeding more obscure for these traits. narrow heritability varied from 0.06 for flag leaf angel to 0.49 for stem angel. high baker ratio, absent of epistasis and high narrow heritability show high response to selection in breeding programs for stem angel. selection during segregation generation would be effective for this trait. non-additive effects (dominant and epistasis) were highly important in genetic control of other traits. bulk, single seed descent and double haploid methods are appropriate for these traits in breeding programs.