To evaluate the inheritance traits of bread making quality of bread wheat, the F1 seeds of a 5´5 half diallel along with their parents were grown in watered and terminal drought conditions in randomized complete block design with two replications at Islamic Azad University, Ardabil, Iran in 2009. The grain protein content, Zeleny sedimentation volume, loaf volume, grain moisture content, grain hardness, water absorption, SDS-sedimentation volume, wet gluten content, thousand kernel mass and hectoliter mass were measured. The result of combined analysis of variance (in two environments) showed that there are significant differences among genotypes for all of the traits excepts for Zeleny sedimentation volume, grain moisture content and wet gluten content, indicating the presence of enough genetic availability among genotypes and as a result genotype mean square can be further separated to general and specific combining ability mean squares. Furthermore, it was concluded that the conditions of drought stress has significance on the grain protein content, SDS-sedimentation volume, wet gluten content,thousand kernel mass and hectoliter mass. A signification GCA and SCA for some traits also observed additive and non additive gene affects in this traits.
