[en] this study was carried out in 2002/2003,2003/2004 and 2004/2005 seasons at the fields and laboratories of nuclear research center, inshas, egypt in an attempt to induce drought tolerant mutants in the egyptian bread wheat cultivars sids 1 and sakha 93 via gamma rays and EMS mutagens , variability parameters, heritability and genetic advance from selection in M₂ and M₃ bulks derived via these mutagens were estimated and yield superiority of the new induced mutants over parent cultivars and M₂ bulks were evaluated under water-stress and non-stress conditions. significant differences were observed among M₂ and among M₃ bulks as well as among M₃ families selected under water stress or non-stress for all studied traits. irradiation and EMS mutagens succeeded to induce new variability measured by increases in means, ranges, PCV and GVC parameters in many M₂ and M₃ bulks under stress and non-stress, comparing induced M₂ with M₃ bulks , for superiority in studied genetic parameters including heritability in board sense (h_b²)and expected genetic advance (G A) from selection indicated that there were 3 common superior bulks in both M₂ and M₃ generations (Sd-RAD-1, Sd -RAD-3 and Sd -EMS-1) under non-stress, while under water stress there were two common superior bulks (Sd-EMS-3 and Sk-RAD-2).superiority of these induced bulks qualified them for predicting to achieve genetic improvement in grain yield via selection under drought stress and non-stress conditions