The present studies were undertaken to compare the magnitude of change induced through gamma rays and fast neutrons in two contemporary wheat cultivars (Pak-70 and Indus-5). Eight characters of agronomic importance were investigated. Significant (P=0.05) increase in number of tillers and highly significant (P=0.01) increase in number of grains per spike were observed in the M2 population of Pak-70 derived from treatment of gamma rays. In the M2 population of Indus-5 derived from treatment of fast neutrons, significant decrease (P=0.05) in number of tillers, number of grains per spike and spike fertility was found. The values for variance, genetic variance and heritabilities (broad sense) were higher in M2 population of both cultivars. Such inherited variations for quantitative characters offer unique opportunities of evaluation of new wheat varieties for diverse agricultural environments.