Number of primary branches/panicle was significantly higher at the mutagenic treatments than those of the control plants but, the differences among the mutagenic treatments were not significant. However the opposite was true for panicle length, as un-treated plants detected longer panicles than the treated plants (Table 3). Also, the differences Data presented in Table (3) showed that number of spikelets/panicle was significantly affected by mutagenic treatments in M2-generation. The mean value of this trait was increased at the dose of 25 Kr in M2-generation. The range of variability was greater (96.2-159.6) compared with the other two dosage or the control. The coefficient of variation after treatments with gamma-rays was folded several times compared with