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 among the three doses of gamma-rays were not significant. In spite of, the mutagenic treatments recorded significantly higher number of primary branches/panicle and lower estimates of panicle length than the control plants, the range of variability for the mutagenic plants was mostly similar to that of the control. Previous results showed that variations and the mean values in most of the studied characters was increased by mutagenic treatments but, it decreased significantly for days to heading (Gupta and Sharma, 1994).There was a gradual decrease for all growth indicators plant height, days to heading and panicle length with the increase of radiation dose (Labrada et al., 2001)