Results in Table (2) showed that spikelet fertility and number of filled grains/panicle decreased as gamma-ray doses increased from 15 to 20 and/or 25Kr. While, the control plants revealed significantly higher mean values for this trait; 95.5 and 121.7, respectively. Previous studies showed that spikelet fertility decreased with an increasing in gamma-ray doses from 10 to 20, 30, 40, and/or 50 Kr (Shadakshari et al., 2001).
Significant differences among the mutagenic treatments were detected for number of panicles/plant. Using a low dose of radiation (15Kr) significantly exhibited higher mean value (15.9) over all treatments but, the differences between 15 and 20 Kr were not significant. This may be ensuring that low doses of radiation in some cases stimulated the growth of M1 plants