This experiment was conducted to investigate the genetic variability in the quantitative characters and performance of selected mutant plants bearing early maturing and short stature after gamma rays irradiation in M2 generation of non-basmati aromatic rice Badshah Bhog.  The genotypic and phenotypic coefficients (GCV and PCV) of variation vary from 2.97% and 4.83% at 350 Gyh-1 respectively in plant height to 81.50% and 92.42% at 400 Gyh-1 respectively in panicle exsertion. The estimates of heritability (h2) in broad sense were very high (>75%) for secondary branch, plant height panicle exsertion, total tiller, productive tiller, panicle length, primary branch, secondary branch, total grain, spikelet fertility and yield per panicle at all four doses of gamma rays in M2 generation. The estimation of genetic advance (GA) as percent of mean were high (>50%) for total grain, filled grain at all four doses and spikelet fertility at in M2 generation. The maturity duration of dwarf plant and the plant height of the selected population reduced upto 15 to 20 days and 50 to 60 cm respectively as compared to control.  

Key Words: Induced mutation, Gamma ray, M2 generation, polygenic variability