Genetic variability of rice genotypes under screening of normal and flash flood condition

The present study was undertaken to expose the flash flood tolerance of rice germplasm for some important quantitative traits with genetic variability existing in the 30 rice genotypes. The coefficients of variation at phenotypic and genotypic levels were marginally high for number of grains per panicle, grain yield per plant, grain breadth, 100-grain weight and number of productive tillers per plant and moderate for the traits viz., days to 50% flowering, plant height, panicle length and grain length for both normal and flash flood condition. From the results, high heritability coupled with high genetic advance of per cent of mean was observed for grain yield per plant, panicle length, number of productive tillers per plant, number of grains per panicle and 100-grain weight in both normal and flash flood condition, which indicated the predominance of additive gene action, in controlling these traits, early and simple selection could be exercised due to fixable additive gene effects.