Study of genetic components of variance for yield attributing characters in exotic germplasm of rice

Analysis of variance indicated that the differences among genotypes were highly significant for all the traits studied indicating that the genotypes were highly diversified. The parameters of genetic variability viz., mean, range, phenotypic and genotypic coefficient of variation (%) for all the seventeen characters. The phenotypic coefficient of variation was higher in magnitude than that of genotypic coefficient of variation for all the characters studied (Buu and Truong, 1988; Zahid et al., 2006). The character viz., number of unfilled grains/panicle recorded the highest phenotypic (65.44%) and genotypic coefficient of variation (61.33%). Plant height and 1000 grain weight showed moderate values whereas panicle length, days to 50% flowering, and spikelet fertility % showed low values of phenotypic and genotypic coefficient of variation. The phenotypic (6.92%) and genotypic coefficient (6.25%) values were smallest for spikelet fertility %.