Variability and genetic parameter analysis in aromatic rice.

Abstract

An attempt was made to study variability and genetic parameter analysis in 41 aromatic rice genotypes. Significant variations observed, the phenotypic variance was higher than the corresponding genotypic variance for the characters. These differences were in case of number of panicles per hill, number of primary branches, number of filled grains per panicle, spikelet sterility (%) and grain yield per hill indicating greater influence on environment for expression of these characters.1000-grain weight and days to maturity showed least difference between phenotypic and genotypic variance, which indicated additive gene action for expression of the characters. Considering genetic parameters high genotypic coefficient of variation (GCV) value was observed for 1000-grain weight followed by spikelet sterility (%), grain yield per hill and number of filled grains per panicle, whereas days to maturity showed very low GCV. High heritability with high genetic advance in percent of mean (GAPM) was observed for 1000-grain weight followed by spikelet sterility (%) and number of filled grains per panicle indicated that these characters were under additive gene control and selection for improvement might be effective. Days to maturity showed high heritability but low genetic advance (GA) (%), which indicated that non additive gene effects were involved for phenotypic expression of this character.