GENETIC VARIABILITY IN F3 POPULATION OF RICE (Oryza sativa L.)

Abstract

An attempt was made to study variability, genetic parameter, correlation and path coefficient analysis in 21 rice genotypes in Sher-c-Bangla Agricultural University during November 2012 to April 2013. Significant variations were obtained among the genotypes for all the character studied . Considering genetic parameters high genotypic coefficient of variation (GCV) was observed for 1000 grain weight followed by number of filled grain/particle, grain yield/sqm and number of spikeletlpanicle, whereas days to flowering showed very low GCV. High heritability with high genetic advance in percent mean (GAPM) was observed for number of filled grain/panicle followed by grain yield/sqm, number of spikeletlpanicle indicated that these characters were under additive gene control and selection for genetic improvement for these traits might be effective. Days to maturity showed high heritability but low OA(%),which indicated that non additive gene effects were involved for phenotypic expression of this character and selection for such trait may not be rewarding. Correlation coefficient between grain yield/sqm with 1000 grain weight, panicle weight(gm),number of spikelet/panicle, number of filled grain, number of primary branches/particle were positive and highly significant. Among inter character association primary branch vs. number of filled grain vs.1000 grain weight, number of spikeletlpanicle vs. 1000 grain weight, panicle weight vs. 1000 grain weight showed highly significant positive correlation. Path coefficient analysis at genotypic level revealed that maximum direct contribution towards grain yield was obtained through 1000 grain weight indicated that this trait should be considered as primary components of yield. Number of filled grain showed considerable positive indirect effect on 1000 grain weight. The residual effect was 0.1076.