VARIABILITY AND INTERRELATIONSHIPS IN TRAITS OF F4 POPULATIONS OF BORO RICE (Oryza sativaL.)

Abstract

A field experiment was conducted with 27 genotypes (22 F4 materials and 5 check varieties) of Oryza sativa L. at the experimental field of Sher-e-Bangla Agricultural University, Dhaka to select early high yielding Boro materials during November, 2013 to May, 2014. The experiment was laid out in Randomized Complete Block Design with three replications. Variability, heritability, correlation and path coefficient were analyzed on the basis of fourteen characters. The genotypes were found significantly variable for most of the characters. Phenotypic variances were comparatively higher than the genotypic variances for all the characters studied. Also PCV were higher than the GCV for all the characters studied. High heritability with high genetic advance in percent of mean was observed for total number of tiller per plant, total number of effective tiller per plant, number of primary branches per panicle, total number of spikelet per panicle, number of filled spikelet per panicle, yield per plant, thousand grain weight and yield per hectare .The significant positive correlation with yield per hectare was found in days to maturity, panicle length, number of secondary branches per panicle and thousand grain weight. Path coefficient analysis revealed that days to maturity, plant height, number of effective tiller per plant, number of filled spikelet per panicle, total number of spikelet per panicle, yield per plant and thousand gain weight had the positive direct effect on yield per hectare. Considering the variability, heritability, correlation and path coefficient analysis, the seven (7) genotypes viz., (BR 21 × BRRI dhan 29, S-6, P-7), (BR 21 × BRRI dhan 28, S-5, P-4), (BR 21 × BRRI dhan 29, S-6, P-6), (BR 21 × BRRI dhan 29, S-6, P-4), (BR 24 × BRRI dhan 29, S-5, P-4), (BR 21 × BRRI dhan 29, S-6, P-5), (BR 21 × BRRI dhan 29, S-6, P-3) were selected as early high yielding Boro lines for future use.