5-2-17-Chakma et al

RICE (Oryza sativa L.)

S. P. Chakma, H. Huq*, F. Mahmud and F. Khatun
*Corresponding author; Email: muna_sau@yahoo.com

 The experiment was conducted at the experimental field of Sher-e-Bangla Agricultural University, Dhaka during January to June of 2011. The experiment was intended to estimate the nature and magnitude of genetic variability, correlation and path coefficient of 39 rice genotypes collected from Bangladesh Rice Research Institute, Lal Teer Seed Ltd. and Chittagong Hill Tracts. All the characters tested showed significant variations among the genotypes. High genotypic coefficient of variation was observed for grain yield and number of unfilled grains per panicle. High heritability coupled with high genetic advance in percent of mean was observed in grain yield, harvest index, 1000-grains weight, unfilled grains per panicle, secondary branches number and plant height indicating additive gene control on the expression of these characters and that selection based on these characters might be effective. The significant positive correlations were recorded for number of effective tillers per plant, 1000-grains weight and harvest index with grain yield at both genotypic and phenotypic levels indicating that the improvement of these characters would lead to increase in grain yield. The highest positive direct effect on grain yield for harvest index followed by number of filled grains indicated that the direct selection based on these characters would be effective for yield improvement.

 Key words: Rice, Genetic variability, Correlation and Path analysis.

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