GENETIC VARIATION IN F7 GENERATION OF Brassica napus L.

Abstract

A field experiment was conducted with 50 F7genotypes of Brassica napus L. at the experimental field of Sher-e-Bangla Agricultural University, Dhaka to study the correlation, path coefficient and genetic diversity in F7 generation during November 2015 to March 2016. The genotypes were found significantly different for all the characters studied. Comparatively phenotypic variances were higher than the genotypic variances for all the characters studied. The high GCV value was observed for number of secondary branches per plant (39.05) per plant. Days to 50% flowering, days to 80% maturity and thousand seed weight, primary branches per plant and seed yield per plant showed broad base heritability. The significant positive correlation with seed yield per plant was found in plant height (0.950**), the number primary branches per plant (0.977**), number of secondary branches per plant (0.665**), number of siliqua per plant (0.950**), No. of seeds per siliqua (0.947**) and thousand seed weight (0.974**).Path co-efficient analysis revealed that days to 50% flowering, days to 80% maturity, number of secondary branch, siliqua length and thousand seed weight had the negative direct effect on yield per plant whereas plant height and siliqua per plant had the positive direct effect on yield per plant. The genotypes were grouped into six clusters. The highest inter cluster distance (113.901) was observed between cluster I and IV and the maximum intra cluster distance (7.44) was found in cluster II. Considering group distance and other agronomic performance genotypes G7, G37 and G50 might be suggested for future hybridization program.