GENETIC VARIATION AND CHARACTER ASSOCIATION IN F 9 POPULATION OF Brassica napus L.

Abstract

A field experiment was conducted with 33 F population of Brassica napus L. at the experimental field of Sher-e-Bangla Agricultural University, Dhaka to study the genetic variation and character association of F 9 population during November 2018 to February 2019. The population were found significantly different for all the characters studied. Phenotypic variances were comparatively higher than the genotypic variances for all the characters studied. days to first flowering, days to 50% flowering, number of siliqua per plant, 1000 seed weight (g) and seed yield per plant showed high broad base heritability. The significant positive correlation with seed yield per plant was found in days to first flowering, days to 50% flowering, plant height, number of primary branches per plant, number of secondary branches per plant and number of siliqua per plant. Path co-efficient analysis revealed that days to first flowering, days to 50% flowering, plant height (cm), number of primary branches per plant, number of siliqua per plant, number of seeds per siliqua and 1000 seed weight (g) had the positive direct effect on yield per plant whereas, number of secondary branches per plant and siliqua length had the negative direct effect on yield per plant. In case of genetic diversity analysis the population were grouped into five clusters. The highest inter-cluster distance was observed between clusters II and V and the maximum intra-cluster distance was found in cluster V. Considering group distance and performance population - G 1 (Nap-9908×Nap-9901), G 2 9 (Nap-9906×Nap-9901), G (Nap9905×Nap0130), G 6 (Nap-108×Nap-2066), G 7 (Nap-9908×Nap-0130), G (Nap108×Nap9901),

G 20 (Nap-9901×Nap-2066), G (Nap-108×Nap-0130) and G 32 24 (Nap-9906×Nap-2066) could be considered suitable population for efficient hybridization in future.