VARIABILITY AMONC ADVANCED LINES IN Brassica rapa L.

Abstract

A research was conducted by using twenty one (21) F0 populations derived from inter-varietal crosses of lirassica rapa L. and grown in the experimental irm of Sher-c-Bangla Agricultural University. Dhaka. during November 20!!- March 2012 to study the magnitude of variations in characters, heritability, genetic advance, character associations, direct and indirect efkct of different characters on seed yield. There were signilieant variations in number of primary branches per plant. number ot secondary branches per plant, number of silliqua per plant, days to 50% flowering, length of siliqua, number of seeds per siliqua. 1000 4   seed weight and yield per plant showed some differences between genotypic and phenotypie variances. Plant height. length of siliqua. number of silliqua per plant, days to 50% flowering showed low genotypic and phenotypie coefficient of variation. Plant height, number of primary branches per plant. number of secondary branches per plant and number of silliqua per plant showed high heritability coupled with high genetic advance and very high gene tic advance in percentage of mean. however. length of siliqua showed low heritability. Correlation study revealed that yield per plant had significant positive association with plant height, number of primary branches per plant. number of siliqua per plant, seeds per siliqua, and siliqua length (genotypic or phenotypie level). Path co-efficient analysis revealed that plant height. number of" primary branches per plant, number of siliqua per plant. seeds per siliqua, and siliqua length had the positive direct effect on yield per plant and days to 50% flowering, number of secondary branches per plant, and thousand seed weight had the negative direct effect on yield per plant. I3ased on the variability study, some F9 plants showed high heritability Ibr short duration and yield contributing characters were selected from some of the cross combinations of the intervarital crosses of Brassica rape: for further selection.