VARIABILITY, CORRELATION AND PATH ANALYSIS IN F3 MATERIALS OF Brassica rapa

Abstract

A research was conducted by using live parental genotypes of l3ra.tcica rupa and their ten F3 progenies including reciprocals in the experimental thmi of Sher-e-Bangla Agricultural University. Dhaka. during November 2006-March 2007 to study the variation in different characters. correlation between pairs of characters and the direct and indirect effect of different characters on seed yield per plant of the F3 matenals. From the values of mean. range and cv (%) of seed yield and yield contributing characters it was conlirmed that there were large variation present among the all genotypes used in the experiment. The values of phenotvpic variances was higher than the corresponding genotypic variances. Number of primary branches per plant, number of secondary branches per plant. days to 50% Ilowcnng. length of siliqua. number of seeds per siliqua. thousand seed weight and yield per plant showed least dit'Ibrence between phcnotvpic and genotypic variances. The values of GC'V and PCV indicated that there were considerable variation among the all characters except days to maturity. ftc plant height, days to 50% flowering and number of siliquae per plant showed high heritability with high genetic advance and genetic advance in percentage of mean. Fifteen most promising plants with yellow seed and short a duration from six crosses and lilly plants with brown seed and a short duration from eight crosses were selected out of the ten crosses of- the F materials of Ilrwsica rapa. Yield per plant had signilicant and highest positive correlation with thousand seed weight and yield per plant showed also positive correlation with days to maturity lollowed by number of seeds per siliquac, number of secondary branches per plant. length of siliqua and number of siliquae per plant. The path co-efficient analysis exhibited that thousand seed weight had the highest positive direct effect followed by days to 50% flowering, length of siliqua. number of primary branches per plant. number of secondary branches per plant. days to maturity and number of seeds per siliqua.