VARIABILITY STUDY IN F2 PROGENIES OF Brassica rapa

Abstract

The experiment was conducted with seven parental genotypes and their twenty one F2 progenies of IJrassica rapa at the experimental farm of Sher-e-Bangla Agricultural University. Dhaka- 1207, during November. 2007 to March. 2008 to study the variability, correlation among different characters and direct and indirect efftct of diflèrent characters on seed yield per plant. The phenotypic variances were higher than the genotpie variances. Least genotypic and phenotypic variance was observed among all the parental genotypes and their F2 progenies for all the characters studied except for siliquae per plant. The high GCV value was observed for secondary branches per plant. The number of secondary branches per plant was also showed high heritability with high genetic advance in percent of mean. Based on the variability and as per our objectives nineteen most promising yellow seeded and thirty six most promising brown seeded plant with short duration were selected from the F2 progenies. Seed yield per plant had significant positive association with number of primary branches per plant, number of secondary branches per plant. number of siliqune per plant. Path co-efficient analysis revealed that days to 50% flowering, number of primary branches per plant, number of secondary branches per plant, number o! siliquae per plant, siliqua length, seeds per siliqua and thousand seed weight had the positive direct efiëct on seed yield per plant. And days to maturity and plant height had the negative direct effect on yield per plant.