VARIABILITY STUDY AMONG THE F2 SEGREGANTS OF THE INTER VARIETAL CROSSES OF Brassica rapa

Abstract

A research was conducted by using 27 F: progenies of Brayyica rapu and four check varieties in the experimental fiwm of Sher-e-Bangla Agricultural University. Ohaka. during November 2008-March 2009 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 F2 materials From the values of mean, range and ('V (%) of seed yield and yield contributing characters it was confirmed that there were large variation present among all the genotypes used in the experiment. The phenotpic variances were higher than the genotypic variances. Minimum genotvpic and phenotypic variances were obsened among the F2 progenies for all the characters studied except fir siliquae per plant. The values of GC\' and pcv indicated that there was considerable variation among all the characters except days to maturity. The high ()CV value was observed for secondary branches per plant. The plant height and number of siliquae per plant showed high heritability with high genetic advance and genetic advance in percentage of mean. 33 most promising plants with short duration and higher yield were selected from 27 crosses of the F2 populations of Brussica rapa. Yield per plant had significant positive association with plant height, number of primary branches per plant, number of secondary branches per plant. number of siliquae per plant and thousand seed weight. Path co-efficient analysis revealed that (lays to 50% maturity, number of primary branches per plant, number of siliquae per plant, siliqua length, seeds per siliqua and 1000 seed weight had the positive direct effect on yield per plant whereas clays to 50% flowering, plant height had the negative direct effect on yield per plant.