VARIABILITY CORRELATION AND PATH ANALYSIS IN SEGREGATING POPULATION OF Brassica rapa OBTAINED THROUGH INTERVARITAL CROSSES

Abstract

A research was conducted by using eight F2& eight F4 populations generated through inter-varietal crosses, along with three check varity of Brassica rapa and grown in the experimental farm of Sher-c-Bangla Agricultural Unriversity. Dhaka, during November 2009-March 20010 to study the variation in different characters, correlation between pairs of different characters and the direct and indirect effect of different characters on seed yield per plant of the F2 & F4 materials to select the plants with higher potential. From the values of mean, range and CV (%) of seed yield and yield contributing characters it was confirmed that there were considerable variation present among all the genotypes used in the experiment. It was shown that more seggregation present in P2 material than F4 material. The values of phenotypic variances were higher than the corresponding genotypic variances. I)ays to 50% flowering, days to maturity, number of primary branches per plant, number of secondary branches per plant, length of siliqua, number of seeds per siliqua. thousand seed weight and yield per plant showed least difference between phenotypic and genotypic variances. The values of GCV and PCV indicated that there was least variation present among most of the characters. The days to maturity, length of siliqua, seeds per siliqua, thousand seed weight showed high heritability with low genetic advance and genetic advance in percentage of mean. Yield per plant had significant and highest positive correlation with length of siliqua, seeds per siliqua and thousand seed weight. The path co-efficient analysis revealed that siliquae per plant had the highest positive direct eRect followed by number of secondary branches per plant, days to 50% flowering, length of siliqua, and plant height. Sixteen most promising plants with short duration and higher yield were selected from eight crosses of the F2 populations of Brassica rapa & forteen most promising plants with short duration and higher yield were selected from eight crosses of the F4 populations