VARIABILITY STUDY IN F2 PROGENIES OF THE INTER-VARIETAL CROSSES OF Brassica rapa

Abstract

An experiment was carried out by using the F, population of 12 inter-varietal crosses. including reciprocals, of the species Brassica rapa for estimating the magnitude of variations in characters. heritability and genetic advance. There were significant variations among different F, materials used in the experiment. Genetic parameters viz. number of primary branches/plant, number of secondary branches/plant. length of siliqua, number of seeds/siliqua. days to 50% flowering, 1000 seed weight and yield/plant showed least difference between genotypic and phenotypic variance. Plant height, length of siliqua, number of seeds/siliqua and days to 50% tlowering showed low genotypic and phenotypic co-efficient of variation. Number of primary branches/plant and secondary branches/plant showed high heritability coupled with high genetic advance and very high genetic advance in percentage of mean. However, the yield/plant, days to maturity and length of siliqua showed low heritability. Based on the variability study, some promising F, plants showing high heritability for yield contributing characters were selected from some of the cross combinations of the inter-varietal crosses of Brassica rapa for advancing the generations.