INTERCENOTYPIC VARIATION AMONG ADVANCED LINES OF Brassica rapa

Abstract

A field experiment was conducted in the experimental field of Genetics and Plant Breeding field laboratory of Sher-e Bangla Agricultural University, Dhaka. Bangladesh during the period of October 2010 to March 2011 to study the inter genotypic variation among advance lines of Brassica rapa. The experiment was carried out to study variability, heritability, genetic advance and genetic advance in percentage of mean, genetic diversity, character associations and direct and indirect effect of different traits on yield. Seeds are sown in the field in Randomized Complete Block Design (RCBD) with three replications. There was a great deal of significant variation for all the characters among the genotypes. Considering genetic parameters high genotypic co-efficient of variation (CCV) was observed for no. of secondary branch, seed yield per plant and seed yield per hectare whereas low GCV was observed for length of siliqua and thousand seed weight. In all cases, phenotypic variances were higher than the genotypic variance. High heritability with high genetic advance in percent of mean was observed for yield per plant indicating that this trait was under additive gene control and selection for genetic improvement for this trait would be effective. The results obtained, showed that seed yield per hectare had highest significant positive correlation with yield per plant. Seed yield per plant had also significant positive correlation with seed per siliqua at genotypic level. Considering group distance and other agronomic performance the inter genotypic crosses between 016 and 018; GlO and Gl9 016 and G22: G16 and 028 may be suggested for future hybridization program. So, these are found the important characters and could be used on direct selection for yield.