Studies on Genetic Variability and Divergence in Mustard (Brassica Juncea L.).

Abstract

The purpose of the research is to study Genetic Variability, Divergence and correlation studies on 20 genotypes of mustard The phenotypic coefficient of variation was greater than genotypic coefficient of variation for all the traits. The high magnitude of both coefficients was recorded in case of number of primary number, secondary, number of siliquae per plant, seed yield per plant and harvesting index. High heritability with high genetic advance was recorded for number of primary branches, number of secondary branches, length of main raceme, number of siliquae in main raceme, number of siliqua per plant, number of seeds per siliquae, biological yield, 1000 seed weight, seed yield per plant and harvesting index. In the present findings the significant phenotypic correlation of seed yield per plant were found positive for the characters Days to 50% flowering, plant height, number of primary branches, number of secondary branches, length of main raceme, number of siliqua per plant, length of siliqua, number of seeds per siliqua, harvesting index and seed yield per plant showed positive significant correlation with seed yield per plant. The path coefficient analysis of different characters revealed that highest positive direct effect on seed yield per plant per plant was exerted by harvest index per plant followed by biological yield and negative direct effect on seed yield / plant was exhibited by number of siliqua per plant followed by length of siliqua, days to 50% flowering, number of secondary and number of primary branches. Diversity among clusters varied from 11.87 to 33.28.The highest intra-cluster distance was recorded in cluster II The genotypes falling in these clusters could be utilized for hybridization programme in Indian mustard.

Analysis of the Genetic Diversity in Indian Mustard (Brassica juncea L. Czern&Coss) Genotypes

“…Quantification of genetic diversity existing within and between groups of germplasm is important and particularly useful in the proper choice of parents for realizing higher heterosis and obtaining useful recombinants. Numerous studies have already assessed the genetic diversity of B. juncea using phenotypic traits (Bind et al, 2015, Devi et al, 2017, Rout et al, 2018, Kumari et al, 2018, Saikrishna et al, 2021, Reddy et al, 2022, Sur et al, 2023. Several methods have been advocated by various workers to estimate the genetic divergence in crop plants ( Murthy and Arunachalam, 1966).…”