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

Rahul Singh Chauhan; Mukesh Kumar; Shubham Kumar; Mayank Tiwari; Utkarsh Tiwari

doi:10.23910/1.2023.4902

Authors

Rahul Singh Chauhan Dept. of Genetics and Plant Breeding, College of Agriculture, Sardar Vallabhbhai Patel University of Agriculture and Technology, Meerut, Uttar Pradesh (250 110), India https://orcid.org/0009-0001-6979-9143
Mukesh Kumar Dept. of Genetics and Plant Breeding, College of Agriculture, Sardar Vallabhbhai Patel University of Agriculture and Technology, Meerut, Uttar Pradesh (250 110), India
Shubham Kumar Dept. of Genetics and Plant Breeding, College of Agriculture, Sardar Vallabhbhai Patel University of Agriculture and Technology, Meerut, Uttar Pradesh (250 110), India
Mayank Tiwari Dept. of Genetics and Plant Breeding, College of Agriculture, Sardar Vallabhbhai Patel University of Agriculture and Technology, Meerut, Uttar Pradesh (250 110), India
Utkarsh Tiwari Dept. of Genetics and Plant Breeding, College of Agriculture, Chandra Shekhar Azad University of Agriculture and Technology, Kanpur, Uttar Pradesh (208 002), India

DOI:

https://doi.org/10.23910/1.2023.4902

Keywords:

Cluster, d2 statistics, genetic divergence, Indian mustard, RCBD

Abstract

A study was undertaken during the rabi season (October, 2021 to March, 2022) at the crop research center Sardar Vallabhbhai Patel University of Agriculture and Technology Meerut, Uttar Pradesh, India to find out the genetic divergence in 40 genotypes of Indian mustard using the D² statistical approach. Forty (40) diverse genotypes of Indian mustard were examined for genetic divergence using a randomized complete block design (RCBD) with three replications. Observations were recorded on various 14 characters viz; days to 50% flowering, days to maturity, plant height (cm), number of primary branches plant^-1, number of secondary branches plant^-1, siliquae on main axis, length of main axis (cm), siliqua length (cm), number of seeds siliqua^-1, 1000 seed weight (g), biological yield plant^-1 (g), harvest index (%), oil content (%) and seed yield plant^-1 (g). Mahalanobis D² statistics were applied to the analysis of genetic divergence. Based on D² values 40 genotypes were grouped into 5 clusters, maximum genotypes eleven obtained in cluster IV after that cluster I with nine genotypes, cluster V with eight genotypes, cluster III with seven genotypes and cluster II with five genotypes. The maximum intra-cluster was in cluster IV. The maximum inter-cluster distance was revealed between cluster II and V. It is clearly indicated that the genotypes included in this cluster are having a wide spectrum of genetic diversity. According to the role of many traits under examination in the manifestation of genetic divergence, plant height had the biggest contribution to divergence.