Genetic diversity and morpho-agronomic characterization of Gobhi sarson (Brassica napus L) genotypes

Abstract

The present study was carried out to assess the genetic diversity and to characterize the set of fifty Gobhi Sarson
(Brassica napus L) lines during Rabi 2019-2020. Extent of diversity was estimated and distinctness among the cultivated
varieties was established. Divergence analysis categorised the genotypes in to 8 clusters using Mahalanobis D2 analysis.
Cluster II contained the maximum no. of genotypes i.e. 18 genotypes followed by Cluster III (11 genotypes), Cluster I (9
genotypes), Cluster IV (6 genotype), Cluster V (2 genotype), Cluster VI (2 genotype), Cluster VII (1 genotype) and
Cluster VIII (1 genotype). It was observed that seed yield contributed maximum (25.2%) towards divergence, followed by
main raceme length (21.9%), no. of seeds silique-1 (18.3%), no. of pods plant-1 (13.4%), 1000 seed weight (8.5%), oil
content (5.5%), days to 50 per cent flowering (4.2%) and days to 80 per cent maturity (2.9%). Since the inter cluster
distance between Cluster I and V (154.9), followed by Cluster V and VIII (145.1), was found quite large. Also, all the
genotypes were characterized for 24 morphological traits as per DUS Descriptor of PPV&FRA, 2001. A good spectrum of
variation was found in the frequency distribution of genotypes for various characters.