Abstract
A field experiment was conducted at Kulumsa Agricultural Research Center in order to estimate the extent of genetic variation in Ethiopian mustard (Brassica carinata A. Braun). In this study, genetic diversity in 60 Ethiopian mustard genotypes, collected from 16 regions of Ethiopia, were assessed using the techniques of cluster and principal component analyses based on 16 traits. All traits were significantly (P and 19% of the variations, respectively. Days to flowering, days to maturity, seed yield/plot, oil yield/plot and biomass/plot were the most important traits contributing to the total variation of the first principal component, implying the existence of great potential to improve these traits through selection. Keywords: Brassica carinata; Cluster Analysis; Ethiopian Mustard; Genetic Diversity
Highlights
Brassica carinata is an amphidiploid species (BBCC, n = 17) containing the BB genome of B. nigra (n = 8) and CC genome of B. oleracea (n = 9) (Hemingway, 1995; GomezCampo and Prakash, 1999)
The field experiment was conducted at Kulumsa Agricultural Research Center (8° 01' N latitude and 39° 09' E longitude) in Arsi zone, southeastern Ethiopia, in the 2005/2006 cropping season using 60 Ethiopian mustard genotypes collected from 16 different parts of the country (Table 1)
In characterizing genotypes of B. carinata collected from different parts of Ethiopia, Abebe et al (1992) observed the presence of wide variation for morphological and agronomic traits
Summary
Analysis of genetic relationships in crop species is an important component of crop improvement. It helps to analyze genetic variability of cultivars (Singh, 1983), select parental materials for hybridization for making new gene recombinations, select inbred parents or testers for maximizing heterotic response and identify materials that should be maintained to preserve maximum genetic diversity in germplasm sources (Thormann and Osborn, 1992). The D2 values represent the index of genetic divergence among the genotypes both at intracluster and inter-cluster levels. There are a large number of collections, thorough studies have not been carried out on genetic diversity in Ethiopian mustard genotypes. An attempt is made in the present study to assess genetic divergence in Ethiopian mustard genotypes
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