PJB-2022-298
COMPARATIVE ASSESSMENT OF GENETIC DIVERSITY IN RAPESEED (BRASSICA NAPUS L.) AND MUSTARD (BRASSICA JUNCEA L.) BASED ON PHENOTYPIC CHARACTERS
Saleem Raza Leghari
Abstract
Rapeseed and Mustard crops are being widely promoted as a matter of crop diversification and potential of a crop to favorably respond to breeding programs depends on its existing nature and magnitude of genetic variability. Therefore, current research was conducted to estimate the genetic diversity in 40 genotypes including 20 Brassica napus and 20 Brassica junacea based on phenotypic characters. The material was grown in randomized complete block design with three replications during the winter season 2020-21. The mean square from analysis of variance demonstrated significant differences for all the parameters among examined varieties. It’s articulated that utilized material comprised sufficient variability. Regarding average performance, two mustard genotypes Dhoom-I and Anmol Raya performed better for seed yield plant-1 and can be evaluated in upcoming breeding programs for enhancing seed yield. Whereas high heritability was recorded in oil content, silique length, 1000 seed index weight and plant height. In diversity analysis, cluster mean, and total divergence contribution revealed maximum difference for various traits and possess worthy source for future breeding program. Magnitude of cluster distance indicated that cluster VI comprised two mustard genotypes Early Raya and Sindh Raya and cluster IV consisted three rapeseed genotypes Rohi sarsoon, hyola-401 and Kn-277 demonstrating that maximum distance is more diverse and helpful for upcoming heterotic recombination. Contrasting genetic variation between rapeseed and mustard genotypes it was noted that rapeseed genotypes exposed more genetic variability in first three components of PCA than its counterpart, this expresses that mustard genotypes also have enormous valuable genetic resources. Similarly genotypes Rohi sarsoon, hyola-401 and Kn-277 resulted highest genotypic scores in 3 dimensional graphs hence these genotypes are more diverse and can be useful for future hybridization program. Key words: Rapeseed, Mustard Genetic diversity, Principal component analysis, Genetic variation
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