Genetic divergence study in linseed (Linum usitatissimum L.) through D~2 and principal component analysis

摘要

Genetic diversity among thirty one linseed genotypes was studied using D~2 analysis and principal component analysis (PCA) to efficiently utilize the breeding potential of linseed genotype for improving the yield. On the basis of D~2 analysis, these genotypes were grouped into six divergent clusters in which cluster I was largest with 12 genotypes followed by cluster II and cluster V. The results showed the highest contribution of linolenic acid towards genetic diversity. However, inter cluster D2 value was found to be highest between cluster II and VI followed by V and VI. On the basis of cluster mean, the genotypes of cluster IV were characterized by the highest cluster mean for seed yield per plant and cluster II for oil content and linolenic acid. Principal component analysis distributed all the variables into six principal components accounting for 88.17 per cent of the total variation suggesting the presence of considerable genetic diversity among the genotypes for different characters. Hence, the information obtained can be utilized in selecting diverse parents to get better segregants in linseed breeding programmes.