Exploring genetic diversity in brinjal (Solanum melongena L.) - Insights from D2 analysis and principal component analysis
Keywords:
Brinjal, Principal Component Analysis, D2 analysisAbstract
In the present study, genetic divergence was quantified in thirty brinjal accessions based on 22 morphologicaldescriptors using multivariate techniques. The 30 brinjal genotypes were divided into nine clusters using D2statistic (Tocher’s method). The distance between clusters IV and IX was the highest (214.67), followed byclusters IV and VIII (186.04). The largest distance between genotypes within a cluster was found in ClusterI (65.30), followed by Clusters IV, III, and II. For fruit breadth and single fruit weight, Cluster IV withgenotypes SM-12 and SM-19 had the highest cluster means. Cluster VI with the genotype SM-14 had thehighest cluster mean values for fruit yield per plant and yield per harvest. In Principal Component Analysis(PCA), first four PCs (Principal Components) contributed 59.661% of the total variation and the first sevencomponents were with eigenvalues>1 for the 30 brinjal genotypes. The accessions SM-9, SM-12, SM-19,SM-14 and SM-27 were placed distinctly in the scatter plot of PCA as well as in different clusters with highinter-cluster distance in cluster analysis of Tocher’s method. Based on this, it can be inferred that crossesbetween these genotypes can be used to produce heterotic hybrids in future crop improvement programs.References
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