Estimation of genetic divergence among indigenous and exotic accessions of tomato (Solanum lycopersicum L.)
MUKUL K. SRIVASTAVA, VISHAL K. AGRAWAL AND R.K. AGRAWAL
Journal Title:Asian Journal of Bio Science
Mahalanobis’s D2 analysis was employed to estimate the distances between and within the clusters formed from the test genotypes. Ten
clusters were formed using Tocher’s method. Cluster I, III and X were having 16, 3 and 2 genotypes, respectively, rest of the seven clusters were
solitary and having single genotype each. The highest inter-cluster distance was found between clusters IV and X whereas lowest distance was
observed between cluster VI and VIII suggested a closer relationship between these clusters and low degree of diversity among the genotypes.
The maximum contribution towards divergence was accounted by plant height, seed index and yield per plant (~15% each) followed by fruits
per plant, juice-pulp ratio, pericarp thickness and flowers per cluster. Results also revealed that there was no association between clustering
pattern and eco-geographical distribution of genotypes. On the basis of the divergence study the genotypes could be selected from the most
divergent clusters for hybridization and further selection programme.