Journal of FARM SCIENCES, Vol 22, No 5 (2009)

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Genetic divergence studies for tospovirus resistance, yield and yield related components in tomato genotypes

K.H. Yashavanta Kumar, Satish S. Patil, P.R. Dharmatti, A.S. Byadagi, S.T. Kajidoni, R.H. Patil

Abstract


Using Mahalanobis D2 statistics method, genetic diversity was studied. Seventy genotypes were grouped into seven different clusters. Cluster-I had 37 genotypes, cluster -II had 23 genotypes, cluster -III and IV had five and two genotypes respectively. While remaining cluster V, VI and VII were solitary clusters with single genotype. The D2 value ranged from 189.935 between cluster V and VI to 1484.249 between cluster I and V, indicating the existence of wide genetic variability.It is desirable to select accessions from the cluster having higher inter cluster distance and fruit yield with tolerance for tospovirus as parents in the recombination breeding programme. The cluster means were calculated for each character and ranks were given based on scores obtained for all the eleven characters of the cluster. Cluster-I with 37 genotypes ranked first. Similarly other clusters VI, VII and III were next in order of ranking and can be utilized in further breeding programme.

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