National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
As the information, on the nature and magnitude of variability for yield and other characters present in germplasm pool owing to genetic and non-genetic causes, is an important basic pre-requisite for starting any systematic breeding programme to identify superior lines or varieties. Thus, this investigation was undertaken involving 200 genotypes of tomato (Solanum lycopersicum L.) with following objective as genetic divergence studies in tomato. Genetic diversity among 200 tomato genotypes was worked out using D2 statistics. On the basis of genetic distance, these genotypes were grouped in to 8 clusters. Cluster-I topped in having maximum of 177 genotypes followed by cluster-II having 17 genotypes while remaining clusters cluster III, IV and V, VI, VII, VIII included one genotype each. Clustering was mainly due to either geographical locations or due to genotype. The maximum intra-cluster distance was observed in Cluster-II (2965.87) followed by Clusters-I (2384.00) which were identified genetically divergent. The maximum inter-cluster distance was noticed between Cluster-VII and Cluster-VIII showed maximum inter cluster distance (37547.80) followed by that between cluster-V and cluster-VIII (25781.20). Among 13 characters included for D2 analysis, Number of fruits per plant contributed maximum to divergence followed by plant height and have a major role in improvement of fruit yield in tomato. Therefore, crossing between genotypes belonging to Cluster- I and II as well as between Cluster- VII and III are expected to give maximum heterosis.
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