Genetic diversity among selected genotypes of M₄ generation in horsegram

Effect of different doses of gamma rays (5, 10, 15, 20, 25, 30, 35 and 40) in three varieties of horsegram viz., ‘AK-21’, ‘AK-42’ and ‘Maru-K-1’ was studied under field conditions at the Main Pulses Research Station, S. D. Agricultural University, Sardarkrushinagar during summer, 2004 to kharif, 2005. In all, eleven clusters were formed. Cluster I (34), followed by cluster IV (12), cluster V (4) and cluster VI (4) were found to be the largest. The highest inter-cluster distance was observed between cluster VI and cluster X. It was observed that the genotypes were clustered irrespective of their eco-geographical regions. Test weight was the main contributor towards the total divergence. Yield per plant, number of seeds per pod, pod length, days to maturity, plant height, days to 50% flowering and number of pods per plant had moderate contribution towards total divergence.