Genetic divergence studies in cluster bean genotypes
2017
Wankhade, R.S. | Kale, V.S. | Nagre, PK | Patil, R.K.
The present experiments were carried out at Department of Horticulture, Dr. PDKV, Akola and Regional Research Centre, Amravati during the years 2013–14 and 2014–15. Fifty five genotypes of cluster bean were assessed for genetic divergence using Mahalanobis D² technique. Among the characters studied in all four environmental conditions, gum content in seed (63.50%), plant spread (17.17%), number of primary branches per plant (4.65%), days to first flower (3.77%), hundred seed weight (2.09%), days to 50% flowering(1.95%), seed to husk ratio (1.68%) and ten dry pod weight (1.35%) contributed 95 percent to the total divergence. Genotypes were grouped into 8 clusters using Tocher's method. Cluster V was the largest group, involving 17 genotypes followed by twelve genotypes were grouped in cluster IV, eleven genotypes in cluster III and six genotype each in cluster I and II. The remaining solitary clusters (VI, VII and VIII) contained only one genotype each. The genotypes from the solitary clusters showed high divergence and useful in breeding. The intra-cluster distance ranged from 0 to 9.15. Cluster V possessed the highest intra-cluster distance (D²=9.15), followed by cluster IV (D²=6.34), cluster III (D²=4.71), cluster II (D²=3.31), and cluster I (D²=2.65). The clusters comprised of only one genotype had zero intra-cluster distance (cluster VI to VIII). The average inter-cluster distance reveled the maximum divergence(D²) between cluster V and VIII (D²=37.26) followed by cluster III and V (D²=29.92), cluster VI and VIII (D²=25.51). On the basis of inter cluster distance and performance observed in the present study a breeding programme involving genotypes for a specific character has been selected using cluster mean.
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