Jateen Kumar, Sonali Kar and Pavani Naga Durga Veligatla
The genetic divergence study conducted with 28 aromatic short grain genotypes revealed significant differences among the genotypes for the yield, its components and grain quality characteristics. Both Tocher's and Euclidian techniques of divergence investigation classified the genotypes into five clusters based on the relative magnitude of D2 values. Cluster IV with 8 genotypes was the largest cluster followed by Cluster I with 7 genotypes, Cluster V with 6 genotype, Cluster II with 4 genotype and Cluster III with 3 genotypes. The intra Cluster distance ranged from 2.420 (Cluster I) to 2.826 (Cluster II) and highest intra Cluster distance observed within Cluster V (2.946). The inter cluster distance remained maximum between Cluster V and IV (5.467) suggesting that the crosses involving varieties from these Clusters would give wider and desirable recombination. To appreciate much variability and high heterotic effect, parents would be selected from clusters having wider inter cluster distance. Cluster V included 6 genotypes, viz., NVSR 604, R 1656-1251-1-412-1, R 2369-475-2-252-1, NVSR 603, IGKV DH 66, BRR 2180, which showed highest cluster mean values for total number of grains per panicle (428.67), harvest index (48.68), grain yield (42.83), number of panicles per square meter (41.35), panicle length (27.23), test weight (23.46), number of effective tillers per plant (9.46) and flag leaf width (1.68). Thus, the genotypes (NVSR 604, R 1656-1251-1-412-1, R 2369-475-2-252-1, NVSR 603, IGKV DH 66, BRR 2180) of these clusters having high mean value could be directly used in crop improvement programme as parents.
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