GENETIC DIVERGENCE IN FRUIT AND STONE TRAITS OF Melia dubia Cav. IN INDIA

Thirty three Candidate Plus Trees (CPTs) of Melia dubia were selected based on the morphometric traits to identify suitable seed sources with clear bole and for production of quality seedlings for operational planting in different forestry and agroforestry programmes. Significant genetic variability and association were recorded among 33 CPTs for fruit and stone traits. Maximum 100 fruit weight (1.00 kg) was observed in Nagondapalli while maximum 100 seed weight (280 g) was observed in Kollegal 10. The stones were observed to have variations in their locule filling which could contribute to poor germination of seedlots. Locule filling was high in Kodipuram I (an average of 4 out of 5) which also recorded the highest germination. Mahalanobis’ D2 statistics and Tocher’s clustering method grouped the 33 seed sources into seven clusters when fruit characteristics were considered while the seed sources were grouped into 6 clusters when stone characteristics were considered. 100 Fruit Weight contributed maximum to divergence for fruits (87.88). Seedling traits in Melia dubia provide highest information on genetic divergence followed by stone traits. Fruits traits can also be considered when there is a need to further broaden the genetic base. Information on genetic divergence and genetic distance between genotypes helps in developing planting design to facilitate equal opportunity for hybridization among the genotypes. Seed orchards developed using genotypes from the clusters identified in the study would produce wider segregation. This will enhance the quality of seed produced in the ensuing generations and can be used for development of improved varieties