ISSN 2167-0447
International Journal of Agricultural Sciences ISSN: 2167-0447 Vol. 5 (4), pp. 721-724, June, 2015. © International Scholars Journals
Full Length Research Paper
An evaluation of genetic divergence and cluster analysis studies of different apple genotypes using D2 statistics
Amartya V. Shankar
Department of Plant Breeding, Faculty of Agricultural Science, University of Madras, Chennai, India.
E-mail: [email protected]
Abstract
Medium quantum of genetic divergence was observed among sixteen apple genotypes under the present study. All the genotypes, on the basis of total variability were grouped into four distinct clusters. Maximum number of cultivars were accommodated in Cluster IV (Fuji, Gala, Jonadel, Jonagold, Red Fuji, Royal Gala and Spijon) followed by Cluster I (Arlet, Ruspippin, Sinta and Summerred), Cluster III (Crimson Gold, Elstar and Neomi) and Cluster II (‘Spartan’ and ‘Quinte’). Cluster IV had highest intra cluster value so was most divergent and Cluster I having least intra cluster value was least divergent. Highest value for inter cluster distance was recorded between Cluster I and II while it was lowest between Cluster III and IV. Cluster means were maximum in Cluster II followed by Clusters I, III and IV. Neomi is best cultivars for fruit yield/plant, fruit length, fruit diameter, fruit weight, total sugars and non-reducing sugars. However, Jonagold is best for TSS. Cultivars Spartan, Elstar, Royal Gala, Jonagold and Summerred would prove best for different vegetative characters.
Key words: Apple, cluster analysis, D2 statistics, genetic divergence.