Intraspecific divergence in seedling trees of Persian walnut (Juglans regia) for metric tree, foliage and floral characters in Himachal Pradesh, India
2005
Sharma, O.C. (Dr Y.S. Parmar University of Horticulture and Forestry, Nauni-Solan, Himachal Pradesh (India). Department of Fruit Breeding and Genetic Resources) | Sharma, S.D.
In order to assess the nature and magnitude of genetic divergence in seedling trees of Persian walnut (Juglans regia L.), a survey was conducted from 1997 to 1999. Non-hierarchical Euclidean cluster analysis was performed for 13 tree, foliage and floral characters of 229 seedling trees growing wild in four districts of Himachal Pradesh, India (Kullu, Mandi, Sirmaur and Chamba). Single-variate analysis of variance showed significant differences for many characters. The coefficient of variation was highest for yield (92.47%). All genotypes grouped into eight clusters. Walnut genotypes did not cluster according to their geographical origin. The largest number of genotypes (67) was in cluster 5 and the fewest (14) in clusters 2 and 7. In eigenvector analysis, the first component explained most variation (24.52%) and had the largest eigen-root value (3.187). Mean yield (105.36 kg) and yield efficiency (0.050 kg cm-2) were highest in clusters 2 and 1, respectively. Mean degree of dichogamy was lowest (23.37%) in cluster 7. Genotypes of clusters 2 and 7 were highly different from each other with an inter-cluster distance of 8.822, and can be used in breeding programmes to obtain good segregants and recombinants
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