Vol. 71 No: 6

Title:
Genetic Diversity in Nephelium as Revealed by Isozyme Polymorphism

Authors:
MALLIKARJUNA K. ARADHYA, F.T. ZEE and R.M. MANSHARDT

pp: 847-858

Abstract:
Sixty-four accessions involving five taxa (four species and two taxonomic varieties) of Nephelium were fingerprinted, classified, and evaluated for infraspecific genetic diversity using isozyme polymorphism. All five taxa were polymorphic for most of the ten putative loci encoding eight enzymes. Number of alleles per locus ranged from three for Gpi-1 to nine for Gpi-2 with a total of 58 alleles. Fifty-five accessions possessed unique fingerprints, indicating significant level of diversity in the collection. On average, 86% of the loci were polymorphic and the expected and observed heterozygosities were 0.390 and 0.402, respectively. Multivariate analyses of the isozyme data revealed five distinct clusters representing the five taxa included in the study. Isozyme data suggest that N. hypoleucum is the closest relative of N. lappaceum var. lappaceum. Interestingly, the N. lappaceum var. pallens exhibits closer association with N. ramboutan-ake than with its sibling taxon N. lappaceum var. lappaceum. The isozyme results dispute the taxonomic relationship among the taxa of Nephelium. However, further taxonomic and evolutionary inferences would require a much broader survey on a larger sampling basis.

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