Abstract:
Using 14 allozyme loci, we investigated levels of genetic diversity within populations,
and degree of genetic divergence among 24 populations of Cymbidium goeringii (Orchidaceae) in Korea and Japan. Cymbidium goeringii maintains high levels of genetic diversity both at population (mean expected heterozygosity,
H
e = 0.238) and species levels (0.260). Means of H
e found in 24 populations were not significantly different from each other. About 90
% of the total variation in the species is common to all populations (mean G
ST = 0.108). No unique allele was found in any population. The indirect estimate of
gene flow based on the mean G
ST was high (Nm = 2.06). Nei's genetic identities for pairs of populations had high values (mean
= 0.974 [SD = 0.013]). The Mantel-Z test showed a significant correlation between
genetic distance and geographic distance. However, the mean G
ST value between 17 populations in Korea and seven Japanese populations was relatively
low (0.029), even though the land connection between the southern Korean peninsula
and southern Japanese archipelagos has not existed since the middle Pleistocene. Large
numbers of small seeds of C. goeringii might travel long distances by wind from populations to populations both in Korea
and Japan, increasing genetic diversity within populations and maintaining low genetic
differentiation among populations.
Key words:
Allozymes -
Cymbidium goeringii
- gene flow - genetic diversity - divergence in Korea and Japan
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Myong Gi Chung
Department of Biology Gyeongsang National University
Chinju 660-701
The Republic of Korea
Section Editor: R. Aerts
Email: mgchung@nongae.gsnu.ac.kr
