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Plant Biol (Stuttg) 2000; 2(1): 77-82
DOI: 10.1055/s-2000-9152
Original Paper
Georg Thieme Verlag Stuttgart ·New York

Allozyme Diversity in Populations of Cymbidium goeringii (Orchidaceae)

Mi  Yoon Chung, and Myong  Gi Chung
  • Department of Biology, Gyeongsang National University, The Republic of Korea
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Publication History

June 9, 1999

November 15, 1999

Publication Date:
31 December 2000 (online)

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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

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