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Allozyme Diversity in Populations of Cymbidium goeringii (Orchidaceae)
Author(s) -
Chung Mi Yoon,
Chung Myong Gi
Publication year - 2000
Publication title -
plant biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 1435-8603
DOI - 10.1055/s-2000-9152
Subject(s) - biology , genetic diversity , orchidaceae , population , geographical distance , genetic distance , gene flow , genetic divergence , genetic variation , evolutionary biology , ecology , genetics , demography , gene , sociology
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.