TITLE Genetic and clonal structure in Korean populations of Calystegia japonica (Convolvulaceae)
AUTHOR Seung Tae Kim
Department of Biology, Pusan National University, Pusan 609-735, The Republic of Korea
Myong Gi Chung
Department of Biology, Gyeongsang National University, Chinju 660-701, The Republic of Korea
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ABSTRACT The genetic and genotypic diversity of Korean Calystegia japonica Choisy populations were investigated using starch gel electrophoresis. Calystegia japonica is a clonal plant species that inhabits fields and roadsides and reproduces vegetatively by rhizomes. Although populations of the species are small, isolated, and distributed in patches, the species maintains a moderate level of genetic diversityˇX60% of the loci examined were polymorphic and the mean genetic diversity within populations (HeP) was 0.099. The mean number of multilocus genotypes per population was 11.6, and the genotypic diversity index (DG) was 0.74. Slightly more than 38% of the total genetic variation was found among populations (GST = 0.383). In addition, significant differences in allele frequency were detected among populations at all loci examined (P < 0.001), suggesting low gene flow among Korean populations. Indirect estimates of the number of migrants per generation (Nm) were 0.40 (calculated from GST) and 0.20 (calculated from the mean frequency of five private alleles). Widespread geographical distribution, isolated populations in patchy distribution, clonal reproduction with relatively high genotypic diversity, low gene flow among populations, fragmentation of a once continuous range, and genetic drift may have played roles in shaping the population genetic structure of the species.
KEYWORD Calystegia japonica; Clonal diversity; Gene flow; Genetic diversity; Genetic drift; Population genetic structure;
ARTICLE INFO Botanical Bulletin of Academia Sinica, Volume 36 Number 3 July 1995, page 135-141, 7 pages
PUBLISHER Institute of Plant and Microbial Biology, Academia Sinica, Taipei, Taiwan, Republic of China