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Tanahara, Ai,Maki, Masayuki The Korean Society of Weed Science and The Turfgra 2010 Weed Biology and Management Vol.10 No.2
In this study, we examined the genetic diversity in three populations of the critically endangered annual, Bidens cernua, in Japan by using inter-simple sequence repeat markers and compared our data with those from two common congeners: Bidens radiata var. pinnatifida and Bidens tripartita. In contrast to our expectations, the degree of genetic diversity at the species level was higher in B. cernua than in B. radiata var. pinnatifida or B. tripartita. At the population level, the degree of genetic diversity was highest in B. cernua.These results may be ascribed to the mating system and method of seedbank formation in B. cernua. An analysis of molecular variance revealed relatively high genetic differentiation among the populations of all three species. We concluded that the distribution width could not be an index of genetic variability in Bidens examined in this study.
이웅,양지영,정금선,박재홍,Masayuki Maki,김승철 한국식물학회 2017 Journal of Plant Biology Vol.60 No.2
Two major modes of speciation, i.e., cladogenesis and anagenesis, have often been used to explain the generation of distinct plant diversity on oceanic islands. Anagenetic speciation is of particular interest to plant endemics on Ulleung Island, Korea because, of nearly 40 endemics, approximately 88% or even all endemic species are thought to be anagenetically derived. Despite its important role in Ulleung Island, the full scope of the anagenetic speciation and the genetic consequences of this speciation mode have been limited to a very few families (i.e., Apiaceae, Sapindaceae, and Ranunculaceae). Based on extensive sampling (a total of 322 individuals) and trnL-F cpDNA noncoding sequences, we conducted phylogenetic and haplotype network analyses for the species pair of Rubus crataegifolius (continental progenitor)-R. takesimensis (insular derivative). Rubus takesimensis on Ulleung Island is not a monophyletic group, suggesting at least two independent introductions from geographically and genetically divergent source populations. No significant reduction in cpDNA haplotype diversity and genetic differentiation in R. takesimensis are consistent with expectations from the anagenetically derived species. A further study based on comprehensive sampling and more variable molecular markers will shed light into the genetic consequences of anagenetic speciation in Rubus on Ulleung Island.
Chung, Mi Yoon,L?pez-Pujol, Jordi,Maki, Masayuki,Kim, Ki-Joong,Chung, Jae Min,Sun, Byung-Yun,Chung, Myong Gi published for the Association by Oxford University 2012 The Journal of heredity Vol.103 No.5
<P>We hypothesized that the main Korean mountain ranges provided many refugia for boreal plant species, where they likely found relatively stable habitats and maintained large population sizes. Under this scenario, high levels of genetic variation and low degree of differentiation among populations within these species were anticipated. To test this hypothesis, we examined levels of allozyme diversity (17 loci) in 12 populations of the common terrestrial montane orchid Oreorchis patens from the main ranges in Korea and 4 populations of its rare congener O. coreana, which is restricted to the Korean island of Jeju. As expected, O. patens harbored high levels of genetic variation within populations (%P = 62.8, A = 1.96, H (o) = 0.211, and H (e) = 0.237). Allele frequency differences among populations were low (F (ST) = 0.075), and the species also displayed a significant correlation between pairwise genetic differentiation and geographical distance. All these results suggest that extant populations were founded by multiple genetically diverse individuals and that most of this initial diversity would have been maintained in the stable mountainous conditions during Quaternary climatic oscillations. In contrast, we were unable to detect any genetic diversity in O. coreana, suggesting that contemporary populations likely originated from a single ancestral source population that had lost all genetic variability. From a long-term conservation genetics perspective, extreme rarity and small population sizes, coupled with its apparent genetic uniformity, place O. coreana at a high risk of extinction. Thus, both in situ and ex situ conservation efforts should be of particular importance for this species.</P>