Entity

Time filter

Source Type


Kim C.,Ajou University | Kim C.,CAS Kunming Institute of Botany | Jung J.,Ajou University | Na H.R.,Ajou University | And 6 more authors.
Journal of Plant Biology | Year: 2012

Genetic variation of nuclear ribosomal ITS (nrITS) and chloroplast DNA (cpDNA) regions was investigated in Brasenia schreberi (Cabombaceae) to assess the population structure and to infer the evolutionary relationship among 12 populations distributed in South Korea. The combined sequence of the two regions was aligned to 2,069 bp, of which 28 sites were variable. In total, 20 genotypes were identified from 240 individuals of B. schreberi. Genotype diversity (Gd) and nucleotide diversity (Pi) on Jeju Island (Gd = 0.2511, Pi = 0.00012) were higher than those of the mainland of South Korea (Gd = 0.1358, Pi = 0.00005). The relatively low level of genetic variation of the mainland populations is associated with its higher genetic differentiation (G ST = 0.095 on mainland and 0.039 on Jeju Island) and human activities. Minimum spanning network analysis demonstrated that the investigated populations of B. schreberi were subdivided into two geographical groups: the mainland of South Korea and Jeju Island. In addition, analysis of molecular variation showed that a large proportion (73.55%) of genetic differentiation existed between the two regions. These results strongly suggest the presence of significant barriers to gene flow between regions. Thus, the management unit for B. schreberi should be carefully designed to avoid the potential risk that can results from the admixture of individuals from the mainland and Jeju Island regions. © 2011 The Botanical Society of Korea. Source


Chung M.Y.,Gyeongsang National University | Lopez-Pujol J.,University of Barcelona | Maki M.,Tohoku University | Moon M.-O.,Jeju National University | And 2 more authors.
Journal of Heredity | Year: 2013

It is thought that the warm-temperate vegetation of Korea, which at present is limited to southern coastal areas, was founded by individuals from glacial refugia putatively located in southern Japan and/or southern China. Two scenarios of postglacial recolonization can be hypothesized: 1) extant Korean populations are derived from multiple source populations or, 2) they originated from a single source. To test which of these scenarios is more likely, we surveyed patterns of genetic diversity in 3 congeneric terrestrial orchids that are typical of Korean warm-temperate vegetation, Calanthe discolor, C. sieboldii, and C. reflexa. In total, we studied 14 populations with 17 allozyme loci. To complement the study, we also tested the 2 scenarios with previous population-genetics data reported for other warm-temperate plant species native to Korea. Levels of genetic variation in the 3 Calanthe species were substantially higher than those typical of allozyme-based studies in other terrestrial orchid species, which clearly suggest a pattern of postglacial recolonization fitting the first scenario. However, previous studies with native Korean species showed equivocal patterns and suggest conflicting scenarios. The Calanthe species studied here and the previous genetic surveys conducted on other species indicate that the establishment of contemporary warm-temperate vegetation in Korea has been diverse since deglaciation. From a conservation perspective, C. reflexa should be regarded as endangered in Korea, needing special attention to preserve its current genetic diversity and to prevent further decreases in population sizes. © The American Genetic Association. 2012. All rights reserved. Source


Les D.H.,University of Connecticut | Peredo E.L.,University of Connecticut | Peredo E.L.,The Ecosystems Center | Tippery N.P.,University of Connecticut | And 12 more authors.
Aquatic Botany | Year: 2015

Genetic studies of nonindigenous populations can help to determine their geographical origin, whether single or multiple introductions have occurred, and provide evidence of hybridization. We broadly surveyed Najas minor populations at several nuclear and chloroplast loci. Sequence data were obtained from nonindigenous N. minor populations in North America and portions of its native range in Europe (Italy) and Asia (China, Korea). North American populations were mapped to evaluate the observed patterns of genetic variation geographically. We detected multiple genotypes of N. minor in collections originating from within Eurasia and North America. In North America, the presence of two, distinct, widespread genotypes indicated at least two separate introductions. These genotypes shared partial genetic similarity with accessions from China. Two other genotypes (restricted to Michigan, Ohio, and West Virginia) represented either additional introductions of hybrid plants, and/or post-introduction hybrid events that occurred in North America. The existence of several genotypes among nonindigenous North American N. minor populations indicates a history of multiple introductions, and raises concerns over the potential proliferation of novel hybrid genotypes in this region. Because the two main genotypes essentially remain allopatric, management efforts should focus on preventing their contact, which could result in proliferation of hybrid plants with enhanced invasive attributes. © 2015 Elsevier B.V. Source


Kim C.,Ajou University | Kim C.,CAS Kunming Institute of Botany | Na H.R.,Northeastern Asia Plant Institute | Jung J.,Ajou University | And 4 more authors.
Journal of Ecology and Field Biology | Year: 2012

Determination of the minimum population size is an important component for the ex situ conservation of an endangered species. Here, we present the identification of collection strategies that most efficiently captured the genetic diversity of Brasenia schreberi J.F. Gmelin (water-shield) in natural populations from the mainland (MGC) and Jeju Island (JNS) of South Korea, using amplified fragment length polymorphism (AFLP) markers. A total of 313 and 383 polymorphic bands were detected in the MGC and JNS populations, respectively. All of the 140 sampled ramets were distinguishable by the presence of distinct AFLP phenotypes. According to the simulation of the individual sampling by maximization sampling, 25 and 28 individuals captured all of the genetic diversity in the MGC population (mainland of South Korea) and the JNS population (Jeju Island), respectively. The level of genetic diversity of the core collections was similar to the entire collection, indicating that the core collections very well represent the diversity of the entire collection. We therefore suggest a management unit of B. schreberi based on the genetic information for assessing the minimum population size for its ex situ conservation. © The Ecological Society of Korea. Source

Discover hidden collaborations