01250nas a2200217   4500008004100000245007400041210006900115260001200184300001400196490000700210520056500217653001200782653002600794653002200820653001600842653001600858100001600874700001300890700001200903856011700915       2008                        eng d00aTwo new species of Isoetes (Isoetaceae) from Jeju Island, South Korea0 aTwo new species of Isoetes Isoetaceae from Jeju Island South Kor  c2008///  a354 - 3580 v513 aWe name and describe two new species, Isoetes jejuensis and I. hallasanensis, from Jeju Island, South Korea. These taxa are compared with related species in East Asia, including I. coreana and I. sinensis. The rugulate megaspore ornamentation of I. jejuensis differs from those other Isoetes species. Furthermore, I. hallasanensis varies from I. asiatica in its microspore ornamentation and chromosome number, although both species have an echinate megaspore ornamentation. These new species are tetraploid (2n = 44), whereas I. coreana is hexaploid (2n = 66).10aIsoetes10aIsoetes hallasanensis10aIsoetes jejuensis10aJeju Island10aNew species1 aChoi, H.-K.1 aJung, J.1 aKim, C.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-54249107417&partnerID=40&md5=b04955ae3773d8cafcac8c63a387913702236nas a2200229   4500008004100000245011500041210006900156260001200225300001200237490000700249520148500256653001701741653001401758653002201772653002001794653002501814653000901839100001201848700001301860700001601873856011701889       2008                        eng d00aGenetic diversity and population structure of endangered Isoetes coreana in South Korea based on RAPD analysis0 aGenetic diversity and population structure of endangered Isoetes  c2008///  a43 - 490 v893 aIsoetes coreana Chung and Choi is on the list of critically endangered species in South Korea. Using randomly amplified polymorphic DNA (RAPD) markers, we investigated the genetic diversity within and between seven local populations of I. coreana. Ten RAPD primers produced a total of 94 bands, of which 59 (62.8%) were polymorphic. A low level of genetic diversity was recognized within the populations of I. coreana: polymorphic loci (P), with values ranging from 3.4% to 33.9%, and a mean value of 15.5% being observed. Analysis of molecular variance (AMOVA) showed that genetic diversity was greater among populations (81.6%) than within populations (19.7%) or among the three regions included in this study (Han River, Youngsan River, and Nakdong River). In addition, a high degree of genetic differentiation (θB = 0.742) was detected among the populations. These results indicate that genetic differentiation has occurred very rapidly. However, the rate of gene flow between populations was found to be as low as 0.059, irrespective of the genetic and geographical distances between the populations, which indicates that genetic drift must have played an important role in forming the present populations of I. coreana. Because a reduction of genetic diversity as a result of genetic drift is undesirable, increasing the gene flow between populations of Korean quillwort I. coreana should be considered as a conservation strategy. © 2008 Elsevier B.V. All rights reserved.10aConservation10aGene flow10aGenetic diversity10aIsoetes coreana10aPopulation structure10aRAPD1 aKim, C.1 aNa, H.R.1 aChoi, H.-K.  uhttp://www.scopus.com/inward/record.url?eid=2-s2.0-43049156535&partnerID=40&md5=6ec64294ed27758f6ffbdd47207484c0