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Korean J. Pl. Taxon > Volume 48(4); 2018 > Article
Korean Journal of Plant Taxonomy 2018;48(4): 249-259.
doi: https://doi.org/10.11110/kjpt.2018.48.4.249
동아시아 물부추속 식물의 분자계통 및 식물지리학적 기원에 대한 고찰
최홍근1 , 정종덕2 , 나혜련2, 김호준3, 김창균4
1아주대학교 생명과학과
4가천대학교 생명과학과
Molecular phylogeny and the biogeographic origin of East Asian Isoёtes (Isoёtaceae)
Hong-Keun CHOI1 , Jongduk JUNG2 , Hye-Ryun NA2, Hojoon KIM3, Changkyun KIM4
1Department of Biological Sciences, Ajou University, Suwon 16499, Korea
2Northeastern Asia Biodiversity Institute, Seoul 05677, Korea
3Water Resources Research Center, Korea Water Resources Corporation, Daejeon 34350, Korea
4Department of Life Science, Gachon University, Seongnam 13120, Korea
Correspondence :  Hong-Keun CHOI ,Email: hkchoi@ajou.ac.kr
Changkyun KIM ,Email: ckim@gachon.ac.kr
Received: April 30, 2018  Revised: December 20, 2018   Accepted: December 22, 2018
Isoёtes L. (Isoёtaceae) is a cosmopolitan genus of heterosporous lycopods containing ca. 200 species being found in lakes, streams, and wetlands of terrestrial habitats. Despite its ancient origin, worldwide distribution, and adaptation to diverse environment, species in Isoёtes show remarkable morphological simplicity and convergence. Allopolyploidy appears to be a significant speciation process in the genus. These characteristics have made it difficult to assess the phylogenetic relationships and biogeographic history of Isoёtes species. In recent years, these difficulties have somewhat been reduced by employing multiple molecular markers. Here, we reconstruct the phylogenetic relationships in East Asian Isoёtes species. We also provide their divergence time and biogeographic origin using a fossil calibrated chronogram. East Asian Isoёtes species are divided into two clades: I. asiatica and the remaining species. Isoёtes asiatica from Hokkaido forms a clade with north-eastern Russian and western North American Isoёtes species. In clade I, western North America is the source area for the dispersal of Isoёtes to Hokkaido and northeastern Russia via the Bering land bridge during the late Miocene. The remaining Isoёtes species (I. sinensis, I. yunguiensis, I. hypsophila, I. orientalis, I. japonica, I. coreana, I. taiwanensis, I. jejuensis, I. hallasanensis) from East Asia form a sister group to Papua New Guinean and Australian species. The biogeographic reconstruction suggests an Australian origin for the East Asian species that arose through long-distance dispersal during the late Oligocene.
KeyWords: Isoёtes, East Asia, phylogenetic relationship, biogeographic origin, dispersal
주요어: 물부추속, 동아시아, 계통유연관계, 생물지리적 기원, 산포
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