| Abstract Detail
Biogeography Kim, Seon-Hee [1], Maki, Masayuki [2], Lee, Sangryong [1], Kim, Seung-Chul [1]. Phylogeny and phylogeography of Symplocarpus and Lysichiton (Araceae; Orontioideae) in eastern Asia and North America. Subfamily Orontioideae includes three north temperate genera (Symplocarpus, Lysichiton, and Orontium) of the primarily tropical Araceae. Orontioideae and its monotypic sister subfamily Gymnostachydoideae are referred to as the proto Araceae and fossil evidence suggests Orontioideae dated back to the late Cretaceous in the temperate Northern Hemisphere. Genus Symplocapus includes five species and is disjunctly distributed in eastern Asia (EA) (4 spp.) and eastern North America (ENA) (1 sp.). Lysichiton has an intercontinental discontinuous distribution in EA (1 sp.) and western North America (WNA) (1 sp.). The monotypic genus Orontium is restricted to ENA. Phylogenetic analysis based on very limited sampling was conducted determining intercontinental disjunct event and its timing. However, detailed phylogenetic relationships among species within the genus and phylogeographic relationships within a disjunctly distributed species of Symplocarpus and Lysichiton are still lacking. Phylogenetic and biogeographic analyses of Symplocarpus based on extensive sampling (a total of 163 accessions, representing all five species from EA and ENA) found a deep divergence between two major lineages corresponding to their ploidy levels: a diploid lineage includes S. nipponicus, S. egorovii, and S. renifolius (Korea), while a tetraploid lineage consists of S. foetidus, S. nabekuraensis, and S. renifolius (Japan and Russia). Two distinct lineages of S. renifolius show marked cytological and morphological differences (e.g., chromosome number, spathe color, and spadix shape). The origin and diversification of these species were estimated to occur during mid Miocene. The estimated time of EA-ENA disjunct event is early to middle Miocene. A phylogeographic study of S. nipponicus from Korea (12 populations with 120 individuals) and Japan (16 populations with 156 individuals) was also conducted based on four highly variable chloroplast noncoding sequences. We found a total of 22 haplotypes and they were equally distributed between two countries (11 haplotypes for each country). There are no haplotypes shared between the populations from Korea and Japan. Furthermore, we found no geographical structuring in the haplotypes within each country. Two separate origins of the haplotypes in Korea were suggested from inferred ancestral haplotypes in Japan. A preliminary phylogeographic analysis of Lysichiton americanus was conducted using a total of 15 populations, ranging from the northernmost population of Alaska to the southernmost population of central California. The detailed phylogenetic and phylogeogrpahic patterns of Symplocarpus and Lysichiton will be presented.
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1 - Sungkyunkwan University, Biological Sciences, 2066 Seobu-ro, Suwon, Gyeonggi, 440-746, Korea
2 - TOHOKU UNIV, Botanical Gardens, Kawauchi 12-2, Aoba, SENDAI, MIYAGI, N/A, 980-0862, Japan
Keywords:
phylogeny
Phylogeography
Araceae
Gymnostachydoideae
Orontioideae
Lysichiton
Symplocarpus
intercontinental discontinuous distribution.
Presentation Type: Oral Paper
Session: 30, Biogeography I
Location: 203/Savannah International Trade and Convention Center
Date: Tuesday, August 2nd, 2016
Time: 1:45 PM
Number: 30002
Abstract ID:83
Candidate for Awards:None |
