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著作: Li Yue/Tada Fumito/[山城 考]/Maki Masayuki/Long-term persisting hybrid swarm and geographic difference in hybridization pattern: genetic consequences of secondary contact between two Vincetoxicum species (ApocynaceaeAsclepiadoideae)/[BMC Evolutionary Biology]

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311237
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2016年6月3日(金) 15:17:54
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三好 小文
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山城 考
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種別 必須 学術論文(審査論文)
言語 必須 英語
招待 推奨
審査 推奨 Peer Review
カテゴリ 推奨 研究
共著種別 推奨 国際共著(徳島大学内研究者と国外研究機関所属研究者との共同研究)
学究種別 推奨
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著者 必須
  1. (英) Li Yue
    役割 任意
    貢献度 任意
    学籍番号 推奨
  2. (英) Tada Fumito
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    貢献度 任意
    学籍番号 推奨
  3. 山城 考([徳島大学.大学院社会産業理工学研究部.生物資源産業学域.生物生産系.生物資源生産科学分野]/[徳島大学.生物資源産業学部.生物資源産業学科.生物生産システム講座])
    役割 任意
    貢献度 任意
    学籍番号 推奨
  4. (英) Maki Masayuki
    役割 任意
    貢献度 任意
    学籍番号 推奨
題名 必須

(英) Long-term persisting hybrid swarm and geographic difference in hybridization pattern: genetic consequences of secondary contact between two Vincetoxicum species (ApocynaceaeAsclepiadoideae)

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(英) During glacial periods, glacial advances caused temperate plant extirpation or retreat into localized warmer areas, and subsequent postglacial glacial retreats resulted in range expansions, which facilitated secondary contact of previously allopatric isolated lineages. The evolutionary outcomes of secondary contact, including hybrid zones, dynamic hybrid swarm, and resultant hybrid speciation, depends on the strengths of reproductive barriers that have arisen through epistatic and pleiotropic effects during allopatric isolation. The aim of this study was to demonstrate refugia isolation and subsequent secondary contact between two perennial Asclepioid species and to assess the genetic consequences of the secondary contact. We modeled the range shift of two ecologically distinct Vincetoxicum species using the species distribution model (SDM) and assessed the genetic consequences of secondary contact by combining morphological and genetic approaches. We performed morphometric analysis (592 individuals) and examined 10 nuclear microsatellites (671 individuals) in V. atratum, V. japonicum, and putative hybrid populations. Multivariate analysis, model-based Bayesian analysis, and non-model-based discriminant analysis of principal components confirmed the hybridization between V. atratum and V. japonicum. High pollen fertility and a lack of linkage disequilibrium suggested that the hybrid populations may be self-sustaining and have persisted since V. atratum and V. japonicum came into contact during the post-glacial period. Moreover, our findings show that the pattern of hybridization between V. atratum and V. japonicum is unidirectional and differs among populations. Geographically-isolated hybrid populations exist as genetically distinct hybrid swarms that consist of V. atratum-like genotypes, V. japonicum-like genotypes, or admixed genotypes. In addition, Bayesian-based clustering analysis and coalescent-based estimates of long-term gene flow showed patterns of introgressive hybridization in three morphologically 'pure' V. japonicum populations. In this study, we demonstrated that climatic oscillations during the Quaternary period likely led to species range shift and subsequently secondary contact. Hybrid populations may be self-sustaining and have persisted since V. atratum and V. japonicum came into contact during the post-glacial period. Pattern of hybridization between V. atratum and V. japonicum is unidirectional and differs among populations. We concluded that these differences in the genetic consequences of secondary contact are caused by historical colonization processes and/or natural selection.

キーワード 推奨
発行所 推奨 BioMed Central Ltd.
誌名 必須 BMC Evolutionary Biology([BioMed Central Ltd.])
(eISSN: 1471-2148)
ISSN 任意 1471-2148
ISSN: 1471-2148 (eISSN: 1471-2148)
Title: BMC evolutionary biology
Title(ISO): BMC Evol Biol
Publisher: BioMed Central
 (NLM Catalog  (Scopus  (CrossRef (Scopus information is found. [need login])
必須 16
必須 ---
必須 20 20
都市 任意
年月日 必須 2016年 1月 22日
URL 任意
DOI 任意 10.1186/s12862-016-0587-2    (→Scopusで検索)
PMID 任意 26801608    (→Scopusで検索)
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Scopus 任意 2-s2.0-84961129151
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指導教員 推奨
備考 任意
  1. (英) Article.ELocationID: 10.1186/s12862-016-0587-2

  2. (英) Article.PublicationTypeList.PublicationType: Journal Article

  3. (英) Article.PublicationTypeList.PublicationType: Research Support, Non-U.S. Gov't

  4. (英) OtherID: PMC4724111