Reticulate evolution and phylogeography in Asarum sect. Asiasarum (Aristolochiaceae) documented in internal transcribed spacer sequences (ITS) of nuclear ribosomal DNA

Hiroki Yamaji, Tatsuya Fukuda, Jun Yokoyama, Jae Hong Pak, Chang zheng Zhou, Chun shu Yang, Kenji Kondo, Takashi Morota, Shuichi Takeda, Hiroshi Sasaki, Masayuki Maki

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

Phylogenetic analyses were performed for the taxonomically complicated group, Asarum sect. Asiasarum, using internal transcribed spacers (ITS) of nuclear ribosomal DNA. Direct sequences for 99 samples of a total of 14 taxa and geographic races and cloning analyses for 32 of these samples provided new insights that extensive reticulate evolution has occurred in this group. Eight taxa had slight or no polymorphism of the ITS sequences. On the other hand, the other five taxa had polymorphic ITS sequences composed of two ribotypes that were completely the same or almost the same as the sequences recognized in the taxa with only slight or no polymorphism, and were probably of diploid hybrid origin and to have retained their parental ribotypes. In terms of biogeographic implications, at least four interactions including migration, hybridization, and introgression, were presumed between the Japanese Archipelago and the continents, two times via a southern route, from the Korean Peninsula, and two times via a northern route, from Sakhalin or directly from the Eurasian continent.

Original languageEnglish
Pages (from-to)863-884
Number of pages22
JournalMolecular Phylogenetics and Evolution
Volume44
Issue number2
DOIs
Publication statusPublished - 2007 Aug

Keywords

  • Aristolochiaceae
  • Biogeography
  • Colonisation/migration
  • East Asia
  • Reticulate evolution

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Molecular Biology
  • Genetics

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