Molecular evidence for ancient relicts of arctic-alpine plants in East Asia

Hajime Ikeda, Valentin Yakubov, Vyacheslav Barkalov, Hiroaki Setoguchi

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Summary: Following climate cooling at the end of the Tertiary, arctic-alpine plants attained most of their extant species diversity. Because East Asia was not heavily glaciated, the importance of this region as a location for the long-term persistence of these species and their subsequent endemism during the Pleistocene was proposed in early discussions of phytogeography. However, this hypothesis remains to be fully tested. Here, we address this hypothesis by elucidating the phylogenetic history of Phyllodoce (Ericaceae). A phylogenetic tree based on multiple nuclear loci revealed that Phyllodoce nipponica was not derived from widespread species such as the arctic-alpine Phyllodoce caerulea, but rather represented an independent lineage sister to the clade of widespread relatives. Molecular dating indicated a mid-Pleistocene divergence of P. nipponica. These findings exclude the hypothesis that P. nipponica was derived from an arctic-alpine species that extended its range southwards during recent glacial periods. Instead, our results support the hypothesis that P. nipponica is an ancestral species which persisted in the Japanese archipelago during the mid- and late Pleistocene. Our findings demonstrate support for the early proposal and shed light on the importance of the Japanese archipelago for the evolution and persistence of arctic-alpine species.

Original languageEnglish
Pages (from-to)980-988
Number of pages9
JournalNew Phytologist
Volume203
Issue number3
DOIs
Publication statusPublished - Aug 2014

Keywords

  • Arctic-alpine plants
  • Japanese archipelago
  • Nuclear DNA sequences
  • Phyllodoce
  • Phylogeography
  • Pleistocene

ASJC Scopus subject areas

  • Physiology
  • Plant Science

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