Molecular Phylogeny of Insular Endemics of <i>Pittosporum</i> (<i>Pittosporaceae</i>) on the Ogasawara Islands

DOI

Bibliographic Information

Other Title
  • 小笠原諸島に固有のトベラ属（トベラ科）4 種における分子系統解析

Abstract

<p>The Ogasawara Islands are oceanic islands that harbor a unique flora with many endemic taxa. Four endemic species of Pittosporum inhabit the islands: P. boninense Koidz., P. beecheyi Tuyama, P. chichijimense Nakai ex Tuyama, and P. parvifolium Hayata. Each species has been considered to have rapidly diverged within the islands. To investigate this issue, we assessed the phylogenetic relationships among 55 species of Pittosporum, including the four Ogasawara endemics and their close relatives occurring in Japan and other countries, based on nuclear ribosomal internal transcribed spacer (ITS) sequences. The four endemics formed a robust monophyletic group, and their sister groups in East Asia consist of P. tobira (Thunb.) W. T. Aiton, P. illicioides Makino, and P. glabratum Lindl. ITS sequence differentiation among the four endemics was quite low. These findings suggest their recent and rapid speciation, derived from a single ancestor.</p>

Journal

Details 詳細情報について

  • CRID
    1390575340759036672
  • DOI
    10.51033/jjapbot.95_5_11036
  • ISSN
    24366730
    00222062
  • Text Lang
    ja
  • Data Source
    • JaLC
  • Abstract License Flag
    Allowed

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