Phylogeny of the genus <i>Pythium</i> and description of new genera

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  • Uzuhashi Shihomi
    Graduate School of Life and Environmental Sciences, University of Tsukuba, Japan
  • Tojo Motoaki
    Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Japan
  • Kakishima Makoto
    Graduate School of Life and Environmental Sciences, University of Tsukuba, Japan

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  • Phylogeny of the genus Pythium and description of new genera

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Abstract

<p>Phylogeny of the genus Pythium is analyzed based on sequences of the large subunit ribosomal DNA D1/D2 region and cytochrome oxidase II gene region of Pythium isolates and comprehensive species of related taxa belonging to the Oomycetes. The phylogenetic trees show that the genus Pythium is a highly divergent group and divided into five well- or moderately supported monophyletic clades. Each clade is characterized by sporangial morphology such as globose, ovoid, elongated, or filamentous shapes. Based on phylogeny and morphology, the genus Pythium (s. str.) is emended, and four new genera, Ovatisporangium, Globisporangium, Elongisporangium, and Pilasporangium, are described and segregated from Pythium s. lato.</p>

Journal

  • Mycoscience

    Mycoscience 51 (5), 337-365, 2010

    The Mycological Society of Japan

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