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Phylogeny of the genus Pythium and description of new genera

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Mycoscience

Abstract

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.

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Authors and Affiliations

  1. Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8572, Japan

    Shihomi Uzuhashi & Makoto Kakishima

  2. Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Osaka, 599-8531, Japan

    Motoaki Tojo

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  1. Shihomi Uzuhashi
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  2. Motoaki Tojo
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  3. Makoto Kakishima
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Correspondence to Shihomi Uzuhashi.

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Uzuhashi, S., Tojo, M. & Kakishima, M. Phylogeny of the genus Pythium and description of new genera. Mycoscience 51, 337–365 (2010). https://doi.org/10.1007/s10267-010-0046-7

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  • DOI: https://doi.org/10.1007/s10267-010-0046-7

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