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<p>Seven isolates of three xerophilic <i>Myxotrichum</i> spp. and two isolates of xerophilic <i>Oidiodendron</i> sp. were obtained from honey in Japan. Four novel species are described in this study: <i>Myxotrichum aurantium</i> (NBRC 116384), <i>Myxotrichum cinereum</i> (NBRC 116056), <i>Myxotrichum limonium</i> (NBRC 116052), and <i>Oidiodendron atrovirens</i> (NBRC 116383). Molecular phylogenetic analysis based on a combined dataset of four regions: rRNA internal transcribed spacer, rRNA large subunit, minichromosome maintenance complex component 7, and RNA polymerase II largest subunit, revealed that <i>M. aurantium</i>, <i>M. cinereum</i>, and <i>M. limonium</i> formed an independent clade that is sister to <i>Myxotrichum chartarum</i>, and <i>O</i>. <i>atrovirens</i> formed an independent clade with <i>Myxotrichum setosum</i> and <i>Oidiodendron mellicola</i>. The three novel <i>Myxotrichum</i> spp. can be distinguished by differences in colony color, colony diameter on malt extract agar and oatmeal agar, conidium shape, optimal growth temperature and sucrose concentration in media, and ability to grow on alkalic media. <i>Oidiodendron atrovirens</i> can be distinguished from closely related species by colony color, presence of melanized conidia and conidiophores, optimal growth temperature, and sucrose concentration and pH in media.</p>

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Four novel xerophilic Myxotrichaceae species isolated from Japanese honey

  • 期刊论文

  • 发表日期：

    2025年2月6日

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  • Akari Okubo,
  • Tadashi Itagaki,
  • Dai Hirose

摘要

Seven isolates of three xerophilic Myxotrichum spp. and two isolates of xerophilic Oidiodendron sp. were obtained from honey in Japan. Four novel species are described in this study: Myxotrichum aurantium (NBRC 116384), Myxotrichum cinereum (NBRC 116056), Myxotrichum limonium (NBRC 116052), and Oidiodendron atrovirens (NBRC 116383). Molecular phylogenetic analysis based on a combined dataset of four regions: rRNA internal transcribed spacer, rRNA large subunit, minichromosome maintenance complex component 7, and RNA polymerase II largest subunit, revealed that M. aurantium, M. cinereum, and M. limonium formed an independent clade that is sister to Myxotrichum chartarum, and O. atrovirens formed an independent clade with Myxotrichum setosum and Oidiodendron mellicola. The three novel Myxotrichum spp. can be distinguished by differences in colony color, colony diameter on malt extract agar and oatmeal agar, conidium shape, optimal growth temperature and sucrose concentration in media, and ability to grow on alkalic media. Oidiodendron atrovirens can be distinguished from closely related species by colony color, presence of melanized conidia and conidiophores, optimal growth temperature, and sucrose concentration and pH in media.