Aposymbiosis of a Burkholderiaceae-Related Endobacterium Impacts on Sexual Reproduction of Its Fungal Host

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  • Takashima Yusuke
    United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology Ibaraki University College of Agriculture
  • Degawa Yousuke
    Sugadaira Research Station Mountain Science Center, University of Tsukuba
  • Nishizawa Tomoyasu
    United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology Ibaraki University College of Agriculture
  • Ohta Hiroyuki
    United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology Ibaraki University College of Agriculture
  • Narisawa Kazuhiko
    United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology Ibaraki University College of Agriculture

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  • Aposymbiosis of a <i>Burkholderiaceae</i>-Related Endobacterium Impacts on Sexual Reproduction of Its Fungal Host

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<p>Bacterial endosymbionts inhabit diverse fungal lineages. Although the number of studies on bacteria is increasing, the mechanisms by which bacteria affect their fungal hosts remain unclear. We herein examined the homothallic isolate, Mortierella sugadairana YTM39, harboring a Burkholderiaceae-related endobacterium, which did not produce sexual spores. We successfully eliminated the bacterium from fungal isolates using ciprofloxacin treatment and asexual spore isolation for germinated asexual spores. Sexual spore formation by the fungus was restored by eliminating the bacterium from isolates. These results indicate that sexual reproduction by the fungus was inhibited by the bacterium. This is the first study on the sexual spore infertility of fungal hosts by endofungal bacteria.</p>

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