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.

中文翻译：

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一的Aposymbiosis Burkholderiaceae对其真菌宿主的有性生殖-相关Endobacterium影响

细菌内共生体栖息在不同的真菌谱系中。尽管对细菌的研究越来越多，但细菌影响真菌宿主的机制仍不清楚。我们在此检查了同种分离物，Mortierella sugadairana YTM39，它含有一种与伯克霍尔德氏菌科相关的内细菌，它不产生有性孢子。我们使用环丙沙星处理和对发芽的无性孢子的无性孢子分离成功地从真菌分离物中消除了细菌。通过从分离株中消除细菌，恢复了真菌的有性孢子形成。这些结果表明真菌的有性繁殖被细菌抑制。这是第一次研究真菌内细菌对真菌宿主的性孢子不育。