Journal
MYCOSCIENCE
Volume 62, Issue 5, Pages 289-296Publisher
MYCOLOGICAL SOC JAPAN
DOI: 10.47371/mycosci.2021.05.002
Keywords
Cochliobolus heterostrophus; exocytosis; membrane traffic; sexual reproduction
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Funding
- Japan Society for the Promotion of Science [15K07311, 15H05249, 19K06052]
- Grants-in-Aid for Scientific Research [19K06052, 15K07311, 15H05249] Funding Source: KAKEN
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The study on the function of the Sec5 gene in Bipolaris maydis reveals its impact on hyphal growth and pathogenicity, as well as abnormal development of ascospores in sexual reproduction.
In this study, we identified Sec5 in Bipolaris maydis, a homologue of Sec5 in Saccharomyces cerevisiae and a possible exocyst component of the fungus. To examine how Sec5 affects the life cycle of B. maydis, we generated null mutant strains of the gene (dsec5). The Asec5 strains showed a strong reduction in hyphal growth and a slight reduction in pathogenicity. In sexual reproduction, they possessed the ability to develop pseudothecia. However, all ascospores were aborted in any of the asci obtained from crosses between Asec5 and the wild-type. Our cytological study revealed that the abortion was caused by impairments of the post-meiotic stages in ascospore development, where ascospore delimitation and young spore elongation occur.
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