2025-11-18 東京科学大学
図1. 想定される麹菌の有性生殖の概略図と観察された内部の構造体
<関連情報>
- https://www.isct.ac.jp/ja/news/zdyl6oaldwyn
- https://www.isct.ac.jp/plugins/cms/component_download_file.php?type=2&pageId=&contentsId=1&contentsDataId=2602&prevId=&key=80807ebd8cd3d3883fe1beab540f80b5.pdf
- https://www.sciencedirect.com/science/article/abs/pii/S1878614625001357
産業用麹菌株の菌核内の新規内部構造の観察 Observation of novel internal structures within sclerotia of industrial Aspergillus oryzae strains
Kazunori Sawada, Takuji Yamada
Fungal Biology Available online: 9 October 2025
DOI:https://doi.org/10.1016/j.funbio.2025.101669
Highlights
- Ten industrial Aspergillus oryzae strains capable of forming sclerotia were newly identified
- Co-culture of specific strains under periodic CO2 regulation promoted morphological diversity of internal sclerotial structures
- The function of these internal structures remains unclear, though they superficially resemble reproductive organs in other Aspergillus species
Abstract
This study explored sclerotia-forming strains from industrial Aspergillus oryzae strains, focusing on factors contributing to sclerotial morphological diversity. Using rice bran medium, ten MAT1-1 industrial strains capable of producing sclerotia were newly identified. Phylogenetic analysis revealed that strains in the specific clade are particularly prone to sclerotia formation under the conditions tested. Controlled environmental conditions, including specific CO2 concentrations and incubation periods, facilitated the development of novel internal structures that have not been previously reported in A. oryzae. Although these internal structures resemble ascocarps found in other Aspergillus species, no evidence related to reproduction was identified. Further studies are necessary to elucidate the roles of these internal structures. The findings of this study provide a foundation for future research into the cryptic sexual reproduction of A. oryzae.
