Fine structure in ascosporogenesis of freeze-substituted Arthroderma
Haruo Ito1, Hiroshi Hanyaku1, Takashi Harada1
and Soichi Tanaka2
1Department of Dermatology, Tokyo Women's Medical University
Daini Hospital, Arakawa, Japan, and
We applied the freeze-substituion method to the detailed observation of
the ascosporogenesis in Arthroderma simii. The ascospore formation of A.
simii underwent the same processes as did that of other dermatophytes,
namely an enveloping membrane system (EMS) composed of two invaginated
unit membranes that delimit the daughter nuclei in the cytoplasm of the
ascus. The inner leaflet of the EMS was found to have changed into an ascospore
plasma membrane, whereas the outer leaflet and intercisternal space became
the ascospore cell wall.
2Department of Dermatology, Shiga University of Medical Science,
In the freeze-substituted asci, we could not observe the lomasomal
structure thought to be the origin of the EMS in dermatophytes.
In: Kushwaha RKS, Guarro J (Eds.). Biology
of Dermatophytes and other Keratinophilic Fungi.
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Revista Iberoamericana de Micología, Bilbao, 2000.