Karyological characterization of meiosis, post-meiotic mitosis and nuclear migration in the ectomycorrhizal fungus Rhizopogon roseolus (= R. rubescens)

Karyological characteristics during basidiosporogenesis of Rhizopogon roseolus, a member of the hypogeous Agaricomycetes, were studied by light and transmission electron microscopy. More than 1000 tissue fragments of young basidiomata were stained with HCl-Giemsa and observed by a light microscopy t...

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Bibliographic Details
Published in:Mycologia 2012-09, Vol.104 (5), p.981-987
Main Authors: Shimomura, Norihiro, Sawada, Kiyomi, Aimi, Tadanori, Maekawa, Nitaro, Matsumoto, Teruyuki
Format: Article
Language:English
Subjects:
Basidia
Basidiomycota
Basidiomycota - genetics
Basidiomycota - physiology
Basidiomycota - ultrastructure
Basidiospores
CELL BIOLOGY/ULTRASTRUCTURE
Cell Nucleus - genetics
Cell Nucleus - physiology
Fruiting bodies
Fungal spores
Fungi
Fungi - genetics
Fungi - physiology
Germination
Meiosis
Meiosis - genetics
Meiosis - physiology
Mitosis
Mitosis - genetics
Mitosis - physiology
Mycorrhizae
nuclear migration
post-meiotic mitosis
Rhizopogon roseolus
Spores, Fungal - genetics
Spores, Fungal - physiology
Vacuoles
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Summary:Karyological characteristics during basidiosporogenesis of Rhizopogon roseolus, a member of the hypogeous Agaricomycetes, were studied by light and transmission electron microscopy. More than 1000 tissue fragments of young basidiomata were stained with HCl-Giemsa and observed by a light microscopy to evaluate nuclear behavior. Basidium morphology in the hymenium was observed by transmission electron microscopy. Meiosis and post-meiotic mitosis took place in the center of the basidium. Sterigmata appeared when the first meiotic division occurred, and the center of the basidium became constricted when the second meiotic division occurred. Asynchronous nuclear migration from the basidium into the basidiospores occurred after post-meiotic mitosis, producing eight uninucleate basidiospores. The nucleus migrated patchily into basidiospores. The pattern of post-meiotic mitosis of R. roseolus, in which post-meiotic mitosis took place in the center of the basidium, is reported for the first time.
ISSN:0027-5514
1557-2536
DOI:10.3852/11-279