Submitted to: International Congress of Mycology Proceedings and Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 5/1/2002
Publication Date: 8/11/2002
Citation: MCLAUGHLIN, D.J., HANSON, R.W., FRIEDERS, E.M., SWANN, E.C., SZABO, L.J. ASCOMYCETOUS MITOSIS IN BASIDIOMYCETOUS YEASTS: ITS EVOLUTIONARY IMPLICATIONS. INTERNATIONAL CONGRESS OF MYCOLOGY PROCEEDINGS AND ABSTRACTS. 2002. The 7th International Mycological Congress Book of Abstracts. 727. Interpretive Summary:
Technical Abstract: In budding cells of ascomycetous yeasts, mitosis occurs in the parent, while in basidiomyceteous yeasts it occurs in the bud. However, in the basidiomycete Agaricostilbum pulcherrimum mitosis occurs in the parent and parent-bud junction. To test whether A. pulcherrimum has a novel mitotic pattern, investigations of additional yeasts in the Agaricostilbomycetidae (Urediniomycetes) utilized immunofluorescence localization of freeze-substituted material to visualize mitosis. In Bensingtonia yuccicola mitosis occurred in the bud, as in all other basidiomycetous yeasts studied to date, but in Stilbum vulgare it occurred in the parent. Stilbum vulgare also exhibited predominantly binucleate yeast cells. Nuclear rDNA sequence data showed that A. pulcherrimum and S. vulgare are more closely related to each other than to B. yuccicola in the Agaricostilbomycetidae. Evolutionary implications of these mitotic patterns will be considered.