Molecular Biology and Evolution, Vol 9, 285-296, Copyright © 1992 by Society for Molecular Biology and Evolution
BH Bowman, JW Taylor, AG Brownlee, J Lee, SD Lu and TJ White
Establishing the phylogeny of fungi and protists often has proved difficult
owing to the simple morphologies and convergent characters in these
organisms. We used DNA sequences of nuclear small-subunit ribosomal RNA
genes to determine phylogenetic relationships among three major classes of
organisms considered to be fungi--Basidiomycetes, Ascomycetes and
Chytridiomycetes--and to assess the taxonomic position of Neocallimastix,
an economically important anaerobic rumen microorganism whose
classification is controversial. The Basidiomycetes and Ascomycetes, two
classes of nonflagellated fungi, are the most closely related taxa.
Chytridiomycetes, though bearing flagella, group with these higher fungi
rather than with the protists. Neocallimastix, a eukaryote lacking
mitochondria and variously classified as a protist or as a fungus, shows
closest molecular affinities with the Chytridiomycete fungi in the order
Spizellomycetales.
ORIGINAL ARTICLE
Molecular evolution of the fungi: relationship of the Basidiomycetes, Ascomycetes, and Chytridiomycetes
Roche Molecular System, Alameda, California 94501.
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