Molecular Phylogenetics and Evolution
Vol. 1, No. 3, September, pp. 231-241.
Evolutionary relationships within the fungi:
Bruns, T. D., R. Vilgalys, S. M. Barns, D. Gonzalez, D. S.
Hibbett, D. J. Lane, L. Simon, S. Stickel, T. M. Szaro, W. G. Weisburg
and M. L. Sogin. 1992
analyses of nuclear small subunit rRNA sequences.
Department of Plant Pathology, University of California
Nucleotide sequences of the small subunit ribosomal RNA (18S) gene
were used to investigate evolutionary relationships within the Fungi.
The inferred tree topologies are in general agreement with traditional
classifications in the following ways: (1) the Chytridiomycota and
Zygomycota appear to be basal groups within the Fungi. (2) The
Ascomycota and Basidiomycota are a derived monophyletic group.
(3) Relationships within the Ascomycota are concordant with
traditional orders and divide the hemi- and euascomycetes into distinct
lineages. (4) The Basidiomycota is divided between the
holobasidiomycetes and phragmobasidiomycetes. Conflicts with
traditional classification were limited to weakly supported branches
of the tree. Strongly supported relationships were robust to minor
changes in alignment, method of analysis, and various weighting
schemes. Weighting, either of transversions or by site, did not
convincingly improve the status of poorly supported portions of the
tree. The rate of variation at particular sites does not appear to be
independent of lineage, suggesting that covariation of sites may be
an important phenomenon in these genes.
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