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Contributions of rpb2 and tef1 to the phylogeny of mushrooms and allies (Basidiomycota, Fungi)
Ist Teil von
Molecular phylogenetics and evolution, 2007-05, Vol.43 (2), p.430-451
Ort / Verlag
United States: Elsevier Inc
Erscheinungsjahr
2007
Quelle
MEDLINE
Beschreibungen/Notizen
A phylogeny of the fungal phylum Basidiomycota is presented based on a survey of 160 taxa and five nuclear genes. Two genes,
rpb2, and
tef1, are presented in detail. The
rpb2 gene is more variable than
tef1 and recovers well-supported clades at shallow and deep taxonomic levels. The
tef1 gene recovers some deep and ordinal-level relationships but with greater branch support from nucleotides compared to amino acids. Intron placement is dynamic in
tef1, often lineage-specific, and diagnostic for many clades. Introns are fewer in
rpb2 and tend to be highly conserved by position. When both protein-coding loci are combined with sequences of nuclear ribosomal RNA genes, 18 inclusive clades of Basidiomycota are strongly supported by Bayesian posterior probabilities and 16 by parsimony bootstrapping. These numbers are greater than produced by single genes and combined ribosomal RNA gene regions. Combination of nrDNA with amino acid sequences, or exons with third codon positions removed, produces strong measures of support, particularly for deep internodes of Basidiomycota, which have been difficult to resolve with confidence using nrDNA data alone. This study produces strong boostrap support and significant posterior probabilities for the first time for the following monophyletic groups: (1) Ustilaginomycetes plus Hymenomycetes, (2) an inclusive cluster of hymenochaetoid, corticioid, polyporoid, Thelephorales, russuloid, athelioid, Boletales, and euagarics clades, (3) Thelephorales plus the polyporoid clade, (4) the polyporoid clade, and (5) the cantharelloid clade. Strong support is also recovered for the basal position of the Dacrymycetales in the Hymenomycetidae and paraphyly of the Exobasidiomycetidae.