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Evolutionary relationships within the fungi: Analyses of nuclear small subunit rRNA sequences
- Source :
- Molecular Phylogenetics and Evolution. 1:231-241
- Publication Year :
- 1992
- Publisher :
- Elsevier BV, 1992.
-
Abstract
- 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.
- Subjects :
- Lineage (evolution)
Molecular Sequence Data
Monophyly
Ascomycota
Species Specificity
Sequence Homology, Nucleic Acid
Botany
RNA, Ribosomal, 18S
Genetics
Animals
Molecular Biology
Gene
Phylogeny
Ecology, Evolution, Behavior and Systematics
Zygomycota
Chytridiomycota
Base Sequence
biology
Basidiomycota
Fungi
RNA, Fungal
Ribosomal RNA
biology.organism_classification
Eukaryotic Cells
Evolutionary biology
Subjects
Details
- ISSN :
- 10557903
- Volume :
- 1
- Database :
- OpenAIRE
- Journal :
- Molecular Phylogenetics and Evolution
- Accession number :
- edsair.doi.dedup.....58f37a6f1102295fdbabf6e9629c8dc2
- Full Text :
- https://doi.org/10.1016/1055-7903(92)90020-h