Evolutionary Relationships within the Fungi: Analyses of Nuclear Small Subunit rRNA Sequences

被引:245
作者
Bruns, Thomas D. [1 ]
Vilgalys, Rytas [2 ]
Barns, Susan M. [3 ]
Gonzalez, Dolores [2 ]
Hibbett, David S. [2 ]
Lane, David J. [4 ]
Simon, Luc [5 ]
Stickel, Shawn [6 ]
Szaro, Timothy M. [1 ]
Weisburg, William G. [4 ]
Sogin, Mitchell L. [6 ]
机构
[1] Univ Calif Berkeley, Dept Plant Pathol, Berkeley, CA 94720 USA
[2] Duke Univ, Dept Bot, Durham, NC 27706 USA
[3] Indiana Univ, Dept Biol, Bloomington, IN 47405 USA
[4] GENE TRAK Syst, Framingham, MA 01701 USA
[5] Univ Laval, Fac Foresterie & Geomat, Ctr Rech Biol Forestiere, Ste Foy, PQ G1K 7P4, Canada
[6] Marine Biol Lab, Ctr Mol Evolut, Woods Hole, MA 02543 USA
关键词
D O I
10.1016/1055-7903(92)90020-H
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
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. (C) 1992 Academic Press, Inc.
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页码:231 / 241
页数:11
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