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An overview of the higher level classification of Pucciniomycotina based on combined analyses of nuclear large and small subunit rDNA sequences

     USDA-ARS, Systematic Botany and Mycology Lab, Beltsville, Maryland 20705

P. Brandon Matheny

     Biology Department, Clark University, Worcester, Massachusetts 01610

Daniel A. Henk

     USDA-ARS, Systematic Botany and Mycology Lab, Beltsville, Maryland 20705

Elizabeth M. Frieders

     Department of Biology, University of Wisconsin, Platteville, Wisconsin 53818

R. Henrik Nilsson

     Göteborg University, Department of Plant and Environmental Sciences, Göteborg, Sweden

Meike Piepenbring

     J.W. Goethe-Universität Frankfurt, Department of Mycology, Frankfurt, Germany

David J. McLaughlin

     Department of Plant Biology, University of Minnesota, St Paul, Minnesota 55108

Les J. Szabo

     USDA-ARS, Cereal Disease Lab, University of Minnesota, St Paul, Minnesota 55108

Dominik Begerow

     Universität Tübingen, Spezielle Botanik und Mykologie, Tübingen, Germany

José Paulo Sampaio

     CREM, SABT, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal

Robert Bauer
Michael Weiß
Franz Oberwinkler

     Universität Tübingen, Spezielle Botanik und Mykologie, Tübingen, Germany

David Hibbett

     Biology Department, Clark University, Worcester, Massachusetts 01610

In this study we provide a phylogenetically based introduction to the classes and orders of Pucciniomycotina (= Urediniomycetes), one of three subphyla of Basidiomycota. More than 8000 species of Pucciniomycotina have been described including putative saprotrophs and parasites of plants, animals and fungi. The overwhelming majority of these (~90%) belong to a single order of obligate plant pathogens, the Pucciniales (= Uredinales), or rust fungi. We have assembled a dataset of previously published and newly generated sequence data from two nuclear rDNA genes (large subunit and small subunit) including exemplars from all known major groups in order to test hypotheses about evolutionary relationships among the Pucciniomycotina. The utility of combining nuc-lsu sequences spanning the entire D1–D3 region with complete nuc-ssu sequences for resolution and support of nodes is discussed. Our study confirms Pucciniomycotina as a monophyletic group of Basidiomycota. In total our results support eight major clades ranked as classes (Agaricostilbomycetes, Atractiellomycetes, Classiculomycetes, Cryptomycocolacomycetes, Cystobasidiomycetes, Microbotryomycetes, Mixiomycetes and Pucciniomycetes) and 18 orders.

Key words: basidiomycetes, molecular phylogenetics, parasitic fungi, rDNA systematics, Urediniomycetes

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