Toward resolving family-level relationships in rust fungi (Uredinales) |
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Authors: | M Catherine Aime |
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Institution: | (1) Systematic Botany and Mycology Laboratory, USDA Agricultural Research Service, Beltsville, MD 20705, USA |
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Abstract: | Rust fungi (Basidiomycota, Uredinales) consist of more than 7000 species of obligate plant pathogens that possess some of
the most complex life cycles in the Eumycota. Traditionally, a limited number of synapomorphic characters and incomplete life-cycle
and host-specificity data have hampered phylogenetic inference within the Uredinales. The application of modern molecular
characters to rust systematics has been limited, and current contradictions, especially in the deeper nodes, have not yet
been resolved. In this study, two nuclear rDNA genes (18S and 28S) were examined across the breadth of the Uredinales to resolve
some systematic conflicts and provide a framework for further studies of the group. Three suborders of rusts are recovered.
Of the 13 rust families most widely accepted, 8 are supported in full or in part (Coleosporiaceae, Melampsoraceae, Mikronegeriaceae,
Phakopsoraceae p.p., Phragmidiaceae, Pileolariaceae, Pucciniaceae, Raveneliaceae), 3 are redundant (Cronartiaceae, Pucciniastraceae,
Pucciniosiraceae), and the status of 2 (Chaconiaceae, Uropyxidaceae) could not be resolved. The Mikronegeriaceae and Caeoma torreyae are the most basal rusts sampled. It is concluded that morphology alone is a poor predictor of rust relationships at most
levels. Host selection, on the other hand, has played a significant role in rust evolution.
Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information
and does not imply recommendation or endorsement by the US Department of Agriculture. |
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Keywords: | Molecular systematics Pathogenic fungi Rust taxonomy Urediniomycetes |
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