@ARTICLE{TreeBASE2Ref17208, author = {Alexandra Riethmueller and Hermann Voglmayr and Markus Goeker and Michael Weiss and Franz Oberwinkler}, title = {Phylogenetic relationships of the downy mildews (Peronosporales) and related groups based on nuclear large subunit ribosomal DNA sequences.}, year = {2002}, keywords = {LSU rDNA; molecular evolution; Oomycota; Peronosporomycetidae; plant pathogen}, doi = {}, url = {http://www.mycologia.org/cgi/content/abstract/94/5/834}, pmid = {}, journal = {Mycologia}, volume = {94}, number = {}, pages = {834--849}, abstract = {In order to investigate phylogenetic relationships of the Peronosporomycetes (Oomycetes), nuclear large subunit ribosomal DNA sequences containing the D1 and D2 region were analysed of 92 species belonging to the orders Peronosporales, Pythiales, Leptomitales, Rhipidiales, Saprolegniales and Sclerosporales. The data were analysed applying methods of neighbor-joining as well as maximum parsimony, both statistically supported using the bootstrap method. The results confirm the major division between the Pythiales and Peronosporales on the one hand and the Saprolegniales, Leptomitales and Rhipidiales on the other. The Sclerosporales were shown to be polyphyletic; while Sclerosporaceae are nested within the Peronosporaceae, the Verrucalvaceae are merged within the Saprolegniales. Within the Peronosporomycetidae, Pythiales as well as Peronosporales as currently defined are polyphyletic. Albugo is the most basal, well-supported lineage, followed by a Pythium-Lagenidium clade. The third, highly supported clade comprises the Peronosporaceae together with Sclerospora, Phytophthora and Peronophythora. Peronophythora is placed within Phytophthora, indicating that both genera should be merged. Bremiella is clearly nested within the genus Plasmopara and polyphyletic, suggesting a transfer to Plasmopara. The species of Peronospora do not appear as a monophyletic group. Peronospora species growing on Brassicaceae form a highly supported clade.} }

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