Phylogenetic relationships of the downy mildews (Peronosporales) and related groups based on nuclear large subunit ribosomal DNA sequences - PubMed (original) (raw)
Phylogenetic relationships of the downy mildews (Peronosporales) and related groups based on nuclear large subunit ribosomal DNA sequences
A Riethmüller et al. Mycologia. 2002 Sep-Oct.
Abstract
In order to investigate phylogenetic relationships of the Peronosporomycetes (Oomycetes), nuclear large subunit ribosomal DNA sequences containing the D1 and D2 region were analyzed of 92 species belonging to the orders Peronosporales, Pythiales, Leptomitales, Rhipidiales, Saprolegniales and Sclerosporales. The data were analyzed 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. The well supported Albugo clade appears to be the most basal 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 seems to be polyphyletic within the genus Plasmopara, 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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