@ARTICLE{TreeBASE2Ref17820, author = {Marco Thines and M. G?ker and Sabine Telle and Malcolm Ryley and Kusum Mathur and Y. D. Narayana and Otmar Spring and Ram P. Thakur}, title = {Phylogenetic relationships of graminicolous downy mildews based on coxII sequence data}, year = {2007}, keywords = {}, doi = {}, url = {}, pmid = {}, journal = {Mycological Research}, volume = {}, number = {}, pages = {}, abstract = {Graminicolous downy mildews (GDM) are an understudied yet economically important group of plant pathogens, which are one of the major constraints to poaceous crops in the tropics and subtropics. Here we present a first molecular phylogeny based on cox2 sequences comprising all genera of the GDM currently accepted, with both lasting (Graminivora, Poakatesthia, and Viennotia) and evanescent (Peronosclerospora, Sclerophthora, and Sclerospora) sporangiophores. In addition, all other downy mildew genera currently accepted, as well as a representative sample of other oomycete taxa, have been included. It could be shown that all genera of the GDM each have had a long independent evolution history and that the delineation between Peronosclerospora and Sclerospora is correct. Sclerophthora was found to be a particularly divergent taxon nested within a paraphyletic Phytophthora, but without support. The results confirm that the placement of Peronosclerospora and Sclerospora in the Saprolegniomycetidae is incorrect. Sclerophthora is not closely related to Pachymetra of the family Verrucalvaceae, and also does not belong to the Saprolegniomycetidae, but shows close affinities to the Peronosporaceae. In addition, all GDM are interspersed throughout the Peronosporaceae sensu lato, suggesting that the keeping of a separate family for the Sclerosporaceae might not be justified.} }

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