@ARTICLE{TreeBASE2Ref28395, author = {Swarnalatha Moparthi and Michael Bradshaw and Binod Pandey and Uwe Braun and Jamjan Meeboon and Suzanne Rooney Latham and Megan Romberg and Gary Grove}, title = {Phylogeny and taxonomy of Podosphaera cerasi sp. nov., and Podosphaera prunicola s. lat.}, year = {2018}, keywords = {Evolution, Taxonomy}, doi = {}, url = {http://}, pmid = {}, journal = {Mycological Progress}, volume = {}, number = {}, pages = {}, abstract = {Powdery mildew of Prunus spp. is a significant disease in most? cherry growing regions of Washington (USA). Powdery mildew on Prunus virginiana and Prunus avium were previously assigned to Podosphaera clandestina s. lat. (= P. oxyacanthae) or P. prunicola. In this report, we confirm the presence of two distinct Podosphaera species of on these hosts, in Washington on Prunus virginiana and in California and Oregon on P. avium. Phylogenetic analyses of ITS and LSU sequences of rDNA regions for specimens on these two hosts confirmed the presence of two distinct species. A morphological comparison of these species with type material of Podosphaera prunicola and numerous additional collections, demonstrated that the powdery mildew on Prunus virginiana (including var. demissa and var. melanocarpa) is in fact P. prunicola. The application of the name P. prunicola by genetic analysis was determined by epitypification. Podosphaera prunicola, originally described in Wyoming, USA, has been introduced in Europe and was confirmed in this study? from the first European collection, a Prunus serotina specimen from Germany. The powdery mildew on Prunus avium is genetically, morphologically and biologically distinct from P. prunicola and and is described herein as Podosphaera cerasi sp. nov. Maximum parsimony analysis of sequences of the ITS region and part of the 28SrDNA of P. cerasi isolates showed a close evolutionary relationship with P. prunicola. Cross inoculation experiments confirmed that these two species are host specific. Podosphaera prunicola was unable to colonize Prunus avium while Podospahera cerasi was unable to colonize Prunus virginiana. Morphological re-examinations of numerous P. prunicola s. lat. specimens on a wide range of Prunus species suggest that P. prunicola is likely confined to species of Prunus subgen. Padus (= Prunus subgen. Cerasus sect. Laurocerasus, incl. sect. Padus), with Prunus virginiana as the principal host. Podosphaera cerasi, however, occurs on Prunus subgen. Cerasus species. Podosphaera specimens from various members of subgen. Prunus are morphologically similar to P. cerasi. Morphological deviations of these Podosphaera species from P. cerasi exist and suggest that additional, undescribed, Podosphaera species are hidden under P. prunicola s. lat. Future research should focus on molecular analyses of Podosphaera collections on a wider range of Prunus hosts. The present work includes the first documented and genetically proven European record of P. prunicola, on P. serotina and confirms the widespread occurrence in the US of a newly described species of powdery mildew on P. avium. } }

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