Abstract
Based on morphological and molecular data, it is shown that two distinct Hyaloperonospora species parasitize Draba (syn. Erophila) verna sensu lato. Hyaloperonospora praecox is described and illustrated as a new species, and detailed descriptions and illustrations including the diagnostic disease symptoms, haustoria and oogonia are provided for H. erophilae for the first time. Based on morphological and ITS sequence data, Peronospora drabae-majusculae is synonymised with H. erophilae. Hyaloperonospora praecox differs from H. erophilae by pyriform haustoria, by non-systemic infection combined with inconspicuous infection symptoms, and by slightly larger conidia. Both species were observed on Draba verna sensu stricto and Draba boerhaviae, and do not show a host preference. Molecular and morphological evidence is presented that H. erophilae and H. praecox can co-occur in the same host population.
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Acknowledgements
We thank the curators of the herbaria BEO, K, NEU, O and WU for providing herbarium specimens. Special thanks are due to Boris Ivancevic (BEO) for information on the incorrect numbering of the original material of P. drabae-majuscula. Financial support to Hermann Voglmayr by an EU SYNTHESYS grant (GB-TAF-4625) for a research stay at Herbarium Kew and to Markus Göker by the Deutsche Forschungsgemeinschaft is gratefully acknowledged.
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Voglmayr, H., Göker, M. Morphology and phylogeny of Hyaloperonospora erophilae and H. praecox sp. nov., two downy mildew species co-occurring on Draba verna sensu lato. Mycol Progress 10, 283–292 (2011). https://doi.org/10.1007/s11557-010-0699-9
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DOI: https://doi.org/10.1007/s11557-010-0699-9