, Volume 171, Issue 2, pp 151–159 | Cite as

Reclassification of Two Peronospora Species Parasitic on Draba in Hyaloperonospora Based on Morphological and Molecular Phylogenetic Data

  • Young-Joon Choi
  • Hyeon-Dong Shin
  • Hermann Voglmayr


On the family Brassicaceae, the causal agent responsible for downy mildew disease was originally regarded as a single species, Peronospora parasitica (now under Hyaloperonospora), but it was recently reconsidered to consist of many distinct species. In this study, 11 specimens of Peronospora drabae and P. norvegica parasitic on the genus Draba were investigated morphologically and molecularly. Pronounced differences in conidial sizes (P. drabae: 14–20 × 12.5–15.5 μm; P. norvegica: 20–29 × 15.5–22 μm) and 7.8% sequence distance between their ITS1-5.8S-ITS2 rDNA sequences confirmed their status as distinct species. Based on ITS phylogeny and morphology (monopodially branching conidiophores, flexuous to sigmoid ultimate branchlets, hyaline conidia and lobate haustoria), the two species unequivocally belong to the genus Hyaloperonospora and not to Peronospora to which they were previously assigned. Therefore, two new combinations, Hyaloperonospora drabae and H. norvegica, are proposed. The two taxa are illustrated and compared using the type specimen for H. norvegica and authentic specimens for H. drabae, which is lectotypified.


Host range Obligate parasites Peronosporaceae Species concept 



The authors are grateful to the herbarium curators of the U.S. National Fungus Collections (BPI), the Royal Botanic Gardens Kew (K), the Botanical Museum Oslo (O), the Naturhistorisches Museum Wien (W) and the Universität Wien (WU) for providing the Peronospora specimens. Financial support via a research grant from the Korea University to H. D. S. in 2007 and a EU SYNTHESYS grant (GB-TAF-4625) to H. V. for a research stay at the Royal Botanic Gardens Kew are gratefully acknowledged.


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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Young-Joon Choi
    • 1
  • Hyeon-Dong Shin
    • 2
  • Hermann Voglmayr
    • 3
  1. 1.Institute of Environment and Ecology, College of Life Sciences and BiotechnologyKorea UniversitySeoulKorea
  2. 2.Division of Environmental Science and Ecological EngineeringKorea UniversitySeoulKorea
  3. 3.Department of Systematic and Evolutionary Botany, Faculty Center BiodiversityUniversity of ViennaWienAustria

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