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

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

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 Peronosporadrabae 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.

Original languageEnglish
Pages (from-to)151-159
Number of pages9
JournalMycopathologia
Volume171
Issue number2
DOIs
Publication statusPublished - 2011

Keywords

  • Host range
  • Obligate parasites
  • Peronosporaceae
  • Species concept

ASJC Scopus subject areas

  • Microbiology
  • Applied Microbiology and Biotechnology
  • Agronomy and Crop Science
  • veterinary (miscalleneous)

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