Two novel Peronospora species are associated with recent reports of downy mildew on sages

Young Joon Choi, Hyeon Dong Shin, Marco Thines

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    52 Citations (Scopus)

    Abstract

    Recently, downy mildew of Salvia species became economically relevant globally, but the taxonomy of the causal agent remains still obscure. The objective of this study was to characterize and distinguish the different Peronospora species associated with downy mildew on sages, based on morphological and molecular data. For this purpose we compared Peronospora specimens on Salvia officinalis and Salvia plebeia with Peronospora swinglei, including the type specimen on Salvia reflexa. We observed that three Peronospora species are associated with downy mildew on sages, and the recent outbreak of the disease on S. officinalis and S. plebeia is associated with two undescribed species, contrasting the view that either P. swinglei or Peronospora lamii is the causal agent of the downy mildew disease as claimed previously by several studies. In the study presented here, we provide the formal descriptions and illustrations for the two newly introduced taxa, Peronospora salviae-plebeiae and Peronospora salviae-officinalis. The three species of Peronospora investigated seem to be restricted to specific species of Salvia: P. swinglei to S. reflexa, P. salviae-plebeiae to S. plebeia, and P. salviae-officinalis to S. officinalis. Speciation may be allopatric and closely linked to the geographic distributions of their host plants.

    Original languageEnglish
    Pages (from-to)1340-1350
    Number of pages11
    JournalMycological Research
    Volume113
    Issue number12
    DOIs
    Publication statusPublished - 2009 Dec

    Bibliographical note

    Funding Information:
    The authors are grateful to the director and curator of the herbarium BPI for allowing access to specimens in their keeping, and to Catherine Jennifer Erhardt (MSU) for sending downy mildew samples. This work was financially supported by research grants from the BioGreen 21 program (no. 20080401034028), Rural Development Administration, Republic of Korea, as well as the German Science Foundation (DFG) and the Elite Programm for Postdocs of the Landesstiftung Baden-Württemberg for MT.

    Keywords

    • Cox2 mtDNA
    • Geographic origin
    • Host specificity
    • ITS rDNA
    • Peronosporaceae
    • Taxonomy

    ASJC Scopus subject areas

    • Biotechnology
    • Ecology, Evolution, Behavior and Systematics
    • Genetics
    • Plant Science

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