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Hyaloperonospora erucae sp. nov. (Peronosporaceae; Oomycota), the downy mildew pathogen of arugula (Eruca sativa)

Abstract

Arugula (or rocket; Eruca sativa) is a popular leafy vegetable often used as a salad. Downy mildew disease poses a major threat to the cultivation of this crop. Along with a quick expansion of the cultivated land of arugula, significant losses due to this disease are continuously reported worldwide. Previous studies have attributed arugula downy mildew to Hyaloperonospora parasitica (previously classified under Peronospora), applying a broad species concept, or to Peronospora erucastri, but the identity of that the causal agent is still unproven. Based on both morphology and molecular phylogeny, the arugula pathogen is revealed to be distinct from the above two species in the current study. Consequently, Hyaloperonospora erucae sp. nov. is described and illustrated, and P. erucastri affecting Erucastrum spp. is transferred to the genus Hyaloperonospora as H. erucastri comb. nov., based on morphology and phylogenetic position.

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Acknowledgements

We are grateful to Dr. Rolf Delhey for providing a specimen of rocket down mildew from Argentina. YJC was supported by the fellowship from the Alexander von Humboldt foundation, Germany, and the grants from the National Institute of Biological Resources (NIBR), funded by of the Ministry of Environment (MOE) and the National Research Foundation of Korea (NRF), funded by the Ministry of Science, ICT & Future Planning (2016R1C1B2008013), Republic of Korea. MT was supported by the LOEWE excellence initiative of the federal government of Hessen, in the framework of the cluster for Integrative Fungal Research (IPF).

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Choi, YJ., Kruse, J. & Thines, M. Hyaloperonospora erucae sp. nov. (Peronosporaceae; Oomycota), the downy mildew pathogen of arugula (Eruca sativa). Eur J Plant Pathol 151, 549–555 (2018). https://doi.org/10.1007/s10658-017-1389-0

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Keywords

  • Brassicaceae
  • cox2 mtDNA
  • ITS rDNA
  • Quarantine
  • Species concept