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Peronospora odessana sp. nov., a downy mildew pathogen of a Tertiary relict species, Gymnospermium odessanum

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Abstract

A new species of Peronospora is described from Gymnospermium odessanum, a rare spring geophyte considered a Tertiary relict in the northwestern Black Sea region of Ukraine, Moldova and Romania. Phylogenetic analyses based on a combined matrix of the internal transcribed spacer-large subunit (ITS-LSU) ribosomal DNA (rDNA) and the mitochondrial cytochrome c oxidase subunit 1 (cox1) and cox2 genes demonstrate that it is a clearly distinct undescribed species. Morphological descriptions and illustrations of its oospores, conidiophores and conidia are provided. Despite its distinctive disease symptoms, the species has remained undetected until now, probably due to the rarity of its host. Peronospora odessana is the second species from Berberidaceae and is morphologically clearly distinct from P. achlydis on Achlys japonicus. The closest relatives of P. odessana were not revealed, but it is closely related to Peronospora bulbocapni, P. dicentrae and P. chrysosplenii, the hosts of which are also spring geophytes. Sequence data confirm that cox1 and cox2 are good barcoding loci; they show a similar number of nucleotide differences to its closest relatives.

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Acknowledgments

This study was supported by the Austrian Science Fund (FWF; project P22739-B20). Kit Tan is gratefully acknowledged for providing information on Gymnospermium maloi.

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Authors and Affiliations

  1. Division of Systematic and Evolutionary Botany, Department of Botany and Biodiversity Research, University of Vienna, Rennweg 14, 1030, Vienna, Austria

    Hermann Voglmayr

  2. Institute of Forest Entomology, Forest Pathology and Forest Protection, Department of Forest and Soil Sciences, BOKU-University of Natural Resources and Life Sciences, Peter Jordan-Straße 82, 1190, Vienna, Austria

    Hermann Voglmayr

  3. National Research Restoration Centre of Ukraine, Odessa Branch, 7 Voznesensky Str., 65058, Odessa, Ukraine

    Victoria G. Korytnianska

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  1. Hermann Voglmayr
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  2. Victoria G. Korytnianska
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Correspondence to Hermann Voglmayr.

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Voglmayr, H., Korytnianska, V.G. Peronospora odessana sp. nov., a downy mildew pathogen of a Tertiary relict species, Gymnospermium odessanum . Mycol Progress 14, 36 (2015). https://doi.org/10.1007/s11557-015-1059-6

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  • DOI: https://doi.org/10.1007/s11557-015-1059-6

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