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Variability of Peronospora Sparsa (syn. P. rubi) in Finland as Measured by Amplified Fragment Length Polymorphism

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Abstract

Downy mildew caused by Peronospora sparsa (syn. P. rubi) is a serious threat to commercial cultivation of arctic bramble (Rubus arcticus subsp. arcticus) in Finland. P. sparsa is distributed throughout the country in cultivated and wild arctic bramble and in cloudberry (R. chamaemorus). A total of 36 isolates of P. sparsa collected from these hosts was analysed for amplified fragment length polymorphism (AFLP). Of the 226 markers scored, 223 were polymorphic and all isolates of P. sparsa had unique AFLP fingerprints, which indicated high levels of genetic variability. An UPGMA clustering analysis of the isolates did not reveal any genetically distinguishable strains. The isolates were grouped neither according to the geographic origin nor the host from which they were isolated. Isolates of P. sparsa obtained from wild arctic bramble and one from cloudberry readily infected the leaves of the cultivated arctic bramble (cultivar ‘Pima’). Also, P. sparsa isolated from cultivated arctic bramble infected the leaves of wild arctic bramble. These data suggest that P. sparsa may be disseminated from wild arctic bramble and cloudberry to cultivated arctic bramble in the field.

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Authors and Affiliations

  1. Department of Plant Biology, Genetic Center, Swedish University of Agricultural Sciences (SLU), PO Box 7080, S-750 07, Uppsala, Sweden

    Hannele Lindqvist-Kreuze & Jari P.T. Valkonen

  2. Institute of Biotechnology, University of Helsinki, Finland

    Hannele Lindqvist-Kreuze

  3. Department of Applied Biology, University of Helsinki, PO Box 27, FIN-00014, Finland

    Hilkka Koponen

Authors
  1. Hannele Lindqvist-Kreuze
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  2. Hilkka Koponen
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  3. Jari P.T. Valkonen
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Correspondence to Jari P.T. Valkonen.

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Lindqvist-Kreuze, H., Koponen, H. & Valkonen, J.P. Variability of Peronospora Sparsa (syn. P. rubi) in Finland as Measured by Amplified Fragment Length Polymorphism. European Journal of Plant Pathology 108, 327–335 (2002). https://doi.org/10.1023/A:1015621931579

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