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Genetic analysis of Phytophthora infestans populations in the Nordic European countries reveals high genetic variability

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  • May Bente Brurberg, Bioforsk, Norway
  • Abdelhameed Elameen, Denmark
  • Ving Hong Le, Bioforsk, Norway
  • Ragnhild Nærstad, Denmark
  • Arne Hermansen, Denmark
  • Ari Lehtinen, Denmark
  • Asko Hannukkala, Denmark
  • Bent J Nielsen, Denmark
  • Jens Grønbech Hansen
  • Bjørn Andersson, Denmark
  • Jonathan Yuen, Denmark
  • Department of Agroecology and Environment
  • Department of Integrated Pest Management
  • Climate and Bioenergy
  • Pesticide Research and Environmental Chemistry
Late blight, caused by the oomycete Phytophthora infestans, is the most important disease of
potato (Solanum tuberosum). The pathogen is highly adaptable and to get an overview of the
genetic variation in the Nordic countries, Denmark, Finland, Norway and Sweden we have
analyzed 200 isolates from different fields using nine simple-sequence repeat (SSR)
markers. Forty-nine alleles were detected among the nine SSR loci and isolates from all
four Nordic countries shared the most common alleles across the loci. In total 169 multilocus
genotypes (based on seven loci) were identified among 191 isolates. The genotypic diversities,
quantified by a normalized Shannon’s diversity index (Hs), were 0.95 for the four
Nordic countries. The low FST value of 0.04 indicates that the majority of variation is found
within the four Nordic countries. The large number of genotypes and the frequency distribution
of mating types (60 % A1) support the hypothesis that sexual reproduction is contributing
notably to the genetic variation of P. infestans in the Nordic countries.
Original languageEnglish
JournalFungal Biology
Volume115
Issue4-5
Pages (from-to)335-342
Number of pages8
ISSN1878-6146
Publication statusPublished - 1 May 2011

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