Main content area

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

Brurberg, May Bente, Elameen, Abdelhameed, Le, Vinh Hong, Nærstad, Ragnhild, Hermansen, Arne, Lehtinen, Ari, Hannukkala, Asko, Nielsen, Bent, Hansen, Jens, Andersson, Björn, Yuen, Jonathan
Fungal biology 2011 v.115 no.4-5 pp. 335-342
Phytophthora infestans, Solanum tuberosum, alleles, genetic techniques and protocols, genetic variation, genotype, loci, microsatellite repeats, pathogens, potatoes, sexual reproduction, Denmark, Finland, Norway, Scandinavia, Sweden
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.