title: Population dynamics of Phytophthora infestans in the Netherlands reveals expansion and spread of dominant clonal lineages and virulence in sexual offspring.
abstract: For a comprehensive survey of the structure and dynamics of the Dutch Phytophthora infestans population, 652 P. infestans isolates were collected from commercial potato fields in the Netherlands during the 10-year period 2000-2009. Genotyping was performed using 12 highly informative microsatellite markers and mitochondrial haplotypes. In addition, for each isolate, the mating type was determined. STRUCTURE analysis grouped the 322 identified genotypes in three clusters. Cluster 1 consists of a single clonal lineage NL-001, known as "Blue_13"; all isolates in this cluster have the A2 mating type and the Ia mitochondrial haplotype. Clusters 2 and 3 display a more elaborate substructure containing many unique genotypes. In Cluster 3, several distinct clonal lineages were also identified. This survey witnesses that the Dutch population underwent dramatic changes in the 10 years under study. The most notable change was the emergence and spread of A2 mating type strain NL-001 (or "Blue_13"). The results emphasize the importance of the sexual cycle in generating genetic diversity and the importance of the asexual cycle as the propagation and dispersal mechanism for successful genotypes. Isolates were also screened for absence of the Avrblb1/ipiO class I gene, which is indicative for virulence on Rpi-blb1. This is also the first report of Rpi-blb1 breakers in the Netherlands. Superimposing the virulence screening on the SSR genetic backbone indicates that lack the Avrblb1/ipiO class I gene only occurred in sexual progeny. So far, the asexual spread of the virulent isolates identified has been limited.
authors.affiliation: Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, 100081, Beijing, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Li
authors.forename: T A J
authors.initials: TA
authors.lastname: van der Lee
authors.forename: A
authors.initials: A
authors.lastname: Evenhuis
authors.forename: G B M
authors.initials: GB
authors.lastname: van den Bosch
authors.forename: P J
authors.initials: PJ
authors.lastname: van Bekkum
authors.forename: M G
authors.initials: MG
authors.lastname: Förch
authors.forename: M P E
authors.initials: MP
authors.lastname: van Gent-Pelzer
authors.forename: H M G
authors.initials: HM
authors.lastname: van Raaij
authors.forename: E
authors.initials: E
authors.lastname: Jacobsen
authors.forename: S W
authors.initials: SW
authors.lastname: Huang
authors.forename: F
authors.initials: F
authors.lastname: Govers
authors.forename: V G A A
authors.initials: VG
authors.lastname: Vleeshouwers
authors.forename: G J T
authors.initials: GJ
authors.lastname: Kessel
mesh_terms: D016000:Cluster Analysis; D004272:DNA, Mitochondrial / Q000235:genetics; D008040:Genetic Linkage; D005838:Genotype; D006239:Haplotypes; D018895:Microsatellite Repeats; D009426:Netherlands; D055750:Phytophthora infestans / Q000235:genetics* / Q000472:pathogenicity; D011110:Polymorphism, Genetic; D011157:Population Dynamics; D011198:Solanum tuberosum / Q000469:parasitology; D014774:Virulence / Q000235:genetics
chemical_list: D004272:DNA, Mitochondrial
keywords: Blue_13; avirulence; late blight; microsatellites; population genetics