Characteristics of the five Phytophthora infestans genotypes used in the experimental setup.

All isolates were chosen for having the same mating type. The virulence profile corresponds to the ability of pathogen genotype to infect potato genotype containing resistance genes (numbered from 1 to 11). Avr3a genotype is given for the two single nucleotide polymorphisms at the positions 241 and 312 of the avr3a gene, which are responsible for the virulence profile towards the resistance gene number 3 (named R3). A341/T312 genotype corresponds to a parasite genotype unable to infect a potato genotype containing the R3 resistance gene (see virulence profile of BP3), whereas G241/G312 genotype corresponds to parasite genotype able to overcome the R3 resistance gene (see virulence profile of all but BP3).