Pseudomonas is one of the most common plant pathogens, and can infect a wide range of species. However, infection potential varies greatly between individual Pseudomonas isolates, in part due to their specific repertoire of effectors. I am interested in how genetic variation of both host and pathogen impacts the outcome of infection. To address this question, I use a natural Arabidopsis – Pseudomonas pathosystem, as Arabidopsis thaliana is a host to different strains of Pseudomonas species in the wild.