To identify genes from the obligatory biotrophic oomycete Peronospora paras
itica that are expressed during infection in Arabidopsis thaliana we employ
ed cDNA-amplified fragment length polymorphism (AFLP) display. cDNA-AFLP fr
agments from infected and non-infected leaves were separated in parallel by
gel electrophoresis and displayed by autoradiography, Most differential ge
ne fragments were derived from P. parasitica.