Figure 1

Detached leaflet assay of potato plants. Potatoes (cv. Desiree) were foliar sprayed either with 36 mM proalexin (Potassium phosphite; phosphite treated) or tap water (Water treated). “Covered leaves” leaflets were obtained by covering two leaves per plant during phosphite spray. Washed leaflets were obtained by spraying leaves with 36 mM proalexin, washing and drying away the phosphite present on the leaves. Infection was measured as lesion size 7 days after inoculation with P. infestans. Data corresponds to mean ± SD obtained from 12 biological replicates.