Relative susceptibility of wsr plants to Plectosphaerella cucumerina. Three weeks-old Col-0, wsr1–2, wsr2–1, wsr3–1, wsr4–2, irx1–6 (resistance control) and agb1–1 (susceptibility control) plants were infected with the necrotrophic leaf pathogen isolate PcBMM. The relative fungal biomass was determined 5 days post infection (dpi) by qPCR analysis of the PcBMM β-tubulin gene. Bars represent mean values and error bars indicate SD (n = 4–6). Asterisks indicate statistically significant differences to the wild type accoding to Student‘s t test (*p < 0.05; **p < 0.01).