Fig. 7.

Egg extract‐induced systemic acquired resistance reduces Hyaloperonospora arabidopsidis Noco2 infection. Effect of 1 d‐pretreatment with Pieris brassicae egg extract (EE) on H. arabidopsidis infection in distal leaves was measured 8 d after inoculation. Inoculated plants without pretreatment were used as controls. Percentage of systemically infected plants (a) or number of spores on systemic leaves (b) were quantitated. Mean values ± SE of three independent experiments are shown (n = 4–5 per experiment). Significant differences between control and treated plants are indicated ((a) Pearson's chi‐squared test; (b) Welch’s two sample t‐test; ***, P < 0.001; ns, not significant).