Phi effectiveness against Hpa in different Arabidopsis-deficient signaling mutants. Col-0 wild-type plants (WT) as well as sid2-1, jar1-1, ein2-1, aba1-5, and npr1 mutants were treated with MES (as mock) or Phi (10 mm) and inoculated as described in the legend of Figure 1. The effectiveness of Phi was calculated as in the legend of Figure 2. Values are means ± se of 15 replicates from five biological independent experiments. Letters indicate significant differences between values (ANOVA, Newman-Keuls test; P < 0.05). Means ± se of spore numbers quantified on mock-pretreated plants of the wild type and sid2-1, npr1, jar1-1, ein2-1, and aba1-5 mutants were 610 ± 18, 1,200 ± 25, 625 ± 12, 610 ± 16, 595 ± 15, and 554 ± 13 spores mg−1 fresh weight, respectively.