Figure 5.

XCP1 negatively regulates elf18-triggered defenses. A) and B) elf18-induced plant resistance to Psm ES4326 is enhanced in the xcp1 mutant. Experiments were performed as described in Fig. 2A. Significant differences were detected by 2-way ANOVA. Data are shown as means ± Sd (n = 8). The gl2 mutant was used as a control because the xcp1-2 and xcp1-3 mutants were in the g12 mutant background. C) Elf18-triggered phosphorylation of MPK3 and MPK6 is enhanced in the xcp1 mutant. Experiments were performed as described in Fig. 2B. D) and E) elf18-triggered ROS production is enhanced in the xcp1 mutant. Experiments were performed as shown in Fig. 2C. Significant difference were detected by Student’s t test. Data are shown as means ± Sem (n = 8). RLU, relative light units. *P < 0.05; **P < 0.01; ****P < 0.0001.