Figure 4.

Both local generation/emission and systemic perception/propagation of airborne SAR signals depends on BXL4. Col-0 and bxl4-1 sender plants were spray-inoculated with either 10⁸ cfu/mL of Pst/AvrRpm1 (S) or a corresponding mock (M) solution. Sender plants were co-incubated in desiccators with naïve receiver plants. Three days later, leaves of receiver plants were inoculated with 10⁵ cfu/mL of Pst. The resulting in planta Pst titers in Col-0 (A) and bxl4-1 (B) receiver plants were evaluated at 4 dpi. Box plots represent average Pst titers from four to seven biologically independent experiments, including at least 3 replicates each ± min and max values. Letters above the box plots indicate statistically significant differences for means (one-way ANOVA and Tukey’s test for P=<0.05, for (A, Col-0 receivers): F(3, 118)=37.26, Col-0 M n=30, Col-0 S n=32, bxl4-1 M n=30, bxl4-1 S n=30; for (B, bxl4-1 receivers): F(3, 63)=3.383, Col-0 M n=17, Col-0 S n=17, bxl4-1 M n=16, bxl4-1 S n=17).