Figure 2.

Chemotaxis response of Xanthomonas oryzae pv. oryzae (Xoo) wild‐type strain to xylem sap and components of xylem exudate in the chemotactic capillary assay. Quantitative chemotactic capillary assay was performed with wild‐type Xoo and ΔfliC mutant 22‐µm filter‐sterilized xylem sap (A) and various sugars (1.8 mg/mL), amino acids [10 mg/mL, except for aspartate (5 mg/mL)], organic acids (1 mg/mL) and phosphate‐buffered saline (PBS) (control) (B). The relative chemotaxis response (RCR), which corresponds to the ratio of the number of bacteria in the test capillary to the number of bacteria in the control (PBS), for each respective strain is shown. Data are shown as the mean ± standard deviation (SD) (n = 6). *Statistically significantly different values compared with the value of the ∆fliC (motility control) strain (Student’s t‐test; P < 0.001). The experiments were repeated at least three times.