Figure 3. The P. c. subsp. carotovorum budAB operon affects bacterial modification of pH in tubers slices that are incubated anaerobically.

Potato slices were inoculated with 10⁶ CFU and incubated under aerobic (A) and anaerobic conditions (B) for 20 hours at room temperature (∼22°C). PR: pH indicator phenol red (yellow at pH below 6.4 and red violet at pH above 8.2), BP: pH indicator bromocresol purple (yellow at pH below 5.2 and purple at a pH above 6.8).