FIG 1.

Chemotactic responses to plant-related compounds by R. pseudosolanacearum wild-type strain Ps29. Bacterial cells were grown in RSM medium for 4 h after preculture in CPG medium. Digital image processing was used to count the number of bacteria around the mouth of a capillary containing the test compound and 1% (wt/vol) agarose. Compounds were used at a concentration of 5 mM. Buffer indicates 10 mM HEPES buffer as a negative control. Videotape frames were analyzed at the initiation of observation and 1 min after initiation. Normalized cell numbers were calculated by dividing the number of bacterial cells at 1 min by that at the initiation of observation. Vertical bars represent the standard errors for measurements done at least in triplicate.