FIG. 3.

Cell-to-cell aggregation of wild-type X. fastidiosa A05 and gacA mutant DAC1984. (A) Cell-to-cell aggregation of X. fastidiosa DAC1984 (left) and A05 (right) in PD3 broth in petri dishes. (B) Quantitative assessment of cell-to-cell aggregation of X. fastidiosa A05 or DAC1984 by an OD assay as described previously (3, 29). Three replicates were used in each experiment. For each assay time, different letters indicate significant differences (Student's t test; P < 0.05) between the wild type and the mutant.