FIG. 4.

In planta bacterial growth of P. syringae pv. tomato DC3000 and the pchA mutant. Bacterial growth in planta is shown for infection of susceptible plant hosts: tomato (A), Arabidopsis thaliana (B), and the Arabidopsis ics1 mutant, which has a defect in the synthesis of pathogen-induced SA (C). Mature leaves of these plants were infiltrated with P. syringae pv. tomato DC3000 (black) or the pchA mutant (gray) at a dose of 5 × 10⁵ CFU/ml. In planta bacterial growth was assessed at 0, 1, and 3 dpi.