Figure 4.

mkp1(Col) Has Increased Resistance to P. syringae Infection and Constitutively Accumulates Elevated Levels of Camalexin.

(A) Bioluminescence representing bacterial growth on rosettes and detached leaves 1 and 4 d, respectively, after spray inoculation with P. syringae pv tomato DC3000 strain carrying the luxCDABE operon. Color scale bars are shown; arrows indicate increasing photon intensity. Cold colors (e.g., blue and green) represent regions of lower photon counts, and warm colors (e.g., yellow and red) represent regions of more intense luminescence.

(B) Leaf bacteria as determined by serial dilution plating 4 days postinoculation. The means ± se (n = 10) are shown. The difference between Col and mkp1(Col) is statistically significant (Student's t test, P < 0.001). Representative data of three independent biological repetitions are shown in (A) and (B).

(C) Bioluminescence representing bacterial growth on plants 3 d after spray inoculation with Pst DC3000 lux. Representative data of two independent repetitions is shown.

(D) Camalexin levels in 22-d-old plants. The average level of three independent samples is shown. Error bars represent sd.