Defense-related gene expression in response to P. syringae. Wild-type Col-0 and nata1 were infiltrated with P. syringae DC3000. Expression of PR1 (A), PR2 (B), PR3 (C), PR4 (D), PR5 (E), and PR6 (F) measured by quantitative PCR. Mean ± se of n = 9. *P < 0.05, two-tailed t test comparing Col-0 wild type and nata1 at the same time point.