Figure 1. SA-independent regulation of PR1 during ETI.

(A) The PR1 expression level in leaves at 6 or 24 hpi with Pto strains (OD₆₀₀ = 0.001) or mock was determined by qRT-PCR. Bars represent means and standard errors of two biological replicates calculated using a mixed linear model. The vertical axis shows the log₂ expression level relative to Actin2 (At2g18780). (B) The free SA levels in leaf samples corresponding to those in (A) were determined. Bars represent means and standard errors of two biological replicates calculated using a mixed linear model. The SA level is shown on a log₁₀ scale. Asterisks indicate significant differences from mock (P<0.01, two-tailed t-tests).