Expression profile of AtPNP-A and selected correlated genes in selected A. thaliana mutants. The expression profiles of AtPNP-A and the correlated genes were examined in a number of SA/SAR related mutants. The expression of AtPNP-A and selected genes is greatly elevated in WRKY 70 over-expresser lines and in mutants with elevated SA levels such as cpr5 and mpk4. Conversely, in the SA deficient mutant nahG, expression of the selected genes is markedly reduced. Error bars represent standard errors of the mean.