Figure 1.

Expression of acidic PR proteins in Cat-deficient tobacco and SA requirement for induction. Cat1AS and control plants precultivated at LL were exposed to HL for 2 days. (A) Western blot analysis showing high expression of acidic PR proteins in Cat1AS plants exposed to HL. Cat1AS × Xnc is a cross of homozygous Cat1AS and Xanthi nc lines, whereas Cat1AS × NahG is a cross of homozygous Cat1AS and a transgenic Xanthi nc line containing the NahG gene of Pseudomonas putida, which codes for an SA hydroxylase (9). (B) Time course analysis of SA and SA β-glucoside (SAG) accumulation in Cat1AS plants after HL induction. FW, fresh weight.