Figure 6.
Effect of SA, INA and their analogs on myb1 gene expression. (A) Rapid activation of myb1 by SA (1 mM) preceded induction of PR-1. Time is indicated in h postinjection of SA (or H2O as a control) into tobacco leaves. (B) Induction of myb1 by SA, INA, and their biologically active analogs (acetylSA, 4-chloroSA, analogs 3 and 7). Inactive analogs [3- and 4-hydroxybenzoic acid (HBA), analogs 1 and 9] were poor inducers. Expression of myb1 was analyzed 30 min after injection with 1 mM of the various compounds. The chemical structures of the INA analogs were presented in a previous report (25).