Figure 1.
A Model for the Differential Regulation of Signal Pathway Genes and Defensive Genes in Leaves of Tomato Plants in Response to Wounding and Systemin.
In this model, JA activates the signal pathway genes (early genes) in the vascular bundles, whereas H2O2, produced by cell wall–derived oligogalacturonides released by PG is a second messenger that activates defense genes (late genes) in mesophyll cells. DPI, diphenyl iodinium chloride; PG, polygalacturonase; PIs, proteinase inhibitors; PM, plasma membrane; PPO, polyphenol oxidase; R, receptor.