Figure 5.

Genetic model for the role of jasmonate synthesis and signaling in the systemic activation of wound-responsive PI genes in tomato plants. Wounding or expression of 35S∷prosys leads to the production of a long-distance signal that activates PI gene expression in distal leaves (i.e., scion). A functional octadecanoid pathway for jasmonate biosynthesis (hatched line), which is disrupted by def-1 and spr-2, is required for the production of the long-distance signal (X). Jasmonate signaling, which is blocked by jai-1, is required for the recognition of the long-distance signal.