The JA-responsive gene LOX9 was not up-regulated upon infection with the different Np strains, while the expression of the JA/ET-responsive gene PR3 encoding a chitinase was increased by 2.5-fold upon Np-Bt67 or Np-B infection, and by 1.6-fold upon NpB-UV9 infection (Figure 4). Here, PRTN3 is linked to infection.