Since a functional HPL leads to higher susceptibility and higher JA levels upon DC3000 infection and E-2-hexenal pre-treatment increased susceptibility of Arabidopsis to DC3000 we sought to elucidate part of the signaling pathways involved, by testing if Arabidopsis mutants in the JA-signaling pathway were still more susceptible to DC3000 after treatment with E-2-hexenal. This evidence concerns the gene LGALS1 and infection.