We measured JA, ABA, SA and COR in wild‐type A. thaliana (Col‐5) and the JA receptor mutant coi1‐16 (cleared of the pen2 mutation; Westphal et al., 2008), which is compromised in most jasmonate responses (Turner et al., 2002), following infection with either P. syringae DC3000 or strain DC3000∆cfa6:∆cmaA, which is deficient in the production of both COR precursors, CFA and CMA (Brooks et al., 2004). Here, PSENEN is linked to infection.