Figure 1b illustrates Fv/Fm images at 18 hpi showing pretreated leaves (flg, elf, chi) have healthy Fv/Fm responses (red/orange false‐coloured leaves), whereas reduced Fv/Fm due to DC3000 infection following H2O (mock) pretreatment is indicated by their distinctive green/blue false colouration. Here, FLG is linked to infection.