PRPF6 and bacterial infectious disease: The expression of the SA-defence marker genes, pathogenesis-related protein 6 (PR-P6) (Figure 5g) and pathogenesis-related protein 1a (PR-1a) (Figure 5h), was not significantly higher in DeLier-1-infested leaflets than in non-infested controls, irrespective of the bacterial infection-status of the mites.