MMP11 and infection: The expression of SlPR1a and SlPR1b in the pTRV2-Sl3-MMP- and pTRV2-GUS-infiltrated plants was significantly upregulated after infection of B. cinerea, but the levels in pTRV2-Sl3-MMP-infiltrated plants showed 7-8 folds higher than those in the pTRV2-GUS-infiltrated plants (Fig. 8b).