Infection with A2-O induced the expression of genes encoding phenylalanine ammonia-lyase (PAL), cinnamate 4-hydroxylase (C4H), 4-coumaroyl-CoA ligase (4CL), p-hydroxycinnamoyl-CoA:shikimate p-hydroxycinnamoyl transferase (HCT), caffeoyl-CoA O-methyltransferase (CCoAOMT), cinnamoyl-CoA reductase (CCR), F5H, caffeic acid O-methyltransferase (COMT), and cinnamyl alcohol dehydrogenase (CAD). Here, COMT is linked to infection.