LOX and infection: To examine effects of mycorrhizal colonization on defense responses in host plants in presence of pathogen infection tomato plants were subjected to four treatments: (1) CK: control without fungal inoculation; (2) As: inoculation with A. solani; (3) Fm: inoculation with F. mosseae; (4) Fm+As: inoculation with both F. mosseae and A. solani. Four defense-related enzymes, including PAL, LOX, chitinase, and β-1,3-glucanase were analyzed in the leaves of tomato plants.