A possible explanation for the mechanism by which Trichoderma spp mediates resistance in response to F. oxysporum and B. cinerea is through JA involvement, since this hormone controls fungi proliferation, up-regulates the expression of defense genes, induces the activities of catalase and ascorbate peroxidase and shows minimal lipid peroxidation and cell death after a challenge infection with these pathogens. Here, CAT is linked to infection.