T. harzianum induced priming, defense-related enzymatic activity (PAL, POX, PPO), as well as antioxidant enzymatic activity (SOD, catalase (CAT), and others) in chili pepper plants upon infection with C. truncatum, also diminishing the symptoms caused by the pathogen and ROS induced accumulation, protecting the plant against its pathogen [112]. This evidence concerns the gene PPOX and infection.