CAT and infection: The reactive oxygen scavenging system of the pathogen, including antioxidant enzymes such as superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), glutathione peroxidase (GPX), and glutathione reductase (GR), which are activated during the infection process to reduce the excess ROS produced in pathogens intracellularly and in plant tissues, ultimately prevent oxidative damage to cells [27].