CAT and infection: The reactive oxygen scavenging system of pathogens, including antioxidant enzymes such as superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), glutathione peroxidase (GPX), and glutathione reductase (GR), is activated during infection to reduce excess ROS in pathogen intracellular and plant tissues, ultimately preventing oxidative damage to cells [19].