Catalase, a decomposer of H2O2, or NO scavenger CPTIO and NO synthase inhibitor L-NNA had no effects on the kinase activation (Figure 2E), implying that the CPK activation likely occurs upstream or independently of ROS and NO signaling, which are induced upon Pst avrRpm1 or avrRpt2 infection in Arabidopsis leaves [24], [26], [42]. This evidence concerns the gene CAT and infection.