In HCPro-OX, cat1-KO, and cat1cat3-KO leaves, NADPH oxidase activity and H2O2 content were significantly higher than in CAT3-OX or cat3-KO under ChiVMV infection, while these increases were largely alleviated in CAT1-OX leaves (Fig. 6B, D). This evidence concerns the gene SLC7A3 and infection.