When PstDC3000, a biotrophic pathogen, infects Arabidopsis, the intracellular receptor kinase, RIPK, recognizes the lipopolysaccharide of PstDC3000 and phosphorylated NADPH oxidase RBOHD to induce oxidative burst, which initiates plant defense signal transmission, strengthens the cell wall, causes an allergic reaction, and leads to programmed cell death, thereby inhibiting the infection of pathogenic bacteria [39,40]. The gene discussed is FMO5; the disease is infection.