Bacillus velezensis XT1 metabolized surfactin to inhibit the infection of Botrytis cinerea in tomatoes (Toral et al., 2018) and strain TP-1 enhanced grape resistance to gray mold by inducing the activities of plant defense enzymes PAL, PPO, and POD in grapes (Zou et al., 2023). The gene discussed is PPOX; the disease is infection.