Decreased abundance of type III secretion system-inducing signals in Arabidopsis mkp1 enhances resistance against Pseudomonas syringae

摘要: Genes encoding the virulence-promoting type III secretion system (T3SS) in phytopathogenic bacteria are induced at start of infection, indicating that recognition signals from host plant initiates this response. However, precise nature these and whether their concentrations can be altered to affect biological outcome host–pathogen interactions remain speculative. Here we use a metabolomic comparison resistant susceptible genotypes identify plant-derived metabolites induce T3SS genes Pseudomonas syringae pv tomato DC3000 report mapk phosphatase 1 (mkp1), an Arabidopsis mutant is more bacterial produces decreased levels bioactive compounds. Consistent with observations, effector expression delivery by was impaired when infecting mkp1 mutant. The addition fully restored suppressed enhanced resistance Pretreatment plants pathogen-associated molecular patterns (PAMPs) PAMP-triggered immunity (PTI) also restricts enhances unknown mechanisms, similarly both aspects PTI. Together, results demonstrate perceives multiple derived initiate its level host-derived impacts pathogenesis.