Pathogenicity of and plant immunity to soft rot pectobacteria

摘要: Soft rot Pectobacteria are broad host range enterobacterial pathogens that cause disease on a variety of plant species including the major crop potato. aggressive necrotrophs harbor large arsenal cell wall degrading enzymes as their primary virulence determinants. These together with additional factors employed to macerate tissue and promote death provide nutrients for pathogens. In contrast (hemi)biotrophs such Pseudomonas, type three secretion systems (T3SS) T3 effectors do not appear central pathogenesis Pectobacteria. Indeed, recent genomic analysis several Pectobacterium emerging pathogen wasabiae has shown many strains lack entire T3SS well effectors. Instead, this indicated presence novel Resistance is complex does involve single resistance genes. activation innate immunity both SA JA/ET mediated defenses appears play role in attenuation virulence. triggered by detection pathogen-associated molecular patterns (PAMPs) or recognition modified-self damage-associated (DAMPs) result enhancement basal (Pattern-triggered immunity, PTI). particular cell-wall fragments released action degradative secreted players enhanced towards these Most notably bacterial pectin release oligogalacturonide (OG) recognized DAMPs activating immune responses. Recent progress understanding OG signaling allows genetic screens OG-insensitive mutants will new insights into defense strategies against