Effectors, kind of secreted proteins, are widely existed in bacteria, oomycetes and fungi, which plays an important role in the interaction between pathogenic microorganisms and their hosts. Effectors are classified into avirulence effectors(Avr) and virulence effectors(Vir) according to whether pathogen can compatibly interact with its host or not. This paper introduced the efforts in the typical pathogenic bacteria Pseudomonas syringae and the R genes in host plants, and described the interaction mechanism between Avr genes and R genes, including direct recognition and indirect recognition. ...
