Fig. 1From: The Function of Rac Small GTPase and Associated Proteins in Rice Innate ImmunityModel of plant innate immunity. PRRs are the first layer of defense against pathogen infection at the cell surface. PRRs recognize PAMPs and then trigger PTI. R proteins act as intracellular receptors for the direct or indirect recognition of specific pathogen effectors (also called avirulence (Avr) proteins) and induce ETI.Back to article page