Secreted effector required for full virulence of U.virens (PubMed:31105658). Inhibits host pathogen-associated molecular pattern-triggered immunity including flg22- and chitin-induced defense gene expression and oxidative burst (PubMed:31105658). Localizes in periplasmic spaces and perhaps in multiple subcellular compartments of plant cells. Expression is up-regulated during U.virens plant infection. The Plant immunity suppression domain is sufficient to retain the ability to suppress immunity-associated responses. Greatly attenuates U.virens virulence to rice.