Transcription repressor. Interacts specifically with the W box (5'-(T)TGAC[CT]-3'), a frequently occurring elicitor-responsive cis-acting element. Regulates, probably indirectly, the activation of defense-related genes during defense response (By similarity). Modulates plant innate immunity against X.oryzae pv. oryzae (Xoo) (By similarity). Induced by biotic elicitors (e.g. fungal chitin oligosaccharide) (By similarity). Induced by pathogen infection (e.g. M.grisea and X.oryzae pv. oryzae (Xoo)) (PubMed:16528562). Accumulates after treatment with benzothiadiazole (BTH) and salicylic acid (SA) (By similarity). The WRKY domain is required to bind DNA. Belongs to the WRKY group II-a family.