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) (PubMed:21961049). Induced by biotic elicitors (e.g. fungal chitin oligosaccharide) (PubMed:23462973). 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) (PubMed:17601827). The WRKY domain is required to bind DNA. Belongs to the WRKY group II-a family.