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). Regulates negatively basal innate immunity and XA21-mediated defense against X.oryzae pv. oryzae (Xoo) (By similarity). Interacts with XA21 in the nucleus. Might be activated by XA21 in the nucleus upon pathogen infection (PubMed:20118235). 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)). Accumulates after treatment with benzothiadiazole (BTH) and salicylic acid (SA) (PubMed:16528562). Transactivated by WRKY45 (By similarity). The WRKY domain is required to bind DNA. Belongs to the WRKY group II-a family.