Transcription factor involved in the expression of defense genes in innate immune response of plants. Interacts specifically with the W box (5'-(T)TGAC[CT]-3'), a frequently occurring elicitor-responsive cis-acting element. Activates WRKY 29, SIRK and its own promoters. Induced after flagellin treatment. Acts downstream a MAPK cascade and therefore might be regulated by phosphorylation. WRKY 22 and WRKY 29 may provide redundant functions. Belongs to the WRKY group II-e family.