Transcription factor. Interacts specifically with the W box (5'-(T)TGAC[CT]-3'), a frequently occurring elicitor-responsive cis-acting element. May act also as a disease resistance protein with a serine/threonine-protein kinase activity (By similarity). A number of isoforms are produced. According to EST sequences. Belongs to the disease resistance X-TIR-NB-LRR-X family. Functional and comparative genomics of disease resistance gene homologs