Transcription regulator; part of the Fg3_54/C64 gene cluster that mediates the biosynthesis of the octapeptide fusaoctaxin A, a virulence factor that is required for cell-to-cell invasiveness of plant host (PubMed:30804501). Positively regulates the expression the Fg3_54/C64 gene cluster (PubMed:30804501). Expression is induced during infection of coleoptiles of wheat seedlings (PubMed:23266949, PubMed:25333987). The fusaoctaxin A gene cluster is silenced by H3K27 trimethylation by the histone methyltransferase KMT6 (PubMed:31100892). Produces significantly smaller lesions and fewer spikelets with blight symptoms on susceptible wheat cultivars.