Transcription activator that binds to the secondary wall NAC binding element (SNBE), 5'-(T/A)NN(C/T)(T/C/G)TNNNNNNNA(A/C)GN(A/C/T)(A/T)-3', and to the tracheary elements (TE) specific regulating cis-element (TERE), 5'-CTTNAAAGCNA-3', in the promoter of target genes (e.g. genes involved in secondary wall biosynthesis, cell wall modification such as xylan accumulation, and programmed cell death). Involved in xylem formation in roots and shoots, especially regulating metaxylem vessel differentiation by promoting immature xylem vessel-specific genes expression, especially genes regulating programmed cell death (PCD) and secondary wall formation in tracheary elements (TE). Can activate MYB25, MYB46, MYB58, MYB63, MYB83, MYB103, CESA4, LBD15, LBD30, ERF115, XCP1, XCP2, NAC010/SND3, KNAT7, ASL19 and ASL20 expression.
