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', in the promoter of target genes (By similarity). Involved in xylem formation by promoting the expression of secondary wall-associated transcription factors and of genes involved in secondary wall biosynthesis and programmed cell death, genes driven by the secondary wall NAC binding element (SNBE). Triggers thickening of secondary walls (PubMed:25148240). Interacts with NAC030/VND7. Expressed in root metaxylem pole and in shoot pre-procambium and procambium (PubMed:18445131). Present in root developing xylems (PubMed:16103214). Specifically expressed in vessels but not in interfascicular fibers in stems (PubMed:25148240). Up-regulated during xylem vessel element formation. Expressed preferentially in procambial cells adjacent to root meristem. Induced by chitin (e.g. chitooctaose) (PubMed:17722694). Accumulates in plants exposed to callus induction medium (CIM) (PubMed:17581762). The NAC domain includes a DNA binding domain and a dimerization domain. Belongs to the plant vascular related NAC-domain protein family.