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. Detected in root protoxylem and metaxylem poles and in vessels of protoxylems, outermost metaxylems, inner metaxylems, shoots and hypocotyls (PubMed:18445131). Expressed in roots, hypocotyls, cotyledons and leaves. Present in developing xylems (PubMed:16103214, PubMed:16581911). 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. The NAC domain includes a DNA binding domain and a dimerization domain. Belongs to the plant vascular related NAC-domain protein family.