Transcriptional repressor that negatively regulates the expression of genes involved in xylem vessel formation. Represses the transcriptional activation activity of NAC030/VND7, which regulates protoxylem vessel differentiation by promoting immature xylem vessel-specific genes expression (PubMed:20388856). Transcriptional activator that regulates the COLD-REGULATED (COR15A and COR15B) and RESPONSIVE TO DEHYDRATION (LTI78/RD29A and LTI65/RD29B) genes by binding directly to their promoters. Mediates signaling crosstalk between salt stress response and leaf aging process (PubMed:21673078). May play a role in DNA replication of mungbean yellow mosaic virus (PubMed:24442717). Interacts with NAC007/VND4, NAC026/VND5 and NAC030/VND7 (PubMed:20388856). Interacts with the mungbean yellow mosaic virus (MYMV) AC1 replication-associated protein (PubMed:24442717). Expressed in xylem and phloem cells in roots and inflorescence stems (PubMed:20388856). Highly expressed in senescent leaves. Expressed in roots, and abscission and dehiscence tissues, such as axils of bracts and abscission zones in cauline leaves and siliques (PubMed:21673078). Up-regulated during xylem vessel element differentiation. By abscisic acid (ABA) and salt stress. The NAC domain includes a DNA binding domain and a dimerization domain. Accelerated leaf aging. Over-expression of NAC083 inhibits protoxylem vessel formation in roots.