Transcription activator involved in heat and endoplasmic reticulum (ER) stress responses (PubMed:31733092). Regulates the expression of genes involved in ER protein folding and heat stress-responsive genes (PubMed:31733092). Binds directly to the promoter of BZIP74 and regulates its expression in response to heat stress (PubMed:31733092). NTL3 relocates from plasma membrane to nucleus in response to heat and endoplasmic reticulum (ER) stresses. Widely expressed. Induced by salt stress (PubMed:18813954, PubMed:31733092). Induced by cold stress (PubMed:18813954). Induced by dithiothreitol- and tunicamycin-induced endoplasmic reticulum (ER) stress response (PubMed:31733092). Induced by heat shock (PubMed:31733092). The NAC domain includes a DNA binding domain and a dimerization domain. No visible phenotype under normal growth conditions, but mutant plants exhibit hypersensitivity to heat stress.