Transcription factor that confers sensitivity to abscisic acid (ABA) and salt, but tolerance to drought (PubMed:21399993). Regulates secondary cell wall (SCW) biosynthesis, especially in interfascicular and xylary fibers (PubMed:18952777, PubMed:23781226). Expressed in stamen (PubMed:19325888). Present in roots and siliques, and, at low levels, in leaves and flowers (PubMed:21399993). Expressed in stems, especially in fibers and, at lower levels, in xylems (PubMed:18952777, PubMed:21399993). By abscisic acid (PubMed:16463103, PubMed:21399993). Accumulates in response to salt (PubMed:21399993). Triggered by MYB46 and MYB83 in the regulation of secondary cell wall biosynthesis (PubMed:19674407, PubMed:22197883). Secondary cell wall (SCW) defects including severe reduction in SCW thickening in both interfascicular fibers and xylary fibers of inflorescence stems (PubMed:18952777). Hyperlignified SCW in interfascicular fibers and xylary fibers (PubMed:23781226). Has been reported as both positive and negative regulator of secondary cell wall (SCW) biosynthesis by contradictory mutants phenotypes. Truncated N-terminus.