Transcription factor. Isoform MYB48-2 and isoform MYB48-3 (harboring both NLS1 and NLS2) are nuclear, werheas isoform MYB48-1 (harboring NLS2) and isoform MYB48-4 (harboring NLS1) are partially nuclear. Mainly expressed in leaves and seedlings, and to a lower extent, in roots, stems and inflorescences. Isoform MYB48-1, isoform MYB48-3 and isoform MYB48-4 are present in all of these organs, but isoform MYB48-2 is confined to leaves. By salicylic acid (SA).