Probable transcription factor involved in the regulation of the tissue-specific accumulation of anthocyanins and in cellular organization of the primary root. Interacts with AIL7/PLT7, ANT, BBM and AIL1. A number of isoforms are produced. According to EST sequences. Expressed in roots, stems, leaves and floral buds. Plants display a strong reduction of anthocyanin content on the adaxial side of rosette leaves, a slight reduction onf the abaxial side, and extra cells between cortical and epidermal layers in roots. Belongs to the HD-ZIP homeobox family. Class IV subfamily. Truncated N-terminus.