Probable transcription factor (By similarity). Involved, together with PDF2, in the regulation of flower organs development by promoting the expression of APETALA 3 (AP3) in the epidermis and internal cell layers of developing flowers (PubMed:23590515). Interacts with AIL7/PLT7, ANT, BBM and AIL1. A number of isoforms are produced. According to EST sequences. Expressed in hairless cell files of the hypocotyl epidermis. Expressed in shoot apical meristem (SAM) with higher levels in L1 cells and the epidermal layer of young leaves (PubMed:16778018). Expressed in primary root tips, in the L1 of apical inflorescence meristems, early flower primordia, carpel epidermis, ovule primordia, nucellus, chalaze and seed coat (PubMed:16778018). The double mutant pdf2-1 hdg2-3 exhibits abnormal flowers with sepaloid petals and carpelloid stamens in association with a reduced expression of APETALA 3 (AP3) in the epidermis and internal cell layers of developing flowers. Belongs to the HD-ZIP homeobox family. Class IV subfamily.