For both simple and compound leaves, a MYB domain transcription factor PHANTASTICA (PHAN) plays an important role in establishing the adaxial domain in the leaf. Zoulias et al. generate and analyse transgenic tomato plants expressing tomato PHAN (SlPHAN) and tobacco plants that over-express tomato SlPHAN. Modulations in SlPHAN resulted in a variety of leaf morphologies, and the results suggest that SlPHAN plays a role in medio-lateral extension of the adaxial domain and contributes to final leaf morphology in tomato.
