Probable transcription factor. Required for female gametophyte development. Expressed in the funiculus of ovules and in embryos. In young ovules, expression is observed in the adaxial side of the funiculus (the stalk connecting the embryo sac to the placenta). Also expressed in heart-stage embryos, in the cortex and endodermis of the hypocotyl region but not in the cotyledons, shoot and root apical meristems, provasculature or epidermis. Not detected in young seedlings, mature roots or in young floral primordia. Endosperm development arrested. Assigned as a member of the MYB-related gene family, I-box-binding-like subfamily.