Transcription factor that binds specifically to a 5'-AA[AG]G-3' consensus core sequence (By similarity). Promotes expression (PubMed:19915089). The PEAR proteins (e.g. DOF2.4, DOF5.1, DOF3.2, DOF1.1, DOF5.6 and DOF5.3) activate gene expression that promotes radial growth of protophloem sieve elements (PubMed:30626969). Involved in the regulation of interfascicular cambium formation and vascular tissue development, particularly at a very early stage during inflorescence stem development; promotes both cambium activity and phloem specification, but prevents xylem specification (PubMed:19915089). The PEAR proteins (e.g. DOF2.4, DOF5.1, DOF3.2, DOF1.1, DOF5.6 and DOF5.3) form a short-range concentration gradient that peaks at protophloem sieve elements (PSE) (PubMed:30626969). Preferentially expressed in the vasculature of all organs, including seedlings, roots, stems, buds, leaves, flowers and siliques, and particularly in the cambium, phloem and interfascicular parenchyma cells of inflorescence stems (PubMed:19915089). Expressed in the vascular tissues and pericycle of primary roots. Detected in the vasculature of the cotyledons, rosette leaves and cauline leaves. In flowers, localized in vasculature of petals, stigma, and stamen filaments, and, to a lower extent, in anthers and carpels. In inflorescence stems, accumulates in the vasculature, particularly in cambium, phloem, and interfascicular parenchyma cells. Disruption of interfascicular cambium formation and development in inflorescence stems.