Signaling peptide (root growth factor) that promotes root hairs formation and growth (PubMed:23370719). Maintains the postembryonic root stem cell niche (PubMed:20798316). Regulates the pattern of root growth and lateral root development by modulating the length and the number of cortical cells in the root apical meristem (RAM), and the anticlinal asymmetric cell divisions in lateral root initiation cells (By similarity). Binds to LRR receptor-like serine/threonine-protein kinases to trigger their dimerization with SERK proteins and subsequent signaling. Expressed in roots and sepals. In roots, present in the root portion above the meristem, mainly in the root elongation zone and the proximal region of the differentiation zone; restricted to the epidermis (PubMed:23370719). Induced during lateral root formation in mature lateral roots (PubMed:23370719). Shorter root hairs. 'Golven' means irregular waves in Dutch. Belongs to the RGF family.