Signaling peptide (root growth factor) that maintains the postembryonic root stem cell niche (PubMed:20798316, PubMed:23370719). 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 RGI1, RGI2 and RGI3 to trigger their dimerization with SERK proteins and subsequent signaling. Expressed in root tips (PubMed:20798316, PubMed:22307643, PubMed:23370719). Also present in siliques (PubMed:22307643). In roots, expressed only in the quiescent center (QC), the columella stem cells (CC) and the innermost layer of central columella cells; mostly present in the third and fourth CC layers, but not, or only marginally, in the QC (PubMed:20798316, PubMed:22307643, PubMed:23370719). Induced during lateral root formation (PubMed:23370719). Accumulates in pollen grains (PubMed:23370719). No visible phenotype, due to the redundancy with other RGF genes. Triple mutant rgf1-rgf2-rgf3 shows a decreased meristematic cell number resulting in a short root phenotype. 'Golven' means irregular waves in Dutch. Belongs to the RGF family.