Signaling peptide (root growth factor) that 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 (PubMed:22307643, PubMed:23370719). Binds to LRR receptor-like serine/threonine-protein kinases RGI1, RGI2 and RGI3 to trigger their dimerization with SERK proteins and subsequent signaling. The precursor is detected in the endoplasmic reticulum probably during its processing. Expressed in roots, shoots, leaves and flowers. In roots, expressed only in the quiescent center (QC) and the columella stem cells (CC) initials (PubMed:23370719). Slightly observed in additional underlying CCs and in the vascular initials above the QC (PubMed:23370719). Induced early during lateral root formation (PubMed:23370719). 'Golven' means irregular waves in Dutch. Belongs to the RGF family.