Signaling peptide (root growth factor) required during root gravitropism in a PIN2-traffic dependent manner (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 (PubMed:23370719). Binds to LRR receptor-like serine/threonine-protein kinases to trigger their dimerization with SERK proteins and subsequent signaling. Expressed in roots. In roots, restricted to the root apical meristem (RAM) in a pattern positioned just above the quiescent center (QC); strongest levels are observed in the meristematic cortical cells, but also detected in the epidermis and within the vasculature (PubMed:23370719). Induced during lateral root formation after the emergence of the primordium (PubMed:23370719). 'Golven' means irregular waves in Dutch. Belongs to the RGF family.