Signaling peptide (root growth factor) required during root gravitropism in a PIN2-traffic dependent manner, thus influencing the formation of auxin gradients (PubMed:22421050, PubMed:23370719). Maintains the postembryonic root stem cell niche (PubMed:20798316). Binds to LRR receptor-like serine/threonine-protein kinases RGI1, RGI2 and RGI3 to trigger their dimerization with SERK proteins and subsequent signaling. A number of isoforms are produced. According to EST sequences. Expressed in roots, specifically in the root apical meristem (RAM). In roots, restricted to the root apical meristem (RAM) in a pattern positioned just above the quiescent center (QC), mainly in endodermis, cortex and vascular tissues, with strongest levels within cells in the QC vicinity (PubMed:23370719, PubMed:22421050). Slightly observed in the epidermis (PubMed:23370719). Induced early during lateral root formation (PubMed:23370719). Dose-dependent altered root gravitropism associated with an altered PIN2 traffic that impairs the formation of auxin gradients, thus leading to an irregular waves root shape. 'Golven' means irregular waves in Dutch. Belongs to the RGF family.