Extracellular signal peptide that regulates cell fate (PubMed:16407446). Represses root apical meristem maintenance (PubMed:16902140). Positively regulates the expression of the transcription factor WOX8 and thus, regulates early embryo development (PubMed:22427333). Regulates the transition of protophloem cells from proliferation to differentiation, thus impinging on postembryonic growth capacity of the root meristem; this signaling pathway requires CRN and CLV2 (PubMed:28607033). Mostly expressed in siliques, and, to a lower extent, in flowers (PubMed:12602871). Expressed in young embryos and endosperm (PubMed:22427333). The O-glycosylation (arabinosylation) of the hydroxyproline Pro-67 enhances binding affinity of the CLE8p peptide for its receptor. Belongs to the CLV3/ESR signal peptide family. Extended C-terminus.