Proteoglycan that seems to be implicated in diverse developmental roles such as differentiation, cell-cell recognition, embryogenesis and programmed cell death. Expressed in reproductive tissues. Expressed in chalaza, funiculus, stigma, septum, style, integument and transmitting tract. Contains 4-hydroxyproline; hydroxylated on Pro-27, Pro-29 and Pro-31. O-glycosylated on hydroxyprolines; noncontiguous hydroxylproline residues are glycosylated with arabinogalactan. Belongs to the AG-peptide AGP family.