Possibly has a role in RNA transcription or processing during stress (By similarity). Binds sequence non-specifically to RNAs and DNAs (By similarity). Mediates cell-to-cell trafficking of RNA interference (RNAi) signals (small RNAs (sRNA), e.g. small interfering RNA (siRNA) and microRNA (miRNA)) which regulate growth and development, as well as responses to environmental inputs, including pathogen attack; can compromise zucchini yellow mosaic virus (ZYMV) and tobacco rattle virus (TRV) infections at the early stage (PubMed:31812689). Binds to small phloem-mobile single-stranded RNAs (ss-sRNA, e.g. small interfering RNA (siRNA) and microRNA (miRNA)) in the phloeme exudate, including viral-derived sRNA (vsiRNA). Observed in the phloem translocation stream. Accumulates in phloem exudates. The glycine-rich (GR) domain is necessary and sufficient for cell-to-cell movement and to interefere with zucchini yellow mosaic virus (ZYMV) infection. Belongs to the GR-RBP family.