PHO1 — Hordeum vulgare subsp. vulgare

Summary

HORVU.MOREX.R3.7HG0676420 (HvPHO1) on barley chromosome 7H encodes a protein containing SPX and EXS domains, with annotated molecular functions including phosphate transmembrane transporter activity, inositol hexakisphosphate binding, and ubiquitin-protein transferase activity. The gene is associated with phosphate homeostasis, transport, and starvation responses, as well as regulation of seed and endosperm development, seed size, starch metabolism, and red/far-red light signaling. It has been linked to phosphorus uptake, leaf senescence, flowering time, low-temperature stress response, and reproductive period. Localization evidence connects the protein to the plasma membrane, endomembrane system, nucleus, and cytosol. Related genes in other species are linked to root-to-shoot phosphate transfer, xylem loading, shoot phosphorus content, and grain weight.