SUT1 — Hordeum vulgare subsp. vulgare

Summary

HORVU.MOREX.R3.4HG0403620 (SUT1, HvSUT1) on barley chromosome 4H encodes a protein belonging to the sucrose symporter plant family and the major facilitator superfamily. The protein exhibits sucrose:proton symporter activity, as well as maltose:proton symporter, arbutin, and salicin transmembrane transporter activities. It is associated with phloem transport and unloading, sucrose and maltose transport, starch and sucrose metabolism, protein synthesis, amino acid anabolism, pollen germination, and NO storage. The gene is linked to grain filling period, photosynthetic rate, protein content, grain yield, and xylem and grain phenotypes. The protein localises to the plasma membrane, tonoplast, vacuole, membrane, and cis-Golgi network. Studies of related genes in other species connect the family to grain weight, size, and protein content, starch content, heat and drought tolerance, salt response, photosynthetic ability, and stay green and floury endosperm traits.