SUT1 — Oryza sativa Japonica

Summary

OsSUT1 (OS03G0170900) on rice chromosome 3 encodes a sucrose:proton symporter belonging to the sucrose symporter plant family and the major facilitator superfamily, with molecular functions including sucrose:proton symporter activity, maltose:proton symporter activity, and salicin transmembrane transporter activity. The gene is associated with phloem loading and unloading, sucrose transport, maltose transport, starch metabolism, grain filling, endosperm development, pollen maturation and germination, shoot regeneration, and organogenesis. It has been linked to salt tolerance, temperature response, seed and grain traits including grain yield, grain weight, floury endosperm, and harvest index, as well as photosynthetic ability, leaf chlorosis, vegetative growth, and root development. The protein localises to the plasma membrane, tonoplast, vacuole, and cis-Golgi network. Studies of related genes in other species link the family to grain protein content and drought tolerance.