Hexose-H(+) symporter that catalyzes the high-affinity uptake of glucose, galactose and mannose (PubMed:26893494). Proton-coupled symporter responsible for the uptake of glucose from the apoplast into the cells (Probable). D-glucose(out) + H(+)(out) = D-glucose(in) + H(+)(in) D-mannose(out) + H(+)(out) = D-mannose(in) + H(+)(in) D-galactose(in) + H(+)(in) = D-galactose(out) + H(+)(out) Localizes to the plasma membrane. Expressed in primordia of lateral roots, pollinated stigmata, and pollen tubes. Induced under low-glucose conditions in pollen tubes (PubMed:26893494). Down-regulated by glucose (PubMed:26893494). No visible phenotype under normal growth conditions. Belongs to the major facilitator superfamily. Sugar transporter (TC 2.A.1.1) family.