Mediates active uptake of hexoses by sugar:proton symport (Probable). Can transport glucose, fructose, mannose and galactose (PubMed:17874189, PubMed:18506478). Can transport xylose and ribose (PubMed:18506478). Expressed in roots, shoots, leaf blades, leaf sheaths, anthers, ovaries and embryos. Induced by glucose, sucrose and salt stress. Belongs to the major facilitator superfamily. Sugar transporter (TC 2.A.1.1) family.