Mediates active uptake of hexoses by sugar:proton symport. Can transport glucose, xylose and 3-O-methylglucose (PubMed:12723603). May play a role at the early stage of seed development (Ref.5). Expressed in panicles before heading (PubMed:12723603). Expressed in flowers before pollination (Ref.5). Belongs to the major facilitator superfamily. Sugar transporter (TC 2.A.1.1) family.