Mediates active uptake of hexoses by sugar:proton symport (By similarity). May play an important role in transporting monosaccharides during anther development (Probable). Expressed specifically in anthers. Repressed by cold (PubMed:16730464, PubMed:17693452). Repressed by abscisic acid (ABA) (PubMed:17693452). Belongs to the major facilitator superfamily. Sugar transporter (TC 2.A.1.1) family.