Mediates an active uptake of hexoses, probably by sugar/hydrogen symport. Can transport glucose, 3-O-methylglucose, xylose, mannose, fructose and galactose. Pollen specific (at protein level). Specifically expressed in pollen grains when the callose of microspores tetrads undergoes degradation, between early tetrad and late trinucleate stages (at protein level). Belongs to the major facilitator superfamily. Sugar transporter (TC 2.A.1.1) family. Sequencing errors.