Mediates both low-affinity uptake and efflux of sugar across the plasma membrane (By similarity). Required for pollen viability. Confers sensitivity to bacterial blight mediated by X.oryzae pv. oryzae (Xoo) in its Xa13 allelic form (e.g. cv. IR24), probably by providing the sugar required for the pathogen growth. However, a recessive resistance can be associated with the xa13 allele (in which the promoter is mutated leading to reduced induction upon pathogen infection, e.g. cv. IRBB13), specifically toward Xoo Philippine race 6 and Indian race PXO8 (PubMed:11606550, PubMed:16648463, PubMed:16798873). Forms homooligomers and/or heterooligomers. Mostly expressed in panicles and anthers. Also detected at low levels in leaves and roots. Accumulates to high levels in pollen grains, tapetal cells, and middle-layer cells of the anther wall. Also detected at high levels in connective tissue cells and the connective vascular element at the unicellular- to-bicellular pollen grain stages. At the tricellular pollen grain stage, confined to the cells of connective vascular elements. By the X.oryzae pv. oryzae (Xoo) transcription activator-like effector (TALe) protein pthXo1 and, possibly, AvrXa7. The induction by X.oryzae pv. oryzae (Xoo) PXO99 occurs only in the Xa13 allelic form that contains full promoter region. Belongs to the SWEET sugar transporter family.