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Background  Biotrophic fungi make intimate contact with host cells to access nutrients. Sugar is considered as the main carbon sources absorbed from host cells by pathogens. Partition, exchanges and competition for sugar at plant-pathogen interfaces are controlled by sugar transporters. Previous studies have indicated that the leaf rust resistance (Lr) gene  Lr67 , a natural mutation of  TaSTP13  encoding a wheat sugar transport protein, confers partial resistance to all three wheat rust species and powdery mildew possibly due to weakened sugar transport activity of TaSTP13 by heterodimerization. However, one major problem that remains unresolved concerns whether  TaSTP13  participates in wheat susceptibility to rust and mildew.    Results  In this study, expression of  TaSTP13  was highly induced in wheat leaves challenged by  Puccinia striiformis  f. sp.  tritici  ( Pst ) and certain abiotic treatments. TaSTP13 was localized in the plasma membrane and functioned as homooligomers. In addition, a functional domain for its transport activity was identified in yeast. Suppression of  TaSTP13  reduced wheat susceptibility to  Pst  by barley stripe mosaic virus-induced gene silencing (VIGS). While overexpression of  TaSTP13  promoted  Arabidopsis  susceptibility to powdery mildew and led to increased glucose accumulation in the leaves.    Conclusions  These results indicate that  TaSTP13  is transcriptionally induced and contributes to wheat susceptibility to stripe rust, possibly by promoting cytoplasmic hexose accumulation for fungal sugar acquisition in wheat- Pst  interactions.

TaSTP13 contributes to wheat susceptibility to stripe rust possibly by increasing cytoplasmic hexose concentration