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Background  To maintain sweetpotato ( Ipomoea batatas  (L.) Lam) growth and yield, sucrose must be transported from the leaves to the roots. Sucrose transporters or carriers (SUTs or SUCs) transport sucrose and are involved in plant growth and response to abiotic stress. However, the mechanisms of SUTs in sweetpotato abiotic stress resistance remains to be determined.    Results  In the present study, we cloned a novel  IbSUT4  gene; the protein encoded by this gene is localized in the tonoplast and plasma membrane. The plant growth was promoted in the  IbSUT4  transgenic  Arabidopsis thaliana  lines, with increased expression of  AtFT , a regulator of flowering time in plants. Over-expression of  IbSUT4  in  Arabidopsis thaliana  resulted in higher sucrose content in the roots and lower sucrose content in the leaves, as compared to the wild-type (WT) plants, leading to improved stress tolerance during seedling growth. Moreover, we systematically analyzed the mechanisms of  IbSUT4  in response to abiotic stress. The results suggest that the ABRE-motif was localized in the  IbSUT4  promoter region, and the expression of the ABA signaling pathway genes (i.e.,  ABF2 ,  ABF4 ,  SnRK2.2 ,  SnRK2.3,  and  PYL8/RCAR3 ) were induced, and the expression of  ABI1  was inhibited.    Conclusions  Our dates provide evidence that  IbSUT4  is not only involved in plant growth but also is an important positive regulator in plant stress tolerance through the ABF-dependent ABA signaling pathway.

bmc plant biology

A novel sucrose transporter gene IbSUT4 involves in plant growth and response to abiotic stress through the ABF-dependent ABA signaling pathway in Sweetpotato