High expression of GUS activities in sweet potato storage roots by sucrose-inducible minimal promoter

  • Youhei Honma
  • Takashi YamakawaEmail author
Original Article


Key message

We developed transgenic sweet potato with Spomin (sucrose-inducible minimal promoter)-GUS gene-fused constructs. Induced GUS activities by Spomin were higher than those by CaMV 35S promoter.


We developed transgenic sweet potato (Ipomoea batatas L. Lam. cv. Kokei no. 14) plants with Spomin (sucrose-inducible minimal promoter)-GUS gene-fused constructs with signal peptides for sorting to cytosol, apoplast and ER, and we analyzed the GUS expression pattern of cut tissue after sucrose treatment. Induced GUS activities by Spomin were several hundred times higher than those by the CaMV 35S promoter. Also, GUS activities in storage roots induced with a Spomin–cytosol-GUS construct were higher than those with either Spomin–apoplast or –ER-GUS constructs. The induced GUS activities by Spomin were higher in storage roots without sucrose treatment than those with sucrose treatment. Chilling (4 °C) storage roots with Spomin constructs for 4 weeks produced higher GUS activities than in storage roots stored at 25 °C for 4 weeks. The calculated maximum GUS content in the storage roots was up to about 224.2 μg/g fresh weight. The chilling treatment increased the free sucrose content in the storage roots, and this increase in endogenous sugar levels induced increased GUS activities in the storage roots. Therefore, Spomin appears to be a useful promoter to develop protein production systems using sweet potato variety Kokei no. 14 storage roots by postharvest treatment.


GUS Sucrose-inducible promoter Sweet potato Storage roots Chilling treatment 





Sucrose-inducible minimal promoter


Endoplasmic reticulum


Untranslated region


Semi-quantitative reverse transcription polymerase chain reaction


Hygromycin phosphotransferase



We would like to express our thanks to Dr. Elizabeth Hood of ProdiGene Inc. (Present address: Arkansas State University) for providing A. tumefaciens strain EHA105.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

299_2019_2453_MOESM1_ESM.pdf (347 kb)
Supplementary material 1 (PDF 346 kb)


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Global Agricultural SciencesThe University of TokyoTokyoJapan

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