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Acceleration of potato tuber sprouting by the expression of a bacterial pyrophosphatase

Abstract

Potato is a globally important crop. Unfortunately, potato farming is plagued with problems associated with the sprouting behavior of seed tubers. The data presented here demonstrate that using transgenic technology can influence this behavior. Transgenic tubers cytosolically expressing an inorganic pyrophosphatase gene derived from Escherichia coli under the control of the tuber-specific patatin promoter display significantly accelerated sprouting. The period of presprouting dormancy for transgenic tubers planted immediately after harvest is reduced by six to seven weeks when compared to wild-type tubers. This study demonstrates a method with which to regulate dormancy, an important aspect of potato crop management.

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Figure 1: Pyrophosphate concentration in developing tubers.
Figure 2: Sprouting behavior of nonstored (A) and cold-stored (B) tubers.
Figure 3: Early-sprouting behavior of PP lines.
Figure 4: Comparison of the sprouting behavior of tubers from transgenic plants expressing the pyrophosphatase gene under the control of either the tuber-specific promoter B33 (lines PP-51, PP-47, and PP-43) or the constitutive CaMV 35S promoter (lines (35S)ppa1-55 and (35S)ppa1-2).

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Acknowledgements

The authors would like to thank Jessyca Dietze for performing the plant transformation, Helga Fleischer-Notter for technical support, and Linda Bartetzko, Britta Hausmann, Kathrin Lepa, Olaf Woiwode, and Bruno Marty for excellent greenhouse work and Dr. U. Sonnewald for the (35S)ppa1 plants. This research was supported by a grant from the Max-Planck Society to E.M.F.

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Correspondence to Eva M. Farré.

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Farré, E., Bachmann, A., Willmitzer, L. et al. Acceleration of potato tuber sprouting by the expression of a bacterial pyrophosphatase. Nat Biotechnol 19, 268–272 (2001). https://doi.org/10.1038/85726

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