Source-Sink Regulation Is Mediated by Interaction of an FT Homolog with a SWEET Protein in Potato

Journal article


Publication Details

Author(s): Abelenda JA, Bergonzi S, Oortwijn M, Sonnewald S, Du M, Visser RGF, Sonnewald U, Bachem CWB
Journal: Current Biology
Publication year: 2019
Volume: 29
Journal issue: 7
Pages range: 1178-+
ISSN: 0960-9822


Abstract

Potato plants form tuberous storage organs on underground modified stems called stolons. Tubers are rich in starch, proteins, and other important nutrients, making potato one of the most important staple food crops. The timing of tuber development in wild potato is regulated by day length through a mechanism that is closely related to floral transition [1, 2]. Tuberization is also known to be regulated by the availability of assimilates, in particular sucrose, the transported form of sugar, required for starch synthesis. During the onset of tuber development, the mode of sucrose unloading switches from apoplastic to symplastic [3]. Here, we show that this switch may be mediated by the interaction between the tuberization-specific FT homolog StSP6A and the sucrose efflux transporter StSWEET11 [4]. The binding of StSP6A to StSWEET11 blocked the leakage of sucrose to the apoplast, and is therefore likely to promote symplastic sucrose transport. The direct physical interaction between StSWEET11 and StSP6A proteins represents a link between the sugar and photoperiodic pathways for the regulation of potato tuber formation. Our data suggest that a previously undiscovered function for the FT family of proteins extends their role as mobile signals to mediators of source-sink partitioning, opening the possibility for modifying source-sink interactions.


FAU Authors / FAU Editors

Sonnewald, Sophia PD Dr.
Lehrstuhl für Biochemie
Sonnewald, Uwe Prof. Dr.
Lehrstuhl für Biochemie


External institutions with authors

Wageningen University & Research


How to cite

APA:
Abelenda, J.A., Bergonzi, S., Oortwijn, M., Sonnewald, S., Du, M., Visser, R.G.F.,... Bachem, C.W.B. (2019). Source-Sink Regulation Is Mediated by Interaction of an FT Homolog with a SWEET Protein in Potato. Current Biology, 29(7), 1178-+. https://dx.doi.org/10.1016/j.cub.2019.02.018

MLA:
Abelenda, Jose A., et al. "Source-Sink Regulation Is Mediated by Interaction of an FT Homolog with a SWEET Protein in Potato." Current Biology 29.7 (2019): 1178-+.

BibTeX: 

Last updated on 2019-15-04 at 21:08