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Published on December 14, 2007; 10.1104/pp.107.112334

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Received November 2, 2007
Accepted December 6, 2007

The sucrose transporter StSUT4 from Solanum tuberosum affects flowering, tuberization and shade avoidance response

Izabela A. Chincinska , Johannes Liesche , Undine Krügel , Justyna Michalska , Peter Geigenberger , Bernhard Grimm , and Christina Kühn *

Institute of Biology, Plant Physiology, Humboldt University, Philippstrasse 13, Building 12, 10115 Berlin, Germany; Max Planck Institut für molekulare Pflanzenphysiologie, Am Mühlenberg 114476 Potsdam – Golm, Germany

* Corresponding author; email: christina.kuehn{at}biologie.hu-berlin.de.

Sucrose transporters belong to a large gene family. The physiological role of SUT1 proteins has been intensively investigated in higher plants, while that of SUT4 proteins is so far unknown. All three known sucrose transporters from potato SUT1, SUT2 and SUT4 are co-localized and their RNA levels not only follow a diurnal rhythm, but oscillate in constant light. Here, we examined the physiological effects of transgenic potato plants on RNAi-inactivated StSUT4-expression. The phenotype of StSUT4-RNAi plants includes early flowering, higher tuber production and a reduced sensitivity towards light enriched in far-red wavelength (i.e. in canopy shade). Inhibition of StSUT4 led to tuber production of the strict photoperiodic variety Solanum tuberosum subsp. andigena even under non-inductive LD conditions. Accumulation of soluble sugars and sucrose efflux from leaves of the transgenic plants are modified in StSUT4-RNAi plants leading to modified sucrose levels in sink organs. StSUT4 expression of wild-type plants is induced by gibberellins and ethephon, and external supply of GA3 leads to even more pronounced differences between WT and StSUT4-RNAi plants regarding tuber yield and internode elongation, indicating a reciprocal regulation of StSUT4 and gibberellins.






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