Sucrose Transporter StSUT4 from Potato Affects Flowering, Tuberization, and Shade Avoidance Response

• DOI: 10.1104/pp.107.112334
• Publication Date: 2007-12-15T01:46:14Z
• Authors: Izabela A. Chinci...; Johannes Liesche; Undine Krügel; Justyna Michalska; Peter Geigenberger; Bernhard Grimm; Christina Kühn
• Keywords: 2. Zero hunger; 0303 health sciences; Time Factors; Light; Cell Membrane; Molecular Sequence Data; Membrane Transport Proteins; Flowers; Gibberellins; Plant Tubers; 03 medical and health sciences; Gene Expression Regulation, Plant; Carbohydrate Metabolism; RNA Interference; Phototropism; Plant Proteins; Signal Transduction; Solanum tuberosum

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