Planta

, Volume 217, Issue 1, pp 158–167 | Cite as

Overexpression of the sucrose transporter SoSUT1 in potato results in alterations in leaf carbon partitioning and in tuber metabolism but has little impact on tuber morphology

  • Georg Leggewie
  • Anna Kolbe
  • Rémi Lemoine
  • Ute Roessner
  • Anna Lytovchenko
  • Ellen Zuther
  • Julia Kehr
  • Wolf B. Frommer
  • Jörg W. Riesmeier
  • Lothar Willmitzer
  • Alisdair R. Fernie
Original Article
  • 370 Downloads

Abstract

The aim of this work was to examine the consequences of the heterologous expression of a spinach (Spinacia oleracea L.) sucrose transporter (SoSUT1) in potato (Solanum tuberosum L.). Many studies have indicated that reduction of the expression of this class of sucrose transporter has deleterious effects on plant growth and development; however, until now the possibility of improving plant performance by enhancing the expression of this sucrose transporter has not been reported. With this intention we constructed a chimeric construct in which SoSUT1 was cloned in-frame with the myc epitope. We confirmed that this construct, SoSUT1m, was able to mediate sucrose transport by expression in the yeast strain SUSY7. SoSUT1m was expressed in wild-type potato in the sense orientation under the control of the cauliflower mosaic virus 35S promoter to evaluate the effect of an increased constitutive expression of a class-I sucrose transporter. We confirmed that these plants displayed expression of SoSUT1 at both the transcript and protein level and that microsomal fragments isolated from selected lines had an increased sucrose uptake capacity. Analysis of metabolism of these lines indicated that the leaves were characterised by a reduced sucrose level yet exhibited little change in photosynthetic rate. Furthermore, despite the observed increase in sugar (and reduction in amino acid) levels within the tubers, there was little change in either starch content or tuber yield in the transformants. In summary, the genetic manipulation described in this paper resulted in a shift in carbon partitioning in both leaves and tubers and an increased sucrose uptake rate in plasma-membrane vesicles isolated from these lines, but had little impact on tuber metabolism or morphology.

Keywords

Carbohydrate metabolism Metabolite analysis Phenocopy Solanum Sucrose transport Transitory starch 

Abbreviations

CaMV

cauliflower mosaic virus

CCCP

carbonylcyanide m-chlorophenylhydrazone

2,4-D

2,4-dinitrophenol

PAR

photosynthetically active radiation

PCMBS

p-chloromercuribenzenesulphonic acid

PMF

proton-motive force

QTL

quantitative trait loci

SUT

sucrose transporter

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • Georg Leggewie
    • 1
  • Anna Kolbe
    • 1
  • Rémi Lemoine
    • 2
  • Ute Roessner
    • 1
  • Anna Lytovchenko
    • 1
  • Ellen Zuther
    • 1
  • Julia Kehr
    • 1
  • Wolf B. Frommer
    • 3
  • Jörg W. Riesmeier
    • 4
  • Lothar Willmitzer
    • 1
  • Alisdair R. Fernie
    • 1
  1. 1.Max-Planck-Institut für Molekulare PflanzenphysiologieGolmGermany
  2. 2.Bâtiment BotaniqueLaboratoire de Physiologie et Biochemie Végétales, ESA CNRS 6161PoitiersFrance
  3. 3.Institut für BotanikEberhard-Karls-UniversitätTübingenGermany
  4. 4.PlantTec Biotechnologie GmbHPotsdamGermany

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