Plant Molecular Biology

, Volume 63, Issue 5, pp 719–730 | Cite as

ci21A/Asr1 expression influences glucose accumulation in potato tubers

  • Nicolás Frankel
  • Adriano Nunes-Nesi
  • Ilse Balbo
  • Jeannine Mazuch
  • Danilo Centeno
  • Norberto D. Iusem
  • Alisdair R. Fernie
  • Fernando Carrari


Asr genes are exclusively found in the genomes of higher plants. In many species, this gene family is expressed under abiotic stress conditions and during fruit ripening. The encoded proteins have nuclear localisation and consequently a transcription factor function has been suggested. Interestingly, yeast-one-hybrid experiments revealed that a grape ASR binds to the promoter of a hexose transporter gene (VvHT1). However, the role of these proteins in planta is still elusive. By using a reverse genetics approach in potato we found that modification of Asr1 expression has no incidence on the aerial phenotype of the plant but exerts a dramatic effect in tuber. Asr1 antisense potatoes displayed decreased tuber fresh weight whereas Asr1 overexpressors had a diminished number of tubers. Moreover, overexpression lines showed lower transcript levels of a plasma membrane hexose transporter and a concomitant decrease in glucose content in parenchyma cells of potato tubers. On the same hand glucose uptake rate was also reduced in one of the overexpressing lines. It thus seems likely that Asr1 is involved in the control of hexose uptake in heterotrophic organs. In addition, the transgenic plants were characterized by several other changes in steady state metabolite levels. Results presented here support a role for ci21A/Asr1 in glucose metabolism of potato tuber.


Tomato Asr genes Hexose metabolism Potato tuber 



We are grateful to Prof. Lothar Willmitzer for support and helpful discussion. We acknowledge the excellent care of greenhouse plants to Helga Kulka. We acknowledge financial support from Max Planck Society (ARF, AN, and FC), DAAD (NF and DC), EMBO (NF and FC), University of Buenos Aires (NDI), CONICET (NF, FC and NDI) and INTA (FC).

Supplementary material

11103_2006_9120_MOESM1_ESM.pdf (174 kb)
ESM1 (PDF 1,760 kb)
11103_2006_9120_Fig7_ESM.gif (89 kb)
Fig. S1

Photosynthetic parameters of the transgenic lines. (A) Assimilation rate, (B) transpiration rate and (C) stomata conductance as a function of PFD. Values presented are the mean ± SE (n = 6)

11103_2006_9120_MOESM2_ESM.pdf (1.7 mb)
ESM2 (PDF 175 kb)
11103_2006_9120_Fig8_ESM.gif (21 kb)
Fig. S2

mRNA levels measured by real time RT-PCR of hexose transporters (HvHT and LeHT2) in potato tubers. Wild type tubers from 10 week-old plants were incubated in MESKOH 10 mM pH 6.5 for four hours with (black bars) or without (white bars) ABA. Values represent mean ± SE (n = 3).


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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Nicolás Frankel
    • 1
  • Adriano Nunes-Nesi
    • 2
  • Ilse Balbo
    • 2
  • Jeannine Mazuch
    • 2
  • Danilo Centeno
    • 2
  • Norberto D. Iusem
    • 1
  • Alisdair R. Fernie
    • 2
  • Fernando Carrari
    • 3
  1. 1.Laboratorio de Fisiología y Biología Molecular, IFIBYNE-Conicet, Facultad de Ciencias Exactas y NaturalesUniversidad de Buenos AiresBuenos AiresArgentina
  2. 2.Max-Planck Institute for Molecular Plant PhysiologyPotsdam-GolmGermany
  3. 3.Instituto de BiotecnologíaInstituto Nacional de Tecnología Agrícola (IB-INTA), CICV-INTACastelarArgentina

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