Potato Research

, Volume 43, Issue 4, pp 383–393 | Cite as

Expression and activity of antioxidant enzymes during potato tuber dormancy

  • J. A. Rojas-Beltran
  • F. Dejaeghere
  • M. Abd Alla Kotb
  • P. Du Jardin
Full Papers

Summary

The expression of antioxidant genes has been analyzed in a potato plant and during tuber dormancy. Manganese superoxide dismutase (MnSOD), cytosolic copper and zinc superoide dismutase (Cu/ZnSOD), catalase class II, cytosolic ascorbate peroxidase (APX) and glutathione peroxidase (GPX) are expressed at the RNA level in all the contexts analyzed. By contrast, the expression of the iron superoxide dismutase (FeSOD) and plastidic Cu/ZnSOD seems to be limited to green tissues, as shown by northern blots and native gels. A complex DAB-peroxidase isozyme pattern (using diaminobenzidine as substrate) has been observed in different developmental contexts analyzed, but hardly observed in tubers. During tuber dormancy, MnSOD and cytosolic Cu/ZnSOD activity was relatively constant in both Désirée and Bintje varieties while catalase activity decreases. Moreover, tuber dormancy breakage did not involve significant changes in the activity of these enzymes. On the basis of these results, the possible link between active oxygen species (AOS) metabolism and dormancy is discussed.

Additional keywords

Solanum tuberosum L. plant development antioxidant genes gene expression 

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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • J. A. Rojas-Beltran
    • 1
  • F. Dejaeghere
    • 1
  • M. Abd Alla Kotb
    • 1
  • P. Du Jardin
    • 1
  1. 1.Unité de Biologie VégétaleFaculté Universitaire des Sciences AgronomiquesGemblouxBelgium

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