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Acta Biologica Hungarica

, Volume 61, Issue 2, pp 191–203 | Cite as

Cupric Stress Induces Oxidative Damage Marked by Accumulation Of H2O2 and Changes to Chloroplast Ultrastructure in Primary Leaves of Beans (Phaseolus vulgaris L.)

  • Houda Bouazizi
  • Hager Jouili
  • Anja Geitmann
  • Ezzeddine El FerjaniEmail author
Article
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Abstract

The effect of copper excess (CuSO4) on lipid peroxidation, H2O2 content, and antioxidative enzyme activities was studied in primary leaves of bean seedlings. Fourteen-day-old bean seedlings were cultured in a nutrient solution containing Cu2+ at various concentrations (50 and 75 μM) for 3 days. Excess of copper significantly increased malondialdehyde content and endogenous H2O2. This radical accumulated in the intercellular spaces of palisade mesophyll cells. In addition, cupric stress induced changes in antioxidant enzyme activities. GPX (guaiacol peroxidase, EC 1.11.1.7) activity was decreased in 50 μM Cu-stressed leaves whereas 75 μM of CuSO4 resulted in an increase of enzyme activity. On the contrary, CAT (catalase, EC 1.11.1.6) activity was stimulated at 50 μM CuSO4 but unaltered at 75 μM CuSO4. Transmission electron microscopy revealed that excess copper induced changes in the ultrastructure of chloroplasts visible in form of a deterioration in the grana structure and the accumulation and swelling of starch grains in the stroma.

Keyword

Bean chloroplast copper H2O2 oxidative stress 
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© Akadémiai Kiadó, Budapest 2010

This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  • Houda Bouazizi
    • 1
  • Hager Jouili
    • 1
  • Anja Geitmann
    • 2
  • Ezzeddine El Ferjani
    • 1
    Email author
  1. 1.Laboratory of Bio-Cell PhysiologyFaculty of Sciences BizerteZarzounaTunisia
  2. 2.Department of Biological Sciences, Institute Research in Plant BiologyUniversity of MontrealMontrealCanada

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