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Cadmium and copper genotoxicity in plants

  • Chamseddine Mediouni
  • Guy Houlné
  • Marie-Edith Chabouté
  • Mohamed Habib Ghorbel
  • Fatma Jemal

Abstract

Heavy metal contamination in soils is easily transmitted to human through plants via the food chain. A major concern is to understand the plant response to heavy metal soil contamination to develop phytoremediation. Two plant models have been investigated in our study, the tomato, which is of agronomical importance, Arabidopsis, which is used as a model for molecular genetics. Heavy metal toxicity is described to induce oxidative stress linked to oxidation of proteins and membrane lipids but also to alterations of DNA damage response. We have investigated the metabolic response of cadmium and copper in parallel in both plant models and analyzed the transcriptional response of Arabidopsis RNR genes coding for isoforms of ribonucleotide reductase, an essential enzyme involved in DNA synthesis. Both Cd and Cu had a dose-dependent effect on plant growth. We also observed a rapid increase of catalase activity upon Cd or Cu treatments in tomato and Arabidopsis. At the transcriptional level, treatment with Cd resulted in a biphasic induction of two RNR genes in Arabidopsis; the first induction peak could be paralleled to the increase of the catalase activity.

Keywords

Heavy Metal Ribonucleotide Reductase TBARS Content Heavy Metal Treatment Phytochelatin Synthesis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Birkhäuser Verlag/Switzerland 2008

Authors and Affiliations

  • Chamseddine Mediouni
    • 1
    • 2
  • Guy Houlné
    • 2
  • Marie-Edith Chabouté
    • 2
  • Mohamed Habib Ghorbel
    • 1
  • Fatma Jemal
    • 1
  1. 1.Unité de Recherche “Nutrition et Métabolisme Azotés et Protéines de Stress” UR 99/09-20, Faculté des Sciences de TunisUniversité Tunis EL-MANARTunisie
  2. 2.Institut de Biologie Moléculaire des PlantesEquipe Signalisation de la réparation de l‘ADNStrasbourg CedexFrance

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