Réponses de détoxication de deux génotypes de peuplier soumis à un stress ozone et sécheresse : rôle du métabolisme du glutathion

Abstract : Nowadays, plants are facing stronger environmental stresses because of climate change and atmospheric pollution. That leads to an increase of oxidative stress for trees. We particularly focus on the metabolism of glutathione because of his importance to regenerate ascorbate (the most important antioxidant for plants). To do that, we expose two genotypes of Populus nigra x deltoides (Carpaccio and Robusta) to various treatments during 17 days: a moderate drought, an ozone fumigation of 120 ppb or both treatments at the same time. To improve our understanding of the effect these stresses have, we measured some ecophysiological, biochimical and molecular parameters. Our results show a mild drought tolerance for both genotypes, with a high water use efficiency for Robusta. Furthermore, both genotypes show a different sensitivity to ozone stress. Indeed, Robusta shows more foliar damage. This difference of sensitivity could be the result of a lesser quality of detoxification and a loss of cell homeostasis. Nevertheless for Robusta, gene expression and enzymatic activities of glutathione reductase and dehydroascorbate reductase shows an early stage of reaction to oxidative stress. Thus, under ozone treatment, the phytotoxic threshold of Robusta may be reached before the one of Carpaccio.
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Master thesis
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Nicolas Dusart. Réponses de détoxication de deux génotypes de peuplier soumis à un stress ozone et sécheresse : rôle du métabolisme du glutathion. Sciences de l'environnement. 2014. ⟨hal-01836074⟩

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