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• W2016066822 abstract "Des plantules de tomate cultivées sur milieu nitrique et traitées par différentes concentrations de cadmium (0 à 50 μM) sont utilisées. Les résultats obtenus montrent que le cadmium reste majoritairement confiné au système racinaire, qui semble ainsi jouer le rôle d'organe piège pour ce polluant. L'augmentation de la dose de cadmium dans le milieu de culture conduit notamment à une baisse de l'accumulation de NO3−, accompagnée d'une diminution de l'activité glutamine synthétase et de la quantité des ARNm de la glutamine synthétase plastidiale (GS2) et, au contraire, une augmentation de celle de l'isoforme cytosolique (GS1). En même temps sont enregistrées des stimulations de l'activité glutamate synthase NADH dépendante, de la glutamate déshydrogénase NADH dépendante, de la quantité des ARNm de cette dernière, de l'accumulation de l'ammonium et de l'activité protéasique. En parallèle, des stimulations sont observées dans l'activité malate déshydrogénase NAD+ et NADP+ dépendante et l'activité isocitrate déshydrogénase NADP+ dépendante. Ces résultats sont discutés dans le cadre d'une hypothèse attribuant aux activités déshydogénasiques (GDH, MDH, ICDH) un rôle important dans les processus de défense de la tomate contre le stress induit par le cadmium. Pour citer cet article : C. Chaffei et al., C. R. Biologies 329 (2006). Tomato seedlings grown on nitric medium and treated with various cadmium concentrations (0 to 50 μM) were used. Results obtained show that cadmium remains predominantly located in the roots, which then seem to play the role of trap-organs. Increasing cadmium concentration in the medium leads particularly to a decrease in NO3− accumulation, together with a decrease in the activity of glutamine synthetase and in the quantity of plastidic isoform ARNm (GS2), and, on the contrary, to an increase of the cytosolic isoform ARNm (GS1). On the other hand, stimulations were observed for NADH-dependent glutamate synthase, NADH-dependent glutamate dehydrogenase, ARNm quantity of this enzyme, ammonium accumulation, and protease activity. In parallel, stimulations were observed for NAD+ and NADP+-dependent malate dehydrogenase and NADP+-dependent isocitrate dehydrogenase. These results were discussed in relation to the hypothesis attributing to the dehydrogenase enzymes (GDH, MDH, ICDH) an important role in the plant defence processes against cadmium-induced stresses. To cite this article: C. Chaffei et al., C. R. Biologies 329 (2006)." @default.
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• W2016066822 date "2006-10-01" @default.
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• W2016066822 title "Implication du glutamate, de l'isocitrate et de la malate déshydrogénases dans l'assimilation de l'azote chez la tomate stressée par le cadmium" @default.
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• W2016066822 doi "https://doi.org/10.1016/j.crvi.2006.06.008" @default.
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