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dc.contributor.authorSagardoy Calderón, Ruth-
dc.contributor.authorMorales Iribas, Fermín-
dc.contributor.authorRellán-Álvarez, Rubén-
dc.contributor.authorAbadía Bayona, Anunciación-
dc.contributor.authorAbadía Bayona, Javier-
dc.contributor.authorLópez-Millán, Ana Flor-
dc.identifier.citationSagardoy R, Morales F, Rellán-Álvarez R, Abadía A, Abadía J, López-Millán AF. Carboxylate metabolism in sugar beet plants grown with excess Zn. Journal of plant physiology 168 (7): 730-733 (2011)es_ES
dc.description4 Pag., 2 Tabl., 1 Fig. The definitive version is available at: http://www.sciencedirect.com/science/journal/01761617es_ES
dc.description.abstractThe effects of Zn excess on carboxylate metabolism were investigated in sugar beet (Beta vulgaris L.) plants grown hydroponically in a growth chamber. Root extracts of plants grown with 50 or 100 M Zn in the nutrient solution showed increases in several enzymatic activities related to organic acid metabolism, including citrate synthase and phosphoenolpyruvate carboxylase, when compared to activities in control root extracts. Root citric and malic acid concentrations increased in plants grown with 100 M Zn, but not in plants grown with 50 M Zn. In the xylem sap, plants grown with 50 and 100 M Zn showed increases in the concentrations of citrate and malate compared to the controls. Leaves of plants grown with 50 or 100 MZn showed increases in the concentrations of citric and malic acid and in the activities of citrate synthase and fumarase. Leaf isocitrate dehydrogenase increased only in plants grown with 50 M Zn when compared to the controls. In plants grown with 300 M Zn, the only enzyme showing activity increases in root extracts was citrate synthase, whereas the activities of other enzymes decreased compared to the controls, and root citrate concentrations increased. In the 300 MZn-grown plants, the xylem concentrations of citric and malic acids were higher than those of controls, whereas in leaf extracts the activity of fumarase increased markedly, and the leaf citric acid concentration was higher than in the controls. Based on our data, a metabolic model of the carboxylate metabolism in sugar beet plants grown under Zn excess is proposed.es_ES
dc.description.sponsorshipThis work was supported by the Spanish Ministry of Science and Innovation (grant AGL2007-61948, co-financed with FEDER) and the Aragón Government (group A03). The HPLC–TOFMS apparatus was co-financed with FEDER. R.S. and R.R-A were supported by I3P-CSIC and FPI-MCINN pre-doctoral fellowships, respectively.es_ES
dc.subjectHeavy metal toxicityes_ES
dc.subjectCarboxylate metabolismes_ES
dc.subjectSugar beetes_ES
dc.subjectZn toxicityes_ES
dc.titleCarboxylate metabolism in sugar beet plants grown with excess Znes_ES
dc.description.peerreviewedPeer reviewedes_ES
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