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Título : Carboxylate metabolism in sugar beet plants grown with excess Zn
Autor : Sagardoy Calderón, Ruth ; Morales Iribas, Fermín ; Rellán-Álvarez, Rubén ; Abadía Bayona, Anunciación ; Abadía Bayona, Javier ; López-Millán, Ana Flor
Palabras clave : Heavy metal toxicity
Carboxylate metabolism
Sugar beet
Zn toxicity
Fecha de publicación : may-2011
Editor: Elsevier
Citación : Sagardoy 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)
Resumen: The 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.
Descripción : 4 Pag., 2 Tabl., 1 Fig. The definitive version is available at: http://www.sciencedirect.com/science/journal/01761617
Versión del editor: http://dx.doi.org/10.1016/j.jplph.2010.10.012
URI : http://hdl.handle.net/10261/37467
DOI: 10.1016/j.jplph.2010.10.012
ISSN: 0176-1617
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