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Título

Changes in iron and organic acid concentrations in xylem sap and apoplastic fluid of iron-deficient Beta vulgaris plants in response to iron resupply

Autor Larbi, Ajmi ; Morales Iribas, Fermín ; Abadía Bayona, Anunciación ; Abadía Bayona, Javier
Palabras clave Apoplastic fluid
Iron deficiency
Resupply
Sugar beet
Xylem sap
Fecha de publicación mar-2010
EditorElsevier
Citación Larbi A, Morales F, Abadía A, Abadía J. Changes in iron and organic acid concentrations in xylem sap and apoplastic fluid of iron-deficient Beta vulgaris plants in response to iron resupply. Journal of Plant Physiology 167 (4): 255–260 (2010)
ResumenIn this study, the effects of Fe resupply on the composition of the xylem sap and apoplastic fluid of Fe-deficient sugar beet plants were investigated. Experiments were carried out in growth chambers with plants grown in hydroponics, and Fe resupply to Fe-deficient plants was carried out by adding 45 μM Fe(III)–EDTA to the nutrient solution. In the short term (within 24 h), Fe resupply caused marked changes in the xylem sap and apoplastic fluid composition and in leaf physiological parameters when de novo chlorophyll (Chl) synthesis was still beginning. Major changes included: (i) 10- and 5-fold increases in Fe concentrations in apoplastic fluid and xylem sap, respectively; (ii) marked decreases in the concentrations of organic acids in apoplastic fluid, but not in xylem sap and (iii) large decreases in the citrate/Fe ratios, both in apoplastic fluid and in xylem sap. Two to four days after Fe resupply, xylem sap and apoplastic fluid Fe and organic acid concentrations and pH reached values similar to those obtained in Fe-sufficient leaves. Leaf mesophyll ferric chelate-reductase (FC-R) activities and photosynthetic rates increased gradually during recovery from Fe deficiency.
Descripción 6 Pags., 6 figs.
Versión del editorhttp://dx.doi.org/10.1016/j.jplph.2009.09.007
URI http://hdl.handle.net/10261/45247
DOI10.1016/j.jplph.2009.09.007
ISSN0176-1617
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