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Iron deficiency-associated changes in the composition of the leaf apoplastic fluid from field-grown pear (Pyrus communis L.) trees

AuthorsLópez-Millán, Ana Flor CSIC; Morales Iribas, Fermín CSIC ORCID; Abadía Bayona, Anunciación CSIC ORCID ; Abadía Bayona, Javier CSIC ORCID
iron deficiency
iron chlorosis
organic acids
Issue DateJul-2001
PublisherOxford University Press
CitationJournal of Experimental Botany 52(360): 1489-1498 (2001)
AbstractExperiments have been carried out with field-grown pear trees to investigate the effect of iron chlorosis on the composition of the leaf apoplast. Iron deficiency was associated with an increase in the leaf apoplastic pH from the control values of 5.5–5.9 to 6.5–6.6, as judged from direct pH measurements in apoplastic fluid obtained by centrifugation and fluorescence of leaves incubated with 5-CF. The major organic acids found in leaf apoplastic fluid of iron-deficient and iron-sufficient pear leaves were malate, citrate and ascorbate. The total concentration of organic acids was 2.9 mM in the controls and increased to 5.5 mM in Fe-deficient leaves. The total apoplastic concentration of inorganic cations (Ca, K and Mg) increased with Fe deficiency from 15 to 20 mM. The total apoplastic concentration of inorganic anions (Cl-, NO3-, SO42- and HPO42-) did not change with Fe deficiency. Iron concentrations decreased from 4 to 1.6 µM with Fe deficiency. The major Fe species predicted to exist in the apoplast was [FeCitOH]-1 in both Fe-sufficient and deficient leaves. Organic acids in whole leaf homogenates increased from 20 to 40 nmol m-2 with Fe deficiency. The accumulation of organic anions in the Fe-deficient leaves does not appear to be associated to an increased C fixation in leaves, but rather it seems to be a consequence of C transport via xylem.
Publisher version (URL)
ISSN0022-0957 (Print)
1460-2431 (Online)
Appears in Collections:(EEAD) Artículos

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