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Possibile role of the polyuronic components in accumulation and mobilization of iron and phosphate at the soil-root interface

Deiana, Salvatore Andrea and Palma, Amedeo and Premoli, Alessandra Maria and Senette, Caterina (2007) Possibile role of the polyuronic components in accumulation and mobilization of iron and phosphate at the soil-root interface. Plant Physiology and Biochemistry, Vol. 45 (5), p. 341-349. eISSN 1873-2690. Article.

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DOI: 10.1016/j.plaphy.2007.03.025


With the aim to investigate the role of the polyuronic components in the accumulation of iron and phosphate at the soil-root interface, the interactions of Ca-polygalacturonates (PGAs) with Fe(III) and P ions and of Fe(III)-Ca-polygalacturonates (Fe-PGAs) with P ions were studied at pH 4.7. The role of citric, malic and pyruvic acids in the mobilization of Fe(III) and P, in the presence and absence of Ca(II) 2.5 mM, was also investigated. The sorption kinetics evidenced that P diffuses freely through the calcium polysaccharidic matrix whereas Fe(III) accumulates as an hydroxypolymer. The sorption kinetics of P by the Fe-PGA indicated that the amount of P sorbed increases with increasing its initial concentration up to a constant value equal to 0.98 μmol/3.87 μmol mg-1 of Fe(III)-polymer trapped. The FT-IR spectra of the P-Fe-PGA systems, show bands attributable to P-O(H) stretching vibrations. The study of systems with a constant initial P amount and varying Fe(III) amounts allowed to hypothesize that phosphate settles down inside holes formed by the carboxylate groups of galacturonic units. Citric and malic acids showed to be active in the mobilization of both Fe and P whereas pyruvic acid appeared inactive.

Item Type:Article
ID Code:6847
Uncontrolled Keywords:Iron, phosphate, Polygalacturonic acid, organic acids, soil–root interface
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/13 Chimica agraria
Divisions:002 Altri enti e centri di ricerca del Nord Sardegna > CNR-Consiglio Nazionale delle Ricerche > Istituto di scienze delle produzioni alimentari, Sassari
001 Università di Sassari > 01 Dipartimenti > Scienze ambientali agrarie e biotecnologie agro-alimentari
Publisher:Elsevier Masson
Deposited On:13 Dec 2011 09:28

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