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Calcium-(organo)aluminum-proton competition for adsorption to tomato root cell walls: Experimental data and exchange model calculations

Postma, Jacqueline LU ; Keltjens, W G and Van Riemsdijk, W H (2005) In Environmental Science & Technology 39(14). p.5247-5254
Abstract
Aluminum interacts with negatively charged surfaces in plant roots, causing inhibition of growth and nutrient uptake in plants growing on acid soils. Pectins in the root cell wall form the major cation adsorption surface, with Ca2+ as the main adsorbing cation. Adsorption of Al3+ and Ca2+ to isolated cell wall material of tomato (Lycopersicon esculentum L.) roots was examined at pH 3.00-4.25 and in the presence of the aluminum chelators citrate and malate. Al3+ displaced Ca2+ from its pectic binding sites in the cell wall to a large extent but apparently also bound to non-Ca binding groups, displacing protons. Aluminum adsorption depended on the pH of the solution, with little Al adsorbing to the cell wall material at very low pH (<... (More)
Aluminum interacts with negatively charged surfaces in plant roots, causing inhibition of growth and nutrient uptake in plants growing on acid soils. Pectins in the root cell wall form the major cation adsorption surface, with Ca2+ as the main adsorbing cation. Adsorption of Al3+ and Ca2+ to isolated cell wall material of tomato (Lycopersicon esculentum L.) roots was examined at pH 3.00-4.25 and in the presence of the aluminum chelators citrate and malate. Al3+ displaced Ca2+ from its pectic binding sites in the cell wall to a large extent but apparently also bound to non-Ca binding groups, displacing protons. Aluminum adsorption depended on the pH of the solution, with little Al adsorbing to the cell wall material at very low pH (< 3.50). Under very acid conditions Al3+ replacing Ca2+ at pectic cross-links is therefore not expected to play a role in X toxicity. Equimolar concentrations of citrate decreased Al competition for Ca binding sites almost completely, whereas malate only had an intermediate effect. The competition of (organo) Al3+, Ca2+, and H+ for cell wall binding sites was described adequately using the Gaines-Thomas exchange model. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Environmental Science & Technology
volume
39
issue
14
pages
5247 - 5254
publisher
The American Chemical Society
external identifiers
  • wos:000230536200023
  • pmid:16082953
  • scopus:22344455909
ISSN
1520-5851
DOI
10.1021/es048138v
language
English
LU publication?
yes
id
37693c98-77af-4d2e-ad65-0d85f4026b11 (old id 147077)
date added to LUP
2007-07-02 13:32:42
date last changed
2017-06-25 04:30:53
@article{37693c98-77af-4d2e-ad65-0d85f4026b11,
  abstract     = {Aluminum interacts with negatively charged surfaces in plant roots, causing inhibition of growth and nutrient uptake in plants growing on acid soils. Pectins in the root cell wall form the major cation adsorption surface, with Ca2+ as the main adsorbing cation. Adsorption of Al3+ and Ca2+ to isolated cell wall material of tomato (Lycopersicon esculentum L.) roots was examined at pH 3.00-4.25 and in the presence of the aluminum chelators citrate and malate. Al3+ displaced Ca2+ from its pectic binding sites in the cell wall to a large extent but apparently also bound to non-Ca binding groups, displacing protons. Aluminum adsorption depended on the pH of the solution, with little Al adsorbing to the cell wall material at very low pH (&lt; 3.50). Under very acid conditions Al3+ replacing Ca2+ at pectic cross-links is therefore not expected to play a role in X toxicity. Equimolar concentrations of citrate decreased Al competition for Ca binding sites almost completely, whereas malate only had an intermediate effect. The competition of (organo) Al3+, Ca2+, and H+ for cell wall binding sites was described adequately using the Gaines-Thomas exchange model.},
  author       = {Postma, Jacqueline and Keltjens, W G and Van Riemsdijk, W H},
  issn         = {1520-5851},
  language     = {eng},
  number       = {14},
  pages        = {5247--5254},
  publisher    = {The American Chemical Society},
  series       = {Environmental Science & Technology},
  title        = {Calcium-(organo)aluminum-proton competition for adsorption to tomato root cell walls: Experimental data and exchange model calculations},
  url          = {http://dx.doi.org/10.1021/es048138v},
  volume       = {39},
  year         = {2005},
}