Factors affecting aluminium sorption by calcium pectate

Blamey F.P.C., Asher C.J., Kerven G.L. and Edwards D.G. (1993) Factors affecting aluminium sorption by calcium pectate. Plant and Soil, 149 1: 87-94. doi:10.1007/BF00010765


Author Blamey F.P.C.
Asher C.J.
Kerven G.L.
Edwards D.G.
Title Factors affecting aluminium sorption by calcium pectate
Journal name Plant and Soil   Check publisher's open access policy
ISSN 0032-079X
Publication date 1993-01-01
Sub-type Article (original research)
DOI 10.1007/BF00010765
Open Access Status Not yet assessed
Volume 149
Issue 1
Start page 87
End page 94
Total pages 8
Subject 1111 Nutrition and Dietetics
1110 Nursing
1102 Cardiovascular Medicine and Haematology
Abstract Extracellular processes, particularly the adsorption of aluminium (Al) by pectate in the cell wall, have been proposed as important in the expression of Al toxicity to plant roots. In vitro studies were conducted on the effects of Al concentration (generally ≤ 32 μM), calcium (Ca) concentration (0.05 to 10 m M) and pH (3.2 to 5.4) on Al sorption by Ca pectate. There was a rapid reaction between Al and Ca pectate, there being no difference in Al remaining in solution after reaction times of 1 to 16 min, and only a slight decrease after 24 h. Increased Al concentration in solution increased linearly the sorption of Al by Ca pectate, with 70 to 84% of the Al originally in solution sorbed with ≤32 μM Al. In contrast, Al sorption decreased with increased Ca concentration in solution, and as pH decreased from 5.4 to 3.2. Only ≤30% of the sorbed Al was desorbed after 1 h by 1 m M CaCl2, 10 m M CaCl2 or 1 m M HCl. The amount of Al desorbed increased with a desorption period of 5 h, particularly with 1 m M HCl. These studies suggest that Al sorbed by Ca pectate in root cell walls is in equilibrium with Al in solution, and that Al toxicity is associated with the strong binding between Al and Ca pectate external to the cytoplasm.
Keyword aluminium
calcium
calcium pectate
polygalacturonic acid
solution pH
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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