Barrier function of the cell wall during uptake of nickel ions

Barrier function of the cell wall during uptake of nickel ions Cell walls were isolated from roots of six plant species to study their ion-exchange capacity for nickel ions (S Ni) at Ni2+ concentration of 10−3 M. The S Ni values varied depending on the plant species from 50 to 150 μmol Ni2+ per gram dry wt; the sorption capacity increased in a row: Poaceae < Chenopodiaceae < Fabaceae. At pH 5 the sorption capacity of cell walls for nickel ions was determined by the presence of carboxyl groups of polygalacturonic acid in the polymeric cell-wall matrix. In all cases the ion-exchange capacity of cell walls was higher at pH 8 than at pH 5, indicating that Ni2+ binds also to a carboxyl group different from that of polygalacturonic acid. Irrespective of plant species, the presence of EDTA in the solution diminished drastically the absorption capacity of cell walls for Ni2+. It is concluded that the presence of 10−3 M EDTA weakens the defense properties of cell walls. The sequestration of Ni2+ in the cell wall can be considered as an effective means of plant cell defense against elevated concentrations of nickel ions in the external medium. Russian Journal of Plant Physiology Springer Journals

Barrier function of the cell wall during uptake of nickel ions

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SP MAIK Nauka/Interperiodica
Copyright © 2011 by Pleiades Publishing, Ltd.
Life Sciences; Plant Physiology; Plant Sciences
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