NDLI: Barrier function of the cell wall during uptake of nickel ions

Content Provider	Springer Nature Link
Author	Meychik, N. R. Nikolaeva, Yu. I. Komarynets, O. V. Ermakov, I. P.
Copyright Year	2011
Abstract	Cell walls were isolated from roots of six plant species to study their ion-exchange capacity for nickel ions (S $_{Ni}$) at Ni$^{2+}$ concentration of 10$^{−3}$ M. The S $_{Ni}$ values varied depending on the plant species from 50 to 150 μmol Ni$^{2+}$ 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 Ni$^{2+}$ 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 Ni$^{2+}$. It is concluded that the presence of 10$^{−3}$ M EDTA weakens the defense properties of cell walls. The sequestration of Ni$^{2+}$ 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.
Starting Page	409
Ending Page	414
Page Count	6
File Format	PDF
ISSN	10214437
Journal	Russian Journal of Plant Physiology
Volume Number	58
Issue Number	3
e-ISSN	16083407
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-05-03
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	higher plants cell walls nickel ions carboxyl groups EDTA Plant Physiology Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Plant Science

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