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A model for cation content of plants based on surface potentials and surface charge densities of plant membranes
Author(s) -
Bérczi Alajos,
Møller Ian M.,
Oláh Zoltán,
Lundborg Tomas,
Erdei László
Publication year - 1984
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1984.tb05165.x
Subject(s) - membrane , ionic bonding , chemistry , surface charge , macromolecule , charge density , ionic strength , shoot , range (aeronautics) , analytical chemistry (journal) , chemical physics , ion , materials science , chromatography , botany , biochemistry , physics , biology , aqueous solution , organic chemistry , quantum mechanics , composite material
The model presented takes into account the interaction between the negatively charged membranes and macromolecules and the cations. A central postulate is that a constant average surface charge density (σ) as well as a constant average surface potential (Ψ) is conserved under different ionic conditions. The model makes it possible to predict the size of σ and Ψ from measurements of Na, K, Mg and Ca content in plant tissues of the same age but grown under two different ionic conditions (e.g. high and low K + ). Assumptions were made about the relative amounts of free and bound Ca 2+ and σ and Ψ were calculated from values in the literature. In all cases σ (and Ψ) are predicted to be higher for shoot (−29 to −96 mC m −2 ) than for root membranes (−14 to −27 mC m −2 ). In most cases the predicted σ falls within the range determined experimentally for biological membranes.