Aug 1, 1981

A model for predicting ionic equilibrium concentrations in cell walls

Plant Physiology
H Sentenac, C Grignon


Purified cell walls were prepared from roots of Horse bean (Vicia faba L., var. minor) and Yellow Lupine (Lupinus luteus L.). Two methods were used: (a) grinding and (b) lysis of the endocellular contents by Triton X-100. The Ca(2+), Mg(2+), and K(+) contents were determined after incubation in various solutions in such a manner that the measurements gave access to the undisturbed equilibrium contents. The results were used to test a model which describes the ionic atmosphere in the cell walls as a result of simultaneous electrostatic interactions between free ions (Donnan effect) and specific association equilibria, including acido-basic ones. This model correctly accounted for the whole set of experimental results and predicted the values of the unmeasurable local concentrations and pH.

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Mentioned in this Paper

Pathologic Cytolysis
Lupinus luteus
Cell Wall
Canavalia ensiformis
Vicia faba
Triton X-100

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