Application of an Electrokinetic Formulation to the Study of the Effect of Alkaline-earth Cations on the Absorption of K+-ions by Lemna minor

A double effect of Ca++ is observed on K+-absorption by Lemna minor: activation through coupled (probably metabolic) processes, and inhibition through a perturbation of the structure of the catalytical sites of K+-absorption. In contrast, Mg++, which also exhibits a structural inhibitory effect, has...

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Bibliographic Details
Published in:Annals of botany 1974-06, Vol.38 (3), p.677-696
Main Authors: AYADI, A., STELZ, T., MONNIER, A., LASSALLES, J. P., THELLIER, M.
Format: Article
Language:English
Subjects:
Barley
Calcium
Calcium metabolism
Electrokinetics
Ions
Kinetics
Magnesium
Potassium
Thermodynamics
Velocity
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Summary:A double effect of Ca++ is observed on K+-absorption by Lemna minor: activation through coupled (probably metabolic) processes, and inhibition through a perturbation of the structure of the catalytical sites of K+-absorption. In contrast, Mg++, which also exhibits a structural inhibitory effect, has not apparently a metabolic actrvatory one. It seems that diffusive processes could account partly for the second phase of the dual-phase curves of absorption.
ISSN:0305-7364
1095-8290
DOI:10.1093/oxfordjournals.aob.a084855