INTERACTIONS IN THE POTASSIUM AND SODIUM ABSORPTION BY INTACT MAIZE SEEDLINGS

The relation between the rate of K-and Na-absorption by maize seedlings in water culture and the concentration of these elements in the solution was investigated in a series of experiments. Na-absorption appeared to be strongly inhibited by excess K, but only part of the K-absorption was inhibited b...

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Bibliographic Details
Published in:Plant and soil 1959-06, Vol.11 (1), p.17-29
Main Author: BANGE, G. G. J.
Format: Article
Language:English
Subjects:
Alkalies
Barley
Cations
Corn
Kinetics
Plant roots
Plants
Potassium
Seedlings
Sodium
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Summary:The relation between the rate of K-and Na-absorption by maize seedlings in water culture and the concentration of these elements in the solution was investigated in a series of experiments. Na-absorption appeared to be strongly inhibited by excess K, but only part of the K-absorption was inhibited by excess Na. These results are interpreted in terms of the carrier hypothesis. Two carriers are thought to be operative: 1. a highly selective carrier A transporting K only and hardly affected by excess Na (Michaelis-Menten constant = ab. 0.002 me/1); 2. a hardly selective carrier B transporting both K and Na (Michaelis-Menten constant = ab. 0.2 me/1).
ISSN:0032-079X
1573-5036
DOI:10.1007/BF01394750