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/l);
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2.
a hardly selective carrier B transporting both K and Na (Michaelis-Menten constant = ab. 0.2 me/l).
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Bange, G.G.J. Interactions in the potassium and sodium absorption by intact maize seedlings. Plant Soil 11, 17–29 (1959). https://doi.org/10.1007/BF01394750
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DOI: https://doi.org/10.1007/BF01394750