Transport of Sodium in Plant Tissue

Two mechanisms are implicated in the absorption of alkali cations by barley roots. Mechanism 1 has a high affinity for potassium, but its affinity for sodium is so low that, in the presence of even a low concentration of potassium (1 mM), sodium absorption by this mechanism is all but abolished. Mec...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 1965-06, Vol.148 (3677), p.1611-1611
Main Authors: Rains, D. W., Epstein, Emanuel
Format: Article
Language:English
Subjects:
Alkalies
Barley
Medical research
Plant tissues
Potassium
Sodium
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Summary:Two mechanisms are implicated in the absorption of alkali cations by barley roots. Mechanism 1 has a high affinity for potassium, but its affinity for sodium is so low that, in the presence of even a low concentration of potassium (1 mM), sodium absorption by this mechanism is all but abolished. Mechanism 2 has a much lower affinity for alkali cations and is not highly selective; it transports sodium as well as potassium.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.148.3677.1611