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Science 22 June 1962:
Vol. 136. no. 3521, pp. 1051 - 1052
DOI: 10.1126/science.136.3521.1051
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Articles

Course of Cation Absorption by Plant Tissue

Emanuel Epstein 1, D. W. Rains 1, and Walter E. Schmid 1

1 Department of Soils and Plant Nutrition, University of California, Davis

The absorption of rubidium by excised barley roots from solutions containing calcium was a strictly linear function of time for 1 hour and was temperature-sensitive throughout; there was no evidence of an initial nonmetabolic exchange phase of uptake. The rubidium absorbed reached concentrations many times the external concentration without any slackening of the rate of absorption—evidence for a high degree of irreversibility of the overall absorption process. This is discussed in terms of the "enzyme-kinetic" model of ion transport by carriers.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Light-Enhanced Potassium Absorption by Corn Leaf Tissue.
D. W. Rains (1967)
Science 156, 1382-1383
   Abstract »    PDF »
Interpretation of Cation-Exchange Mechanisms.
P. S. Antal, E. Epstein, D. W. Rains, and W. E. Schmid (1962)
Science 138, 719-722
   PDF »


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Science. ISSN 0036-8075 (print), 1095-9203 (online)