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A study of the dynamics of K42 uptake by sunflower plants with the aid of a scintillation count-rate meter

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Summary

The time sequential mechanism of K42 uptake by sunflower plants from an osmotic pressure series of K42 HCO3 solutions was analyzed with the aid of a localizing scintillation count-rate meter. A range of osmotic pressures from 0.3 to 28.2 atm was selected.

Three phases of potassium uptake could be distinguished; an initial, exponential, rapid uptake; a period of saturation; a final phase, of renewed rapid uptake. Solutions with osmotic pressures of < 1.5 atm did not cause appreciable leaf scorching but tended to reduce uptake rates. An osmotic pressure of 7.6 atm resulted in a maximum potassium accumulation in the damaged leaves. All kinetic trends were reversed at 28.2 atm, causing rapid death by dessication. Plasmolytic effects of potassium were discussed in view of uptake stimulation.

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Author notes

  1. Herbert Jonas

    Present address: Cancer Research Laboratory, The Medical School, The University of Virginia, Charlottesville, Virginia, USA

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    1. Herbert Jonas
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    This work was undertaken while the author was a Postdoctoral fellow of the National Research Council in conjunction with the U.S. Atomic Energy Commission.

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    Jonas, H. A study of the dynamics of K42 uptake by sunflower plants with the aid of a scintillation count-rate meter. Protoplasma 47, 67–76 (1956). https://doi.org/10.1007/BF01252436

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    • DOI: https://doi.org/10.1007/BF01252436

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