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The Interaction of pH and Aeration in CI Uptake by Barley Roots (1971)

JACOBSON, L. ; COOPER, B. R. ; VOLZ, M. G.

Oxford, UK : Blackwell Publishing Ltd

Physiologia plantarum 25 (1971), S. 0

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ISSN: 1399-3054

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: The uptake of Cl by excised roots of barley (Hordeum vulgare L.) from KC1 solution maintained at high pH was markedly reduced by high rates of aeration, whereas K uptake was scarcely affected. Aeration rate had relatively minor effects at low pH. The effect of high aeration rate at pH 9 could be overcome by the use of buffered solutions. In unbuffered solutions the H resulting from the excess cation uptake together with that produced from respiratory CO2 was sufficient to materially reduce the pH of the solution. The reduction in pH favored the uptake of Cl which is adversely affected by high pH. The effect of aeration rate could be explained in terms of root induced pH changes and film diffusion involving the solution film adjacent to the root surface.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1399-3054.1971.tb01469.x

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A specific calcium requirement for potassium uptake by excised vetch roots (1974)

Volz, M. G. ; Jacobson, L.

Springer

Plant and soil 41 (1974), S. 647-659

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ISSN: 1573-5036

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Summary Compared to the behavior of excised barley roots, K uptake by excised roots of vetch was far more responsive to pH and required ambient Ca concentrations 100 fold higher to overcome the deleterious effect of low pH. At pH values above 7, however, the addition of very low concentrations of Ca markedly depressed the uptake of K by vetch roots, less so for barley. Potassium uptakes by vetch roots in the presence of Ca led to K being sequestered into a non-exchangeable form and this process was dependent upon aerobic metabolism. The degree of specificity for Ca appeared to be much higher for vetch roots than for barley roots. Some of the differences in response to Ca between vetch and barley may be related to the higher exchange capacity of vetch roots.