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The Interaction of pH and Aeration in CI Uptake by Barley Roots
Author(s) -
JACOBSON L.,
COOPER B. R.,
VOLZ M. G.
Publication year - 1971
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1971.tb01469.x
Subject(s) - aeration , hordeum vulgare , chemistry , diffusion , hordeum , agronomy , poaceae , biology , organic chemistry , physics , thermodynamics
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 CO 2 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.