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

Autor:	M. G. Volz, B. R. Cooper, Louis Jacobson
Rok vydání:	1971
Předmět:	High rate Root surface Chromatography Physiology Chemistry Diffusion Cell Biology Plant Science General Medicine Ph changes Genetics Hordeum vulgare Aeration rate Aeration Nuclear chemistry
Zdroj:	Physiologia Plantarum. 25:432-435
ISSN:	1399-3054 0031-9317
DOI:	10.1111/j.1399-3054.1971.tb01469.x
Popis:	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.
Databáze:	OpenAIRE
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