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Effect of Cyanide on Rate of Exudation in Excised Onion Roots

Hilda F. Rosene
American Journal of Botany
Vol. 31, No. 3 (Mar., 1944), pp. 172-174
Stable URL: http://www.jstor.org/stable/2437640
Page Count: 3
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Effect of Cyanide on Rate of Exudation in Excised Onion Roots
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Abstract

When cyanide-free solutions surrounding onion roots (Allium cepa) were replaced by concentrations of .01, .005, .0025, or .001 molar KCN, the rate of exudation fell gradually to an inhibition level. The inhibition level was higher with lower concentrations of cyanide. Percentage inhibition was greater when the initial cyanide-free rate of exudation was higher. Evidence from the experiments on exudation and on oxygen consumption favors the hypothesis that there are gland-like tissues in roots that are actively engaged in water transfer.

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