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Studies on Abscission: The Inhibiting Effect of Auxin

R. H. Wetmore and Wm. P. Jacobs
American Journal of Botany
Vol. 40, No. 4 (Apr., 1953), pp. 272-276
Stable URL: http://www.jstor.org/stable/2438666
Page Count: 5
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Studies on Abscission: The Inhibiting Effect of Auxin
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Abstract

The anatomy and physiology of the development of the abscission layer in Coleus leaves has been investigated. The abscission layer is firstapparent, and is almost fully differentiated anatomically, in leaf pair 3. The pre-abscission interval, of leaves at various positions along the stem (and thus of varying ages) shows a significant correlation with the amount of diffusible auxin produced by the leaves. Removing the leaf blades (and thus the auxin-sources) speeds up abscission very markedly. The leaf blades can be replaced in their inhibiting effect on abscission by the application of synthetic auxin. The experiments are interpreted as showing the dominant role of diffusible auxin from the leaf blades in controlling the normal order and intervals of leaf abscission.

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