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The Epidermis of the Pea Epicotyl Is Not a Unique Target Tissue for Auxin-Induced Growth

David L. Rayle, Sogal Nowbar and Robert E. Cleland
Plant Physiology
Vol. 97, No. 1 (Sep., 1991), pp. 449-451
Stable URL: http://www.jstor.org/stable/4273848
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.
The Epidermis of the Pea Epicotyl Is Not a Unique Target Tissue for Auxin-Induced Growth
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Abstract

Previous research has suggested that the epidermis of dicotyledonous stems is the primary site of auxin action in elongation growth. We show for pea (Pisum sativum L.) epicotyl sections that this hypothesis is incorrect. In buffer (pH 6.5), sections from which the outer cell layers were removed (peeled) elongated slowly and to the same extent as intact sections. Addition of 10 micromolar indoleacetic acid to this incubation medium caused peeled sections to grow to the same extent and with the same kinetics as auxin-treated nonpeeled sections. This indicates that both epidermis and cortical tissues have the ability to respond rapidly to auxin and that the epidermis is not the sole site of auxin action in dicotyledonous stems. Previous reports that peeled pea sections respond poorly to auxin may have resulted from an acid extension of these sections due to the use of distilled water as the incubation medium.

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