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The epidermis of the pea epicotyl is not a unique target tissue for auxin-induced growthPrevious 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.
Document ID
20040090059
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Rayle, D. L.
(San Diego State University California 92182, United States)
Nowbar, S.
Cleland, R. E.
Date Acquired
August 21, 2013
Publication Date
January 1, 1991
Publication Information
Publication: Plant physiology
Volume: 97
ISSN: 0032-0889
Subject Category
Life Sciences (General)
Distribution Limits
Public
Copyright
Other
Keywords
Non-NASA Center
NASA Discipline Number 40-50
NASA Program Space Biology
NASA Discipline Plant Biology

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