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Plant Physiol, October 2000, Vol. 124, pp. 609-614
Ethylene Induces Epidermal Cell Death at the Site of Adventitious
Root Emergence in Rice1
Heidi
Mergemann and
Margret
Sauter*
Institut für Allgemeine Botanik, Ohnhorststrasse 18, 22609 Hamburg, Germany
In deepwater rice (Oryza sativa), adventitious root
primordia initiate at the nodes as part of normal development.
Emergence of the roots is dependent on flooding of the plant and is
mediated by ethylene action. Root growth was preceded by the induced
death of epidermal cells of the node external to the tip of the root primordium. Cell death proceeded until the epidermis split open. Through this crack the root eventually emerged. Induced death was
confined to nodal epidermal cells covering the tip of the primordia.
Our results suggest that this process facilitates adventitious root
emergence and prevents injury to the growing root. Cell death was
inducible not only by submergence but also by application of
1-aminocyclopropane-1-carboxylic acid, the natural precursor of
ethylene and it was suppressed in the presence of 2,5-norbornadiene (bicyclo[2.2.1]hepta-2,5-diene), an inhibitor of ethylene action. Adventitious root growth and epidermal cell death are therefore linked
to the ethylene signaling pathway, which is activated in response to
low oxygen stress.
1
This work was supported by a grant from the
Arthur and Aenne Feindt Foundation.
*
Corresponding author; e-mail msauter{at}botanik.uni-hamburg.de;
fax 49-40-42816-229.
© 2000 American Society of Plant Physiologists
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