Plant Physiology Preview Published on October 1, 2004; 10.1104/pp.104.050393
Received July 21, 2004
Returned for revision August 30, 2004
Accepted August 31, 2004
Short-Term Growth Responses to Ethylene in Arabidopsis Seedlings Are EIN3/EIL1 Independent
Brad M. Binder , Laura A. Mortimore , Anna N. Stepanova , Joseph R. Ecker , and Anthony B. Bleecker *
Department of Botany, University of Wisconsin, Madison, Wisconsin 53706
Department of Genetics, North Carolina State University, Raleigh, North Carolina 27695
Plant Biology Lab, The Salk Institute for Biological Sciences, La Jolla, California 92037
* Corresponding author; email: bleecker{at}wisc.edu.
Kinetic studies indicate there are two phases to growth inhibition by ethylene for the hypocotyls of etiolated Arabidopsis seedlings. Phase I is transient, while phase II results in sustained growth inhibition. The EIN2 membrane protein is required for both the first and second phases of growth inhibition by ethylene, while the transcription factors EIN3 and EIL1 are required for the second phase but not the first phase. The first phase lasts no more than 2 h. It is less sensitive to the ethylene response inhibitor 1-methylcyclopropene and more sensitive to ethylene than the second phase. The first phase shows adaptation at low concentrations of ethylene ( 0.01 µL L-1) with a relative refractory period of 5 h after ethylene is added. A modified signal transduction model is proposed that accounts for the two phases of growth inhibition.
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