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First published online October 1, 2004; 10.1104/pp.104.050393

Plant Physiology 136:2921-2927 (2004)
© 2004 American Society of Plant Biologists

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Short-Term Growth Responses to Ethylene in Arabidopsis Seedlings Are EIN3/EIL1 Independent1

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 (B.M.B., L.A.M., A.B.B.); Department of Genetics, North Carolina State University, Raleigh, North Carolina 27695 (A.N.S.); and Plant Biology Lab, The Salk Institute for Biological Sciences, La Jolla, California 92037 (J.R.E.)

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.

1 This work was supported by grants from the U.S. Department of Agriculture-HATCH (grant no. WIS04531to A.B.B.), the American Floral Endowment, and the National Science Foundation (grant no. MCB–0131564).

Article, publication date, and citation information can be found at www.plantphysiol.org/cgi/doi/10.1104/pp.104.050393.

* Corresponding author; e-mail bleecker{at}wisc.edu; fax 608–262–7509.

Received July 21, 2004; returned for revision August 30, 2004; accepted August 31, 2004.




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