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Published on October 27, 2006; 10.1104/pp.106.087858

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Received August 2, 2006
Accepted October 17, 2006

Ethylene Stimulates Nutations that are Dependent on the ETR1 Receptor

Brad M. Binder *, Ronan C. O'Malley , Wuyi Wang , Tobias C. Zutz , and Anthony B. Bleecker

Department of Botany, Birge Hall, University of Wisconsin-Madison, 430 Lincoln Drive, Madison, WI 53706

* Corresponding author; email: bmbinder{at}wisc.edu.

Ethylene influences a number of processes in Arabidopsis through the action of five receptors. In this study we used high-resolution, time-lapse imaging to examine the long-term effects of ethylene on growing, etiolated Arabidopsis seedlings. These measurements revealed that ethylene stimulates nutations of the hypocotyls with an average delay in onset of over 6 h. The nutation response was constitutive in ctr1-2 mutants maintained in air while ein2-1 mutants failed to nutate when treated with ethylene. Ethylene-stimulated nutations were also eliminated in etr1-7 loss-of-function mutants. Transformation of the etr1-7 mutant with a wild-type genomic ETR1 transgene rescued the nutation phenotype further supporting a requirement for ETR1. Loss-of-function mutations in the other receptor isoforms had no effect on ethylene-stimulated nutations. However, the double ers1-2 ers2-3 and triple etr2-3 ers2-3 ein4-4 loss-of-function mutants constitutively nutated in air. These results support a model where all the receptors are involved in ethylene-stimulated nutations but the ETR1 receptor is required and has a contrasting role from the other receptor isoforms in this nutation phenotype. NPA eliminated ethylene-stimulated nutations but had no effect on growth inhibition caused by ethylene pointing to a role for auxin transport in the nutation phenotype.




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E. P. Spalding
The Contributions of Anthony B. Bleecker to Ethylene Signaling and Beyond
PLANT CELL, December 1, 2006; 18(12): 3347 - 3349.
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