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JXB Advance Access published online on July 25, 2005
Journal of Experimental Botany, doi:10.1093/jxb/eri234
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© The Author [2005]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oupjournals.org
Received May 12, 2005
Accepted May 25, 2005

RESEARCH PAPER

The Arabidopsis mutant eer2 has enhanced ethylene responses in the light

Annelies De Paepe 1, Liesbeth De Grauwe 2, Sophie Bertrand 3, Jan Smalle 4, and Dominique Van Der Straeten 2*

1 Unit Plant Hormone Signaling and Bio-imaging, Department of Molecular Genetics, Ghent University, KL Ledeganckstraat 35, B-9000 Gent, Belgium; Present address: Department of Plant Systems Biology, Ghent University, Flanders Interuniversity Institute for Biotechnology (VIB), Technology Park 927, B-9052 Belgium
2 Unit Plant Hormone Signaling and Bio-imaging, Department of Molecular Genetics, Ghent University, KL Ledeganckstraat 35, B-9000 Gent, Belgium
3 Unit Plant Hormone Signaling and Bio-imaging, Department of Molecular Genetics, Ghent University, KL Ledeganckstraat 35, B-9000 Gent, Belgium; Present address: Wetenschappelijk Instituut Volksgezondheid Louis Pasteur, Centrum voor Bioveiligheid en Biotechnologie, Juliette Wytsmanstraat 14, B-1050 Brussels, Belgium
4 Unit Plant Hormone Signaling and Bio-imaging, Department of Molecular Genetics, Ghent University, KL Ledeganckstraat 35, B-9000 Gent, Belgium; Present address: Department of Agronomy, Kentucky University, 104A Kentucky Tobacco Research and Development Center 0236, Lexington, KY 40506, USA

* To whom correspondence should be addressed.
Dominique Van Der Straeten, E-mail: dominique.vanderstraeten{at}ugent.be


  Abstract

By screening for ethylene response mutants in Arabidopsis, a novel mutant, eer2, was isolated which displays enhanced ethylene responses. On a low nutrient medium (LNM) light-grown eer2 seedlings showed a significant hypocotyl elongation in response to low levels of 1-amino-cyclopropane-1-carboxylate (ACC), the precursor of ethylene, compared with the wild type, indicating that eer2 is hypersensitive to ethylene. Treatment with 1-MCP (1-methylcyclopropene), a competitive inhibitor of ethylene signalling, suppressed this hypersensitive response, demonstrating that it is a bona fide ethylene effect. By contrast, roots of eer2 were less sensitive than the wild type to low concentrations of ACC. The ethylene levels in eer2 did not differ from the wild type, indicating that ethylene overproduction is not the primary cause of the eer2 phenotype. In addition to its enhanced ethylene response of hypocotyls, eer2 is also affected in the pattern of senescence and its phenotype depends on the nutritional status of the growth medium. Furthermore, linkage analysis of eer2 suggests that this mutant defines a new locus in ethylene signalling.

Keywords: Arabidopsis; enhanced response; ethylene; hypocotyl; metal uptake; metal transport; senescence.
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