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Published on January 7, 2009; 10.1104/pp.108.129973

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Received September 16, 2008
Accepted January 2, 2009

Constitutive Repression and Activation of Auxin Signaling in Arabidopsis

Hanbing Li , Yan Cheng , Angus Murphy , Gretchen Hagen , and Tom J. Guilfoyle *

Department of Biochemistry, 117 Schweitzer Hall, University of Missouri, Columbia, MO, 65211, USA; Department of Horticulture, Purdue University, West Lafayette, IN 47907, USA

* Corresponding author; email: Guilfoylet{at}missouri.edu.

Aux/IAA proteins are proposed to be transcriptional repressors that play a crucial role in auxin signaling by interacting with Auxin Response Factors (ARFs) and repressing early/primary auxin response gene expression. In assays with transfected protoplasts, this repression was previously shown to occur when auxin concentrations in a cell are low, and derepression/activation was observed when auxin concentrations are elevated. Here we show that a stabilized version of the Arabidopsis IAA17 repressor, when expressed constitutively or in a specific cell type in Arabidopsis plants, confers phenotypes similar to plants with decreased auxin levels. In contrast, a stabilized version of IAA17 that was converted to a transcriptional activator confers phenotypes similar to plants with increased auxin levels, when expressed under the same conditions in Arabidopsis plants. Free auxin levels were unchanged compared to control (DR5:GUS), however, in the seedlings expressing the IAA17 repressor and activator. These results together with our previous results carried out in transfected protoplasts suggest that the hormone auxin can be by-passed to regulate auxin signaling in a cell autonomous manner in plants.




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[Abstract] [Full Text] [PDF]


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