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The nuclear protein DET1 is a central repressor of
photomorphogenesis in plants. We have identified the molecular lesion
inted3, a mutation that dominantly suppresses the
phenotypes ofdet1-1. TED3 encodes a peroxisomal
protein (AtPex2p) essentialfor Arabidopsis growth.
Developmental defects and the abnormalexpression of many genes in
det1 are rescued by ted3. ted3 alsopartially suppresses another pleiotropic de-etiolated mutant
cop1.Thus, peroxisomes, whose functions are still largely
unexplored,play a key role in a photomorphogenetic pathway
negatively regulatedby the DET1 and COP proteins.
1 Plant Biology Laboratory,
2 Howard Hughes Medical Institute,
3 Laboratory of Neuronal Structure and Function, The
Salk Institute for Biological Studies, La Jolla, CA 92037, USA.
*
To whom correspondence should be addressed. E-mail:
chory{at}salk.edu
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