Plant Cell Advance Online Publication Published on January 29, 2002; 10.1105/tpc.010319
Received July 31, 2001
Accepted October 1, 2001
Gibberellin Signaling Pathway Is Regulated by the Appearance and Disappearance of
SLENDER RICE1 in Nuclei
Hironori Itoh 1, Miyako Ueguchi-Tanaka 1, Yutaka Sato 1, Motoyuki Ashikari 1, and Makoto Matsuoka 1*
1
BioScience Center, Nagoya University, Chikusa, Nagoya 464-8601, Japan
* To whom correspondence should be addressed. E-mail: j45751a{at}nucc.cc.nagoya-u.ac.jp.
The slender rice1 mutant (slr1) shows a constitutive gibberellin
(GA) response phenotype. To investigate the mode of action of SLR1, we generated
transgenic rice expressing a fusion protein consisting of SLR1 and green fluorescent
protein (SLR1-GFP) and analyzed the phenotype of the transformants and the subcellular
localization of GFP in vivo. SLR1-GFP worked in nuclei to repress the GA signaling
pathway; its overproduction caused a dwarf phenotype. Application of GA
3 to SLR1-GFP overproducers induced GA actions such as shoot elongation, downregulation
of GA 20-oxidase expression, and upregulation of SLR1 expression
linked with the disappearance of the nuclear SLR1-GFP protein. We also performed
domain analyses of SLR1 using transgenic plants overproducing different kinds of
truncated SLR1 proteins. The analyses revealed that the SLR1 protein can be divided
into four parts: a GA signal perception domain located at the N terminus, a regulatory
domain for its repression activity, a dimer formation domain essential for signal
perception and repression activity, and a repression domain at the C terminus. We
conclude that GA signal transduction is regulated by the appearance or disappearance
of the nuclear SLR1 protein, which is controlled by the upstream GA signal.
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