Abstract
The rice SLR1 gene is an ortholog of ArabidopsisGA1 and RGA, which function as negative regulators of gibberellin (GA) signal transduction. Genetic, physiological and biochemical analyses have revealed that the SLR1 protein, which is localized in the nucleus, is degraded by an upstream GA signal to induce the downstream GA actions. In other words, SLR1 suppresses GA activity and the GA-dependent degradation of the SLR1 protein releases SLR1-suppressed GA action. We identified the link between SLR1 degradation and GA signaling when we were analyzing the rice GA-insensitivedwarf (GID2) mutant. The GID2 gene encodes a putative F-box protein that is a component of an SCF complex associated with protein degradation via the 26S proteasome. Biochemical analyses of SLR1 and GID2 suggest that the proteasome-dependent degradation of SLR1 is initiated by phosphorylatian of SLR1 and mediated by an SCF complex involving GID2. In this review, we propose a model for GA signal transduction in rice.
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