Probable transcriptional regulator that acts as a repressor of the gibberellin (GA) signaling pathway. Probably acts by participating in large multiprotein complexes that repress transcription of GA-inducible genes. Upon GA application, it is degraded by the proteasome, allowing the GA signaling pathway. In contrast, its overexpression prevents the GA signaling pathway and induces a dwarf phenotype. The DELLA motif is required for its GA-induced degradation. Belongs to the GRAS family. DELLA subfamily.