Probable transcriptional regulator that acts as a repressor of the gibberellin (GA) signaling pathway. No effect of the BOI proteins on its stability. Probably acts by participating in large multiprotein complexes that repress transcription of GA-inducible genes. Has overlapping but distinct roles in GA signaling compared to RGA and GAI. Regulates the floral development. May also participate in seed germination and in ovule and anther development. Its activity is probably regulated by other phytohormones such as auxin and ethylene. Interacts directly with the GID2/SLY1 component of the SCF(GID2) complex. Interacts (via N-terminus) with GID1A, GID1B and GID1B (via N-terminus). Interacts with the BOI proteins BOI, BRG1, BRG2 and BRG3. Binds to and coactivates GAF1/IDD2 and ENY/IDD1 (PubMed:25035403). Predominantly expressed in germinating seeds and flowers and siliques. Highly expressed in inflorescences and weakly or not expressed in rosette leaves, etiolated seedlings, siliques, mature stems and roots. RGA and GAI transcripts were detected at slightly varying levels in all tissues examined. RGL2 signal was undetected, and RGL3 signal was very weak in all tissues examined (rosette leaves, seedlings, inflorescences, and siliques) except inflorescences. In the flower, it is expressed in developing ovules as well as in developing anthers throughout microspore development. Not up-regulated upon GA treatment. Phosphorylated. May be ubiquitinated, as suggested by its interaction with GID2. Ubiquitination is however unsure since in contrast to other DELLA proteins, it is not ubiquitinated and degraded upon GA application. Nevertheless, ubiquitination may be triggered by other processes. Rga, gai, rgl1, rgl2 and rgl3 pentuple mutant displays constitutive GA responses even in the absence of GA treatment. Belongs to the GRAS family. DELLA subfamily. According to PubMed:11877383, it is not involved in seed germination.