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Negative regulator of GA responses, member of GRAS family of transcription factors. Also belongs to the DELLA proteins that restrain the cell proliferation and expansion that drives plant growth. RGL1 may be involved in reducing ROS accumulation in response to stress by up-regulating the transcription of superoxide dismutases. Rapidly degraded in response to GA. Involved in flower and fruit development.
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.
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.