RGA — Arabidopsis thaliana

Summary

AT2G01570, designated RGA (REPRESSOR OF GA1-3 1) in Arabidopsis thaliana, encodes a DELLA-domain GRAS family transcription regulator. The protein possesses gibberellin-binding, phytochrome-binding, and transcription corepressor-binding activities. RGA is associated with the downregulation of leaf development and vegetative growth, regulation of shade avoidance, inhibition of trichome spacing, and regulation of plant organ formation timing. It has been linked to diverse traits including leaf length-to-width ratio, seedling cotyledon number, tiller angle, seed volume, germination ratio, drought recovery, flower diameter, and copper sensitivity. The protein localizes to nuclear bodies, the SCF complex, plastids, and plasmodesmata, and participates in gibberellin signaling pathways including GA-GID1 complex transport and PIF-regulated transcription. Studies of related genes in other species link the family to plant height, fruit ripening, grain yield, and drought tolerance.