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Gibberellic acid (GA) controls a variety of biological processes in plants, including growth and development. The bioactive gibbrellins bind to the GA receptor GID1 enabling latter to interact with DELLa (SLR1 in rice) protein. In the absence of bioactive GA, DELLA act as a repressor of transcription factors such as of PIF (Phytochrome interacting factor proteins), JAZ (which regulates Jasmonic acid mediated transcription), BZR (which regulates Brassinosteroid induced regulation of transcription). It also transactivates others such as IDD (Intermediate domain) family of proteins. In the presence of bioactive gibberrelins GID1-GA-DELLA/SLR1 complex binds to the Fbox protein GID 2 leading to ubuiquitination of DELLA resulting in proteosomal degradation of the latter.
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