Gibberellin-GID1-DELLA: a pivotal regulatory module for plant growth and development.

The diterpenoid hormone GA controls diverse developmental processes throughout the life cycle of a plant. Physiological and genetic studies show that active GA promotes seed germination and vegetative growth. In some species, GA also induces flowering and regulates flower, fruit, and seed development. This article highlights recent advances in our understanding of the molecular mechanisms of GA metabolism, transport, perception, and signaling, and the regulatory circuit between the GA pathway and other pathways to control plant growth and development in response to internal and external cues.