It has been almost a century since biologically active gibberellin (GA) was isolated. Here, we give a historical overview of the early efforts in establishing the GA biosynthesis and catabolism pathway, characterizing the enzymes for GA metabolism, and elucidating their corresponding genes. We then highlight more recent studies that have identified the GA receptors and early GA signaling components (DELLA repressors and F-box activators), determined the molecular mechanism of DELLA-mediated transcription reprograming, and revealed how DELLAs integrate multiple signaling pathways to regulate plant vegetative and reproductive development in response to internal and external cues. Finally, we discuss the GA transporters and their roles in GA-mediated plant development.

Department of Biology Duke University Durham NC 27708 USA

Laboratory of Growth Regulators Institute of Experimental Botany and Palacky University 78371 Olomouc Czech Republic

School of Plant Sciences and Food Security Tel Aviv University Tel Aviv 69978 Israel

Sustainable Soils and Crops Rothamsted Research Harpenden AL5 2JQ UK

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