6 Gibberellin Hormone Signal Perception: Down-Regulating DELLA Repressors of Plant Growth and Development

Annual Plant Reviews book series, Volume 49: The Gibberellins
Sven K. Nelson

Sven K. Nelson

Molecular Plant Sciences Program, Washington State University, USA

Current address: USDA-ARS, Plant Genetic Research Unit, University of Missouri, USA

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Camille M. Steber

Camille M. Steber

Molecular Plant Sciences Program, Washington State University, USA

USDA-ARS, Wheat Health, Genetics, and Quality Unit, Pullman, WA, USA

Department of Crop and Soil Science, Washington State University, USA

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First published: 20 April 2018
Citations: 8
This article was originally published in 2016 in The Gibberellins, Volume 49 (ISBN 9781119210429) of the Annual Plant Reviews book series, this volume edited by Peter Hedden and Stephen G. Thomas. The article was republished in Annual Plant Reviews online in April 2018.

Abstract

The gibberellin (GA) hormone signal is perceived by a receptor with homology to hormone-sensitive lipases, GID1 (GA-INSENSITIVE DWARF1). This leads to GA-stimulated responses, including stem elongation, seed germination and the transition to flowering. GA-binding enables GID1 to interact with and block the function of the DELLA repressors of GA responses. DELLA repression can be blocked both by proteolytic and non-proteolytic mechanisms triggered by the formation of a GID1-GA-DELLA complex. DELLA is down-regulated by the SLEEPY1/GID2 F-box proteins via the ubiquitin-proteasome pathway, and can be regulated by other post-translational modifications. This chapter reviews the structural requirements for GA-binding by GID1 and for GID1-GA-DELLA protein complex formation, and reviews the current understanding of the mechanisms regulating DELLA repressors.

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