Plant Cell Huazhong Agricultural University
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First published online May 26, 2009; 10.1105/tpc.109.066969

The Plant Cell 21:1328-1339 (2009)
© 2009 American Society of Plant Biologists

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REVIEW

The Angiosperm Gibberellin-GID1-DELLA Growth Regulatory Mechanism: How an "Inhibitor of an Inhibitor" Enables Flexible Response to Fluctuating Environments

Nicholas P. Harberd1, Eric Belfield and Yuki Yasumura

Department of Plant Sciences, University of Oxford, Oxford OX1 3RB, United Kingdom

1 Address correspondence to nicholas.harberd{at}plants.ox.ac.uk.

ABSTRACT

The phytohormone gibberellin (GA) has long been known to regulate the growth, development, and life cycle progression of flowering plants. However, the molecular GA-GID1-DELLA mechanism that enables plants to respond to GA has only recently been discovered. In addition, studies published in the last few years have highlighted previously unsuspected roles for the GA-GID1-DELLA mechanism in regulating growth response to environmental variables. Here, we review these advances within a general plant biology context and speculate on the answers to some remaining questions. We also discuss the hypothesis that the GA-GID1-DELLA mechanism enables flowering plants to maintain transient growth arrest, giving them the flexibility to survive periods of adversity.






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