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Free Content Phytochrome-hormonal signalling networks

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• Summary    449

• Introduction    449

• The phytochrome protein  450

• Bacteriophytochromes   450

• I Bacteriophytochrome signalling  450

• Plant phytochrome signalling  451

• Ethylene perception and signalling  451

• Cytokinin perception and signalling 452

• Brassinosteroid perception and signalling  453

• Gibberellin signalling   455

• Auxin signalling   456

• Proteolysis in light and hormonal signalling  458

• Conclusion    459

• Acknowledgements   459

• References    459

Summary Through time, plants have evolved an extraordinary ability to interpret environmental cues. One of the most reliable of these cues is light, and plants are particularly adept at sensing and translating environmental light signals. The phytochrome family of photoreceptors monitor cues such as daylength or vegetative shade and adjust development to reflect change in these parameters. Indeed, it is their ability to coordinate these complex developmental changes that underpins the remarkable success of plants. Evidence is mounting that hormones control many of these light-mediated changes. Therefore, if we are to understand how light manipulates development we need to explore the interplay between light and hormonal signalling. Toward this goal, this review highlights the known convergence points of the phytochrome and the hormonal networks and explores their interactions.
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Keywords: Arabidopsis; GA; auxin; brassinosteroid; cytokinin; ethylene; gibberellin; hormones

Document Type: Research Article

Affiliations: 1: School of Biological Sciences, University of Bristol, Woodland Road, Bristol BS8 1UG, UK; 2: Department of Molecular Biology, Université de Genève, 30 quai E. Ansermet, CH-1211 Geneva 4, Switzerland

Publication date: 2003-03-01

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