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Distinct Light-Initiated Gene Expression and Cell Cycle Programs in the Shoot Apex and Cotyledons of Arabidopsis

Enrique López-Juez, Edyta Dillon, Zoltán Magyar, Safina Khan, Saul Hazeldine, Sarah M. de Jager, James A.H. Murray, Gerrit T.S. Beemster, László Bögre, Hugh Shanahan
Enrique López-Juez
School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United Kingdom
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Edyta Dillon
School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United Kingdom
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Zoltán Magyar
School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United KingdomInstitute of Plant Biology, Biological Research Center, H-6701 Szeged, Hungary
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Safina Khan
School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United Kingdom
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Saul Hazeldine
Department of Computer Science, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United Kingdom
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Sarah M. de Jager
Institute of Biotechnology, University of Cambridge, Cambridge CB2 1QT, United Kingdom
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James A.H. Murray
Institute of Biotechnology, University of Cambridge, Cambridge CB2 1QT, United Kingdom
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Gerrit T.S. Beemster
Department of Plant Systems Biology, Flanders Institute of Biotechnology, B-9052 Gent, BelgiumDepartment of Molecular Genetics, Gent University, B-9052 Gent, Belgium
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László Bögre
School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United Kingdom
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Hugh Shanahan
Department of Computer Science, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United Kingdom
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Published April 2008. DOI: https://doi.org/10.1105/tpc.107.057075

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Abstract

In darkness, shoot apex growth is repressed, but it becomes rapidly activated by light. We show that phytochromes and cryptochromes play largely redundant roles in this derepression in Arabidopsis thaliana. We examined the light activation of transcriptional changes in a finely resolved time course, comparing the shoot apex (meristem and leaf primordia) and the cotyledon and found >5700 differentially expressed genes. Early events specific to the shoot apices included the repression of genes for Really Interesting New Gene finger proteins and basic domain/leucine zipper and basic helix-loop-helix transcription factors. The downregulation of auxin and ethylene and the upregulation of cytokinin and gibberellin hormonal responses were also characteristic of shoot apices. In the apex, genes involved in ribosome biogenesis and protein translation were rapidly and synchronously induced, simultaneously with cell proliferation genes, preceding visible organ growth. Subsequently, the activation of signaling genes and transcriptional signatures of cell wall expansion, turgor generation, and plastid biogenesis were apparent. Furthermore, light regulates the forms and protein levels of two transcription factors with opposing functions in cell proliferation, E2FB and E2FC, through the Constitutively Photomorphogenic1 (COP1), COP9-Signalosome5, and Deetiolated1 light signaling molecules. These data provide the basis for reconstruction of the regulatory networks for light-regulated meristem, leaf, and cotyledon development.

  • Received November 21, 2007.
  • Revised February 19, 2008.
  • Accepted March 24, 2008.
  • Published April 18, 2008.
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Distinct Light-Initiated Gene Expression and Cell Cycle Programs in the Shoot Apex and Cotyledons of Arabidopsis
Enrique López-Juez, Edyta Dillon, Zoltán Magyar, Safina Khan, Saul Hazeldine, Sarah M. de Jager, James A.H. Murray, Gerrit T.S. Beemster, László Bögre, Hugh Shanahan
The Plant Cell Apr 2008, 20 (4) 947-968; DOI: 10.1105/tpc.107.057075

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Distinct Light-Initiated Gene Expression and Cell Cycle Programs in the Shoot Apex and Cotyledons of Arabidopsis
Enrique López-Juez, Edyta Dillon, Zoltán Magyar, Safina Khan, Saul Hazeldine, Sarah M. de Jager, James A.H. Murray, Gerrit T.S. Beemster, László Bögre, Hugh Shanahan
The Plant Cell Apr 2008, 20 (4) 947-968; DOI: 10.1105/tpc.107.057075
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The Plant Cell Online: 20 (4)
The Plant Cell
Vol. 20, Issue 4
April 2008
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