The Molecular Basis of Temperature Compensation in the Arabidopsis Circadian Clock
| Autor: | Andrew J. Millar, Seth J. Davis, Raechel Milich, Megan M Southern, Anthony Hall, Camille Larue, James C. W. Locke, Joanna Putterill, Shigeru Hanano, Peter D. Gould, Richard Moyle |
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| Přispěvatelé: | University of Warwick [Coventry], School of Biological Sciences, University of Liverpool, University of Liverpool, University of Auckland [Auckland] |
| Jazyk: | angličtina |
| Rok vydání: | 2006 |
| Předmět: |
0106 biological sciences
Acclimatization Circadian clock Mutant TOC1 Arabidopsis Plant Science Models Biological 01 natural sciences 03 medical and health sciences Gene Expression Regulation Plant Transcription (biology) Botany Gene expression [SDV.BV]Life Sciences [q-bio]/Vegetal Biology Circadian rhythm Research Articles 030304 developmental biology Feedback Physiological 0303 health sciences biology Arabidopsis Proteins Temperature Gigantea food and beverages Cell Biology biology.organism_classification Circadian Rhythm Cell biology DNA-Binding Proteins Plant Leaves human activities Transcription Factors 010606 plant biology & botany |
| Zdroj: | The Plant cell The Plant cell, American Society of Plant Biologists (ASPB), 2006, 18 (5), pp.1177-1187. ⟨10.1105/tpc.105.039990⟩ Plant Cell |
| ISSN: | 1040-4651 1532-298X |
| DOI: | 10.1105/tpc.105.039990⟩ |
| Popis: | Circadian clocks maintain robust and accurate timing over a broad range of physiological temperatures, a characteristic termed temperature compensation. In Arabidopsis thaliana, ambient temperature affects the rhythmic accumulation of transcripts encoding the clock components TIMING OF CAB EXPRESSION1 (TOC1), GIGANTEA (GI), and the partially redundant genes CIRCADIAN CLOCK ASSOCIATED1 (CCA1) and LATE ELONGATED HYPOCOTYL (LHY). The amplitude and peak levels increase for TOC1 and GI RNA rhythms as the temperature increases (from 17 to 27°C), whereas they decrease for LHY. However, as temperatures decrease (from 17 to 12°C), CCA1 and LHY RNA rhythms increase in amplitude and peak expression level. At 27°C, a dynamic balance between GI and LHY allows temperature compensation in wild-type plants, but circadian function is impaired in lhy and gi mutant plants. However, at 12°C, CCA1 has more effect on the buffering mechanism than LHY, as the cca1 and gi mutations impair circadian rhythms more than lhy at the lower temperature. At 17°C, GI is apparently dispensable for free-running circadian rhythms, although partial GI function can affect circadian period. Numerical simulations using the interlocking-loop model show that balancing LHY/CCA1 function against GI and other evening-expressed genes can largely account for temperature compensation in wild-type plants and the temperature-specific phenotypes of gi mutants. |
| Databáze: | OpenAIRE |
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