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Signs of the time: environmental input to the circadian clock.
- Source :
-
Journal of experimental botany [J Exp Bot] 2002 Jul; Vol. 53 (374), pp. 1535-50. - Publication Year :
- 2002
-
Abstract
- The circadian clock forms one of the most fascinating adaptations to life on earth. Organisms can not only anticipate the day/night cycle but can make use of an internal clock to measure daylength as an indicator of the changing of the seasons. The innate period of the clock is not exactly equal to 24 h, but is reset each day by environmental signals at dawn and dusk, most notably by changes in light and temperature. This ability to re-entrain also ensures that the clock is synchronized with the day/night cycle which in turn is crucial for anticipation of dawn and dusk. Recent advances in the field have identified the photoreceptors involved in resetting the clock in several systems. This has revealed surprising similarities, but also key differences in the circadian systems of plants, fungi, insects, and mammals. One recurring feature emerging from this research is that the photoreceptors themselves are under the control of the clock with transcript abundance being tightly regulated. Furthermore, elements of a feedback pathway whereby the clock modulates the activity of the light input pathway are now being identified.
- Subjects :
- Animals
Cryptochromes
Flavoproteins physiology
Fungi physiology
Fungi radiation effects
Gene Expression Regulation, Plant radiation effects
Insecta physiology
Insecta radiation effects
Light
Photoreceptor Cells physiology
Photoreceptor Cells, Vertebrate physiology
Photoreceptors, Microbial physiology
Photosynthetic Reaction Center Complex Proteins metabolism
Phytochrome physiology
Phytochrome B
Plant Development
Plants genetics
Receptors, G-Protein-Coupled
Temperature
Circadian Rhythm physiology
Drosophila Proteins
Eye Proteins
Photoreceptor Cells, Invertebrate
Plants radiation effects
Transcription Factors
Subjects
Details
- Language :
- English
- ISSN :
- 0022-0957
- Volume :
- 53
- Issue :
- 374
- Database :
- MEDLINE
- Journal :
- Journal of experimental botany
- Publication Type :
- Academic Journal
- Accession number :
- 12096092
- Full Text :
- https://doi.org/10.1093/jxb/erf024