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Curr Opin Plant Biol. 2010 Feb;13(1):83-9. doi: 10.1016/j.pbi.2009.09.007. Epub 2009 Oct 14.

Arabidopsis circadian clock and photoperiodism: time to think about location.

Author information

1
Department of Biology, University of Washington, 24 Kincaid Hall, Box 351800, Seattle, WA 98195-1800, USA. takato@u.washington.edu

Abstract

Plants possess a circadian clock that enables them to coordinate internal biological events with external daily changes. Recent studies in Arabidopsis revealed that tissue-specific clock components exist and that the clock network architecture also varies within different organs. These findings indicate that the makeup of circadian clock(s) within a plant is quite variable. Plants utilize the circadian clock to measure day-length changes for regulating seasonal responses, such as flowering. To ensure that flowering occurs under optimum conditions, the clock regulates diurnal CONSTANS (CO) expression. Subsequently, CO protein induces FLOWERING LOCUS T (FT) expression which leads to flowering. It is emerging that both CO and FT expression are intricately controlled by groups of transcription factors with overlapping functions.

PMID:
19836294
PMCID:
PMC2818179
DOI:
10.1016/j.pbi.2009.09.007
[Indexed for MEDLINE]
Free PMC Article

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