FLOWERING LOCUS C-dependent and -independent regulation of the circadian clock by the autonomous and vernalization pathways
- Univ. of Warwick, Coventry (United Kingdom). Dept. of Biological Sciences; Harvard Univ., Cambridge, MA (United States). Bauer Center for Genomics Research
- Univ. of Warwick, Coventry (United Kingdom). Dept. of Biological Sciences; Max Planck Inst. for Plant Breeding Research, Cologne (Germany). Dept. fo Plant Developmental Biology
- Warwick HRI, Wellesbourne, Warwick (United Kingdom)
- Univ. of Wisconsin, Madison, WI (United States). Dept. of Biochemistry; Indiana Univ., Bloomington, IN (United States). Dept. of Biology
- Univ. of Wisconsin, Madison, WI (United States). Dept. of Biochemistry
- Univ. of Warwick, Coventry (United Kingdom). Dept. of Biological Sciences; Univ. of Edinburgh, Scotland (United Kingdom). School of Biological Sciences
Background: The circadian system drives pervasive biological rhythms in plants. Circadian clocks integrate endogenous timing information with environmental signals, in order to match rhythmic outputs to the local day/night cycle. Multiple signaling pathways affect the circadian system, in ways that are likely to be adaptively significant. Our previous studies of natural genetic variation in Arabidopsis thaliana accessions implicated FLOWERING LOCUS C (FLC) as a circadian-clock regulator. The MADS-box transcription factor FLC is best known as a regulator of flowering time. Its activity is regulated by many regulatory genes in the "autonomous" and vernalization-dependent flowering pathways. We tested whether these same pathways affect the circadian system. Results: Genes in the autonomous flowering pathway, including FLC, were found to regulate circadian period in Arabidopsis. The mechanisms involved are similar, but not identical, to the control of flowering time. By mutant analyses, we demonstrate a graded effect of FLC expression upon circadian period. Related MADS-box genes had less effect on clock function. We also reveal an unexpected vernalization-dependent alteration of periodicity. Conclusion: This study has aided in the understanding of FLC's role in the clock, as it reveals that the network affecting circadian timing is partially overlapping with the floral-regulatory network. We also show a link between vernalization and circadian period. This finding may be of ecological relevance for developmental programing in other plant species.
- Research Organization:
- Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division; National Science Foundation (NSF)
- Grant/Contract Number:
- 0133663; 0209786
- OSTI ID:
- 1626506
- Journal Information:
- BMC Plant Biology, Vol. 6, Issue 1; ISSN 1471-2229
- Publisher:
- BioMed CentralCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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