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Title: FLOWERING LOCUS C-dependent and -independent regulation of the circadian clock by the autonomous and vernalization pathways

Journal Article · · BMC Plant Biology
 [1];  [2];  [3];  [4];  [5];  [6]
  1. Univ. of Warwick, Coventry (United Kingdom). Dept. of Biological Sciences; Harvard Univ., Cambridge, MA (United States). Bauer Center for Genomics Research
  2. Univ. of Warwick, Coventry (United Kingdom). Dept. of Biological Sciences; Max Planck Inst. for Plant Breeding Research, Cologne (Germany). Dept. fo Plant Developmental Biology
  3. Warwick HRI, Wellesbourne, Warwick (United Kingdom)
  4. Univ. of Wisconsin, Madison, WI (United States). Dept. of Biochemistry; Indiana Univ., Bloomington, IN (United States). Dept. of Biology
  5. Univ. of Wisconsin, Madison, WI (United States). Dept. of Biochemistry
  6. 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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Vernalization‐induced repression of FLOWERING LOCUS C stimulates flowering in Sinapis alba and enhances plant responsiveness to photoperiod journal March 2008
A conserved molecular basis for photoperiod adaptation in two temperate legumes journal December 2012
Modulation of copper deficiency responses by diurnal and circadian rhythms in Arabidopsis thaliana journal October 2015
Time to flower: interplay between photoperiod and the circadian clock journal November 2014
Update on the genetic control of flowering in garden pea journal May 2009
The FLC-like gene BvFL1 is not a major regulator of vernalization response in biennial beets journal April 2014
Pleiotropy in developmental regulation by flowering‐pathway genes: is it an evolutionary constraint? journal June 2019
Under a New Light: Regulation of Light-Dependent Pathways by Non-coding RNAs journal July 2018
Fluctuating, warm temperatures decrease the effect of a key floral repressor on flowering time in Arabidopsis thaliana journal December 2015
Temperature perception and signal transduction in plants journal August 2008
Intermediate degrees of synergistic pleiotropy drive adaptive evolution in ecological time journal September 2017