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Circadian oscillations of cytosolic free calcium regulate the Arabidopsis circadian clock

Martí Ruiz, María Carmen; Hubbard, Katharine E.; Gardner, Michael J.; Jung, Hyun Ju; Aubry, Sylvain; Hotta, Carlos T.; Mohd-Noh, Nur Izzati; Robertson, Fiona C.; Hearn, Timothy J.; Tsai, Yu-Chang; Dodd, Antony N.; Hannah, Matthew; Carré, Isabelle A.; Davies, Julia M.; Braam, Janet; Webb, Alex A.R.


María Carmen Martí Ruiz

Michael J. Gardner

Hyun Ju Jung

Sylvain Aubry

Carlos T. Hotta

Nur Izzati Mohd-Noh

Fiona C. Robertson

Timothy J. Hearn

Yu-Chang Tsai

Antony N. Dodd

Matthew Hannah

Isabelle A. Carré

Julia M. Davies

Janet Braam

Alex A.R. Webb


In the last decade, the view of circadian oscillators has expanded from transcriptional feedback to incorporate post-transcriptional, post-translational, metabolic processes and ionic signalling. In plants and animals, there are circadian oscillations in the concentration of cytosolic free Ca2+ ([Ca2+]cyt), though their purpose has not been fully characterized. We investigated whether circadian oscillations of [Ca2+]cyt regulate the circadian oscillator of Arabidopsis thaliana. We report that in Arabidopsis, [Ca2+]cyt circadian oscillations can regulate circadian clock function through the Ca2+-dependent action of CALMODULIN-LIKE24 (CML24). Genetic analyses demonstrate a linkage between CML24 and the circadian oscillator, through pathways involving the circadian oscillator gene TIMING OF CAB2 EXPRESSION1 (TOC1).


Martí Ruiz, M. C., Hubbard, K. E., Gardner, M. J., Jung, H. J., Aubry, S., Hotta, C. T., …Webb, A. A. (2018). Circadian oscillations of cytosolic free calcium regulate the Arabidopsis circadian clock. Nature Plants, 4(9), 690-698.

Journal Article Type Article
Acceptance Date Jul 17, 2018
Online Publication Date Aug 20, 2018
Publication Date Sep 1, 2018
Deposit Date Oct 3, 2018
Publicly Available Date Oct 27, 2022
Journal Nature Plants
Print ISSN 2055-0278
Electronic ISSN 2055-0278
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 4
Issue 9
Pages 690-698
Keywords Circadian rhythms in plants; Plant signalling
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