Circadian oscillations of cytosolic free calcium regulate the Arabidopsis circadian clock
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Abstract
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 characterised. 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).
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2055-0278
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Biotechnology and Biological Sciences Research Council (BB/D017904/1)
European Commission (272186)
Biotechnology and Biological Sciences Research Council (BB/M00113X/1)
Biotechnology and Biological Sciences Research Council (BB/M006212/1)
Biotechnology and Biological Sciences Research Council (BB/L02182X/1)
Biotechnology and Biological Sciences Research Council (BB/D010381/1)
Biotechnology and Biological Sciences Research Council (BB/H006826/1)