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The Plant Cell 19:3317

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IN BRIEF

Circadian Regulation of Cytosolic Ca2+

Nancy A. Eckardt

News and Reviews Editor

neckardt{at}aspb.org

Cytosolic free Ca2+ [Ca2+]cyt shows circadian oscillations in plants, which might play a role in clock control of circadian rhythms of various processes, such as photosynthesis and photoperiodic control of flowering. Xu et al. (pages 3474–3490) undertook an extensive analysis of circadian [Ca2+]cyt oscillations under a variety of light/dark conditions in a number of Arabidopsis photoreceptor and circadian clock mutants carrying the bioluminescent Ca2+ reporter aequorin. The results showed that the circadian oscillation of [Ca2+]cyt in Arabidopsis is regulated by red and blue light through CRY1, CRY2, PHYB, and, possibly, PHYA. They further suggest a role for PHYB in cooperation with CRY1 and/or CRY2 in blue light signaling that regulates the amplitude of clock-controlled [Ca2+]cyt oscillations.

Experiments with various circadian clock mutants expressing the reporter gene CAB2:luciferase and aequorin suggested that (1) [Ca2+]cyt oscillations function as output, rather than input, of the circadian system, and light input into the oscillator controlling [Ca2+]cyt rhythms is gated by ELF3, and (2) multiple circadian oscillators are present that may be located in different cell types. In the toc1-1 mutant, the period of the [Ca2+]cyt (35S:AEQ) rhythm is unaltered, but the CAB2:luc period is shortened (see figure), suggesting the presence of multiple circadian oscillators.


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Footnotes

www.plantcell.org/cgi/doi/10.1105/tpc.107.191110


Related articles in Plant Cell:

Distinct Light and Clock Modulation of Cytosolic Free Ca2+ Oscillations and Rhythmic CHLOROPHYLL A/B BINDING PROTEIN2 Promoter Activity in Arabidopsis
Xiaodong Xu, Carlos T. Hotta, Antony N. Dodd, John Love, Robert Sharrock, Young Wha Lee, Qiguang Xie, Carl H. Johnson, and Alex A.R. Webb
Plant Cell 2007 19: 3474-3490. [Abstract] [Full Text]  




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