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Science 29 September 1995:
Vol. 269. no. 5232, pp. 1863 - 1865
DOI: 10.1126/science.7569925
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Articles

Science, Vol 269, Issue 5232, 1863-1865
Copyright © 1995 by American Association for the Advancement of Science

articles

Circadian oscillations of cytosolic and chloroplastic free calcium in plants

CH Johnson, MR Knight, T Kondo, P Masson, J Sedbrook, A Haley, and A Trewavas

Department of Biology, Vanderbilt University, Nashville, TN 37235, USA.

Tobacco and Arabidopsis plants, expressing a transgene for the calcium-sensitive luminescent protein apoaequorin, revealed circadian oscillations in free cytosolic calcium that can be phase-shifted by light-dark signals. When apoaequorin was targeted to the chloroplast, circadian chloroplast calcium rhythms were likewise observed after transfer of the seedlings to constant darkness. Circadian oscillations in free calcium concentrations can be expected to control many calcium-dependent enzymes and processes accounting for circadian outputs. Regulation of calcium flux is therefore fundamental to the organization of circadian systems.


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