Circadian oscillations of cytosolic and chloroplastic free calcium in plants.

Johnson CH, Knight MR, Kondo T, Masson P, Sedbrook J, Haley A, Trewavas A
Science. 1995 269 (5232): 1863-5

PMID: 7569925 · DOI:10.1126/science.7569925

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.

MeSH Terms (15)

Aequorin Apoproteins Arabidopsis Calcium Calcium-Binding Proteins Chloroplasts Circadian Rhythm Cytosol Darkness Light Luminescence Plants, Genetically Modified Plants, Toxic Recombinant Proteins Tobacco

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