Circadian oscillations of cytosolic and chloroplastic free calcium in plants.

  title={Circadian oscillations of cytosolic and chloroplastic free calcium in plants.},
  author={Carl Hirschie Johnson and Marc R. Knight and Takao Kondo and Patrick Masson and John C Sedbrook and Andrea D Haley and Anthony R Trewavas},
  volume={269 5232},
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… CONTINUE READING
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