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Circadian and Diurnal Calcium Oscillations Encode Photoperiodic Information in Arabidopsis

Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, United Kingdom

³ To whom correspondence should be addressed. E-mail alex.webb{at}plantsci.cam.ac.uk; fax 44 (0)1223 333953.

We have tested the hypothesis that circadian oscillations in the concentration of cytosolic free calcium ([Ca²⁺]_cyt) can encode information. We imaged oscillations of [Ca²⁺]_cyt in the cotyledons and leaves of Arabidopsis (Arabidopsis thaliana) that have a 24-h period in light/dark cycles and also constant light. The amplitude, phase, and shape of the oscillations of [Ca²⁺]_cyt and [Ca²⁺]_cyt at critical daily time points were controlled by the light/dark regimes in which the plants were grown. These data provide evidence that 24-h oscillations in [Ca²⁺]_cyt encode information concerning daylength and light intensity, which are two major regulators of plant growth and development.

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