Circadian and diurnal calcium oscillations encode photoperiodic information in Arabidopsis |
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Authors: | Love John Dodd Antony N Webb Alex A R |
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Institution: | Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, UK. |
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Abstract: | 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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