title: Circadian and diurnal calcium oscillations encode photoperiodic information in Arabidopsis.
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.
authors.affiliation: Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, UK.
authors.forename: John
authors.initials: J
authors.lastname: Love
authors.forename: Antony N
authors.initials: AN
authors.lastname: Dodd
authors.forename: Alex A R
authors.initials: AA
authors.lastname: Webb
mesh_terms: D000331:Aequorin / Q000235:genetics; D001059:Apoproteins / Q000235:genetics; D017360:Arabidopsis / Q000235:genetics / Q000254:growth & development / Q000378:metabolism* / Q000528:radiation effects; D020013:Calcium Signaling; D002940:Circadian Rhythm; D018548:Cotyledon / Q000378:metabolism; D017440:Photoperiod; D018515:Plant Leaves / Q000378:metabolism; D030821:Plants, Genetically Modified; D011994:Recombinant Proteins / Q000235:genetics
chemical_list: D001059:Apoproteins; D011994:Recombinant Proteins; C060014:apoaequorin; D000331:Aequorin