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Plants have circadian oscillations in the concentration of cytosolic free calcium ([Ca(2+)](cyt)). To dissect the circadian Ca(2+)-signaling network, we monitored circadian [Ca(2+)](cyt) oscillations under various light/dark conditions (including different spectra) in Arabidopsis thaliana wild type and photoreceptor and circadian clock mutants. Both red and blue light regulate circadian oscillations of [Ca(2+)](cyt). Red light signaling is mediated by PHYTOCHROME B (PHYB). Blue light signaling occurs through the redundant action of CRYPTOCHROME1 (CRY1) and CRY2. Blue light also increases the basal level of [Ca(2+)](cyt), and this response requires PHYB, CRY1, and CRY2. Light input into the oscillator controlling [Ca(2+)](cyt) rhythms is gated by EARLY FLOWERING3. Signals generated in the dark also regulate the circadian behavior of [Ca(2+)](cyt). Oscillations of [Ca(2+)](cyt) and CHLOROPHYLL A/B BINDING PROTEIN2 (CAB2) promoter activity are dependent on the rhythmic expression of LATE ELONGATED HYPOCOTYL and CIRCADIAN CLOCK-ASSOCIATED1, but [Ca(2+)](cyt) and CAB2 promoter activity are uncoupled in the timing of cab1 (toc1-1) mutant but not in toc1-2. We suggest that the circadian oscillations of [Ca(2+)](cyt) and CAB2 promoter activity are regulated by distinct oscillators with similar components that are used in a different manner and that these oscillators may be located in different cell types in Arabidopsis.

the plant cell

Distinct Light and Clock Modulation of Cytosolic Free Ca2+ Oscillations and Rhythmic<i>CHLOROPHYLL A/B BINDING PROTEIN2</i>Promoter Activity in<i>Arabidopsis</i>

Distinct Light and Clock Modulation of Cytosolic Free Ca2+ Oscillations and RhythmicCHLOROPHYLL A/B BINDING PROTEIN2Promoter Activity inArabidopsis