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>
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- Xiaodong Xu
- Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee 37235
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- Carlos T. Hotta
- Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, United Kingdom
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- Antony N. Dodd
- Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, United Kingdom
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- John Love
- Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, United Kingdom
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- Robert Sharrock
- Department of Plant Sciences, Montana State University, Bozeman, Montana 59717
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- Young Wha Lee
- Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee 37235
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- Qiguang Xie
- Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee 37235
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- Carl H. Johnson
- Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee 37235
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- Alex A.R. Webb
- Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, United Kingdom
説明
<jats:title>Abstract</jats:title><jats:p>Plants have circadian oscillations in the concentration of cytosolic free calcium ([Ca2+]cyt). To dissect the circadian Ca2+-signaling network, we monitored circadian [Ca2+]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 [Ca2+]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 [Ca2+]cyt, and this response requires PHYB, CRY1, and CRY2. Light input into the oscillator controlling [Ca2+]cyt rhythms is gated by EARLY FLOWERING3. Signals generated in the dark also regulate the circadian behavior of [Ca2+]cyt. Oscillations of [Ca2+]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 [Ca2+]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 [Ca2+]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.</jats:p>
収録刊行物
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- The Plant Cell
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The Plant Cell 19 (11), 3474-3490, 2007-11-01
Oxford University Press (OUP)
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詳細情報 詳細情報について
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- CRID
- 1361418519556883200
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- ISSN
- 1532298X
- http://id.crossref.org/issn/10404651
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- データソース種別
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- Crossref