Different circadian oscillators control Ca <sup>2+</sup> fluxes and <i>Lhcb</i> gene expression

DOI Web Site 被引用文献5件
  • Jiqing Sai
    Department of Biology, Box 1812-B, Vanderbilt University, Nashville, TN 37235
  • Carl Hirschie Johnson
    Department of Biology, Box 1812-B, Vanderbilt University, Nashville, TN 37235

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<jats:p> Circadian biological clocks control many biological events, but the pathways by which these events are controlled are largely unknown. Based on a model suggesting that cytosolic-free calcium levels control the expression of the <jats:italic>Lhcb</jats:italic> gene in plants, we tested whether the circadian oscillation of free calcium is responsible for driving the rhythm of <jats:italic>Lhcb</jats:italic> expression. We found that these rhythms free-run with different periods in tobacco seedlings in constant conditions. Moreover, robust oscillations of <jats:italic>Lhcb</jats:italic> promoter activity continued in undifferentiated tobacco calli in the absence of Ca <jats:sup>2+</jats:sup> oscillations. Therefore, these two circadian rhythms are not linked hierarchically. These data provide evidence for separate circadian pacemakers controlling molecular events in plants. </jats:p>

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