Different circadian oscillators control Ca(2+) fluxes and lhcb gene expression.

Sai J, Johnson CH
Proc Natl Acad Sci U S A. 1999 96 (20): 11659-63

PMID: 10500233 · PMCID: PMC18090 · DOI:10.1073/pnas.96.20.11659

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 Lhcb gene in plants, we tested whether the circadian oscillation of free calcium is responsible for driving the rhythm of Lhcb expression. We found that these rhythms free-run with different periods in tobacco seedlings in constant conditions. Moreover, robust oscillations of Lhcb promoter activity continued in undifferentiated tobacco calli in the absence of Ca(2+) oscillations. Therefore, these two circadian rhythms are not linked hierarchically. These data provide evidence for separate circadian pacemakers controlling molecular events in plants.

MeSH Terms (9)

Aequorin Calcium Circadian Rhythm Gene Expression Regulation, Plant Luminescent Measurements Photosynthetic Reaction Center Complex Proteins Plants, Toxic Promoter Regions, Genetic Tobacco

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