Different circadian oscillators control Ca2+ fluxes and Lhcb gene expression
AUTOR(ES)
Sai, Jiqing
FONTE
The National Academy of Sciences
RESUMO
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 Ca2+ oscillations. Therefore, these two circadian rhythms are not linked hierarchically. These data provide evidence for separate circadian pacemakers controlling molecular events in plants.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=18090Documentos Relacionados
- Measurement of sarcoplasmic reticulum Ca2+ content and sarcolemmal Ca2+ fluxes in isolated rat ventricular myocytes during spontaneous Ca2+ release.
- Multiple oscillators regulate circadian gene expression in Neurospora
- A Clock- and Light-Regulated Gene That Links the Circadian Oscillator to LHCB Gene Expression
- Sodium nitroprusside alters Ca2+ flux components and Ca2(+)-dependent fluxes of K+ and Cl- in rat aorta.
- Blood pressure development of the spontaneously hypertensive rat after concurrent manipulations of dietary Ca2+ and Na+. Relation to intestinal Ca2+ fluxes.
