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SUMMARY:Photosynthetic entrainment of the Arabidopsis circadian clock - Mi
 ke Haydon\, Signal Transduction
DTSTART:20121005T120000Z
DTEND:20121005T123000Z
UID:TALK40553@talks.cam.ac.uk
CONTACT:24938
DESCRIPTION:Circadian clocks allow optimization of growth and metabolism f
 or organisms exposed to daily changes in environment\, providing competiti
 ve advantage. Nuclear molecular oscillators form interlocking transcriptio
 n-translation feedback loops\, which are entrained by zeitgebers (time-giv
 ers)\, such as light and temperature\, to provide reference to adjust the 
 phase of the oscillator's 24 h cycle. Here\, we show that zeitgeber action
  of sugar into the Arabidopsis clock is distinct from light\, acts early i
 n the photoperiod and defines a 'metabolic dawn'.  By inhibiting photosynt
 hesis in the presence of light\, we reveal a role for photosynthesis in ci
 rcadian entrainment acting through the morning-expressed PSEUDO RESPONSE R
 EGULATOR 7 (PRR7) and show that prr7 mutants are insensitive to the effect
 s of sugar on circadian period. Thus\, photosynthesis has a profound effec
 t to entrain and maintain robust circadian rhythms in Arabidopsis\, demons
 trating a critical role for metabolism in regulation of the circadian cloc
 k.
LOCATION:Department of Plant Sciences\, Large Lecture Theatre
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