CIRCADIAN CLOCK ASSOCIATED1 Transcript Stability and the Entrainment of the Circadian Clock in Arabidopsis

Sep 18, 2007Plant physiology

How CIRCADIAN CLOCK ASSOCIATED1 RNA stability affects the timing of the internal clock in Arabidopsis plants

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Abstract

CCA1 messenger RNA has a short half-life in red and blue light.

  • Circadian clocks in plants help predict and adapt to environmental changes over a 24-hour cycle.
  • Light and temperature can entrain the molecular oscillators that regulate circadian rhythms in Arabidopsis.
  • Previous findings indicated that light influences the expression of the oscillator gene CCA1.
  • In transgenic plants with constant CCA1 expression, CCA1 transcript stability is affected by light conditions.
  • CCA1 messenger RNA remains stable in the dark and far-red light but degrades quickly in red and blue light.
  • The instability determinants of CCA1 transcripts are likely found in the gene's coding region.

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