Phytochromes and cryptochromes in the entrainment of the Arabidopsis circadian clock.
Circadian clocks are synchronized by environmental cues such as light. Photoreceptor-deficient Arabidopsis thaliana mutants were used to measure the effect of light fluence rate on circadian period in plants. Phytochrome B is the primary high-intensity red light photoreceptor for circadian control, and phytochrome A acts under low-intensity red light. Cryptochrome 1 and phytochrome A both act to transmit low-fluence blue light to the clock. Cryptochrome 1 mediates high-intensity blue light signals for period length control. The presence of cryptochromes in both plants and animals suggests that circadian input pathways have been conserved throughout evolution.[1]References
- Phytochromes and cryptochromes in the entrainment of the Arabidopsis circadian clock. Somers, D.E., Devlin, P.F., Kay, S.A. Science (1998) [Pubmed]
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