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Biological clock

Reset / entrainment mechanism. Biological clock. An innate mechanism in living organisms that controls the periodicity or rhythm of various physiological functions or activities. Circadian rhythm Circadian: circa(around)+dies(day) Ultradian rhythm Infradian rhythm.

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Biological clock

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  1. Reset / entrainment mechanism Biological clock An innate mechanism in living organisms that controls the periodicity or rhythm of various physiological functions or activities. • Circadian rhythm • Circadian: circa(around)+dies(day) • Ultradian rhythm • Infradian rhythm Internal biological clock + change of environment

  2. Clock-associated genes • CCA1 • LHY • FKF1 • ZTL • Environments • Temperature • Light • Period • wave Relationship clock-associated genes and the photoreceptors

  3. ELF3 Encodes a Circadian Clock-Regulated Nuclear Protein That Functions in an Arabidopsis PHYB Signal Transduction Pathway

  4. elf3-1 elf3-1:cosmid E11 wild(C) elf3-1:cosmid B8 SD LD SD LD elf3 • Defective in light perception or light-mediated signal transduction • Defective in circadian rhythm responses

  5. Two types of photoreceptor • Five red/far-red light-absorbing phytochromes • Phytochrome A[PHYA], PHYB, PHYC, PHYD, and PHYE • Two blue/UV-A light-absorbing cryptochromes • CRY1 and CRY2

  6. ELF3 • novel 695 amino acid protein • without any significant homology to proteins of known function • glutamine/threonine-rich sequence and nuclear localization signal in the C-terminal region transcription factor

  7. Fig 1-A. Sequence comparison of ELF3 and putative ELF3 homologs Arabidopsis Cardamine tomato rice maize ELF3 function may be conserved between dicots and monocots.

  8. Fig 1-B. ELF3 is a novel nuclear protein.

  9. Fig 2. Accumulation of the ELF3 protein is regulated by light and the circadian clock.

  10. Fig 3-1. ELF3 and PHYB proteins interaction in the Yeast Tow-Hybrid System

  11. Fig 3-2. ELF3 and PHYB proteins interaction in Vitro PHYB-ELF3 interaction in vivo could regulate aspects of PHYB-mediated photomorphogenesis

  12. Fig 4-A. Hypocotyl length of seedlings grown under dark, white, red, and far-red light condition.

  13. Fig 4-B Flowering time for wild type and mutant plants under LD or SD growth conditions.

  14. Fig 5. Genetic interactions of the ELF3 overexpression(ELF3-OX) line with the phyB mutation

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