Document Detail

Eye and gonad: role in the dual-oscillator circadian system of female Japanese quail.
MedLine Citation:
PMID:  9039006     Owner:  NLM     Status:  MEDLINE    
Experiments were conducted to determine the anatomic and physiological basis of the dual-oscillator circadian system of female Japanese quail. After blocking of ocular light perception by eye-patching, the circadian body temperature rhythm dissociates into two circadian components in continuous lighting (LL). One component free runs with a period significantly shorter than 24 h [mean period (tau) = 22.7 h] and is driven by an ocular pacemaker, whereas the other component free runs with a period significantly longer than 24 h (tau = 26.3 h). The long free-running rhythm is driven by the same circadian clock that drives the circadian rhythm of ovulation. The expression of the long free-running rhythm in LL depends on the presence of the ovary: body temperature rhythmicity is abolished by ovariectomy. The two free-running oscillators in eye-patched birds showed evidence of mutual interaction. Significantly, the phase relationships that occur as the two oscillators interact can determine whether or not ovulation occurs. The results are discussed in terms of an "internal coincidence" mechanism for photoperiodic time measurement.
H Underwood; T Siopes; K Edmonds
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The American journal of physiology     Volume:  272     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1997 Jan 
Date Detail:
Created Date:  1997-03-31     Completed Date:  1997-03-31     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  R172-82     Citation Subset:  IM    
Department of Zoology, North Carolina State University, Raleigh 27695-7617, USA.
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MeSH Terms
Body Temperature / physiology
Circadian Rhythm*
Coturnix / physiology*
Ocular Physiological Phenomena*
Ovary / physiology*
Oviposition / physiology
Sensory Deprivation
Grant Support

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