Ontogenesis of diurnal rhythms of cAMP concentration, outer segment disc shedding and retinomotor movements in the eye of the brown trout, Salmo trutta.
Histological analyses of the retina of Salmo trutta post-embryos exhibit rhythmic disc shedding at 6 weeks, followed by cyclic retinomotor movements at 7 weeks. Diurnal variations in cAMP concentration, as established by a radioreceptor assay, develop simultaneously with retinomotor movements and are fully expressed at 9.5 weeks. In continuous darkness, neither retinomotor movements nor intra-ocular peaks of cAMP occur, indicating that the endogenous oscillator for retinomotor movements and cAMP levels is not yet developed.
McCormack
C A
CA
Department of Zoology, University College Dublin, Ireland.
Hayden
T J
TJ
Kunz
Y W
YW
D000818:Animals; D002940:Circadian Rhythm; D000242:Cyclic AMP / Q000502:physiology*; D003623:Dark Adaptation / Q000502:physiology; D008027:Light; D008543:Melanins / Q000502:physiology; D008675:Metamorphosis, Biological; D010588:Phagosomes / Q000502:physiology; D010786:Photoreceptor Cells / Q000166:cytology*; D010857:Pigment Epithelium of Eye / Q000166:cytology*; D012160:Retina / Q000166:cytology*; D012374:Rod Cell Outer Segment / Q000166:cytology*; D012487:Salmonidae / Q000254:growth & development*; D014337:Trout / Q000254:growth & development*; D014796:Visual Perception / Q000502:physiology*
D008543:Melanins; D000242:Cyclic AMP