title: Endogenous oscillations in pathways of energy transduction as related to circadian rhythmicity and photoperiodic control.
abstract: Evidence is presented for endogenous rhythmicity in energy transducing sequences of cellular metabolism which result in a circadian rhythm in adenylate "energy charge" and redox state (NADPH/NADP). From phase dependent photocontrol of enzymatic activity and pyridine nucleotide pool-size levels it is concluded that light - via photoreceptor(s) of photoperiodic control - modulates energy flow under conditions where overall energy transduction displays a circadian rhythm. The results are discussed in relation to temporal organization of development in general.
mesh_terms: D000469:Alkaline Phosphatase / Q000378:metabolism; D002940:Circadian Rhythm; D003624:Darkness; D004735:Energy Transfer; D005954:Glucosephosphate Dehydrogenase / Q000378:metabolism; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases / Q000378:metabolism; D008027:Light; D008291:Malate Dehydrogenase / Q000378:metabolism; D009243:NAD; D009249:NADP; D010084:Oxidation-Reduction; D010734:Phosphogluconate Dehydrogenase / Q000378:metabolism; D010944:Plants / Q000378:metabolism*; D013696:Temperature
chemical_list: D009243:NAD; D009249:NADP; D008291:Malate Dehydrogenase; D010734:Phosphogluconate Dehydrogenase; D005954:Glucosephosphate Dehydrogenase; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases; D000469:Alkaline Phosphatase