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| Titel: |
Non chloroplastic pyridine nucleotides concentrations in acetabularia as related with the developmental program: Circadian modulation of the concentrations |
| Auteur: |
Van Langendonckt, Anne de Solan, Catherine Jerebzoff, Stephan Driessche, Therese Vanden |
| Verschenen in: |
Biological rhythm research |
| Paginering: | Jaargang 22 (1991) nr. 3 pagina's 223-236 |
| Jaar: |
1991-09 |
| Inhoud: |
The concentrations of non chloroplastic NAD+, NADP+, NADH and NADPH were followed during the development of the unicellular green alga Acetabularia. When Acetabularia enters the rapid growth phase, a slight increase in NAD+ level is observed, and a slight decrease in both NADH and NADPH levels. In contrast, a huge decrease in both NAD+ and NADP+ concentrations take place at the time caps are initiated and develop, together with a slight increase in both reduced pyridine nucleotides concentrations. This increase has been confirmed and extended from the primordium stage to the cysts bearing caps: NADH and NADPH steadily increase in concentration. The circadian rhythms of the four pyridine nucleotide concentrations have also been studied in the non chloroplastic fraction of Acetabularia. Both NAD+ and NADP+ concentrations oscillate in phase according to a biphasic mode. The first peak occurs at 3 h (CT) and the second one at 15h, whereas the troughs are at 6 and 22 h. The rhythms are maintained in constant dark, in phase with that of light-dark algae (with the possible delay of the minima). The reduced pyridine nucleotides concentrations are very much lower than those of the oxidized forms; this fact, together with the large fluctuations make any conclusion as for the CR of the reduced forms uncertain. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 7 van 10 gevonden artikelen
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