Photoperiod length paces the temporal orchestration of cell cycle and carbon-nitrogen metabolism in Crocosphaera watsonii
| Type | : | ACL |
|---|---|---|
| Nature | : | Production scientifique |
| Au bénéfice du Laboratoire | : | Oui |
| Statut de publication | : | Publié |
| Année de publication | : | 2013 |
| Auteurs (6) | : | DRON Anthony RABOUILLE Sophie CLAQUIN Pascal TALEC Amélie RAIMBAULT Virginie SCIANDRA Antoine |
| Revue scientifique | : | Environmental Microbiology |
| Volume | : | 15 |
| Fascicule | : | 12 |
| Pages | : | 3292-3304 |
| DOI | : | 10.1111/1462-2920.12163 |
| URL | : | - |
| Abstract | : | We analysed the effect of photoperiod length (PPL) (16:8 and 8:16h of light-dark regime, named long and short PPL, respectively) on the temporal orchestration of the two antagonistic, carbon and nitrogen acquisitions in the unicellular, diazotrophic cyanobacterium Crocosphaera watsonii strain WH8501 growing diazotrophically. Carbon and nitrogen metabolism were monitored at high frequency, and their patterns were compared with the cell cycle progression. The oxygen-sensitive N-2 fixation process occurred mainly during the dark period, where photosynthesis cannot take place, inducing a light-dark cycle of cellular C:N ratio. Examination of circadian patterns in the cell cycle revealed that cell division occurred during the midlight period, (8h and 4h into the light in the long and short PPL conditions, respectively), thus timely separated from the energy-intensive diazotrophic process. Results consistently show a nearly 5h time lag between the end of cell division and the onset of N-2 fixation. Shorter PPLs affected DNA compaction of C.watsonii cells and also led to a decrease in the cell division rate. Therefore, PPL paces the growth of C.watsonii: a long PPL enhances cell division while a short PPL favours somatic growth (biomass production) with higher carbon and nitrogen cell contents. |
| Mots-clés | : | - |
| Commentaire | : | Times Cited: 1 Si 1 |
| Tags | : | PHYTOPULSE |
| Fichier attaché | : | - |
| Citation | : |
Dron A, Rabouille S, Claquin P, Talec A, Raimbault V, Sciandra A (2013) Photoperiod length paces the temporal orchestration of cell cycle and carbon-nitrogen metabolism in Crocosphaera watsonii. Environ Microbiol 15: 3292-3304 | doi: 10.1111/1462-2920.12163
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