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Pré-Publication, Document De Travail Année : 2023

Hypometabolism to survive the long polar night in the diatom Fragilariopsis cylindrus

Karel Mocaer
  • Fonction : Auteur
Julie Guterman
  • Fonction : Auteur
Sebastien Guerin
  • Fonction : Auteur
Flavienne Bruyant
  • Fonction : Auteur
Marine Beguin
  • Fonction : Auteur
Marie-Helene Forget
  • Fonction : Auteur
Clara Bourbousse
Thomas Lacour
  • Fonction : Auteur
Jean-Eric Tremblay
  • Fonction : Auteur
Douglas Campbell
  • Fonction : Auteur
Johan Lavaud
  • Fonction : Auteur
Yannick Schwab
  • Fonction : Auteur
Marcel Babin
  • Fonction : Auteur
Chris Bowler

Résumé

Abstract Diatoms, the major eukaryotic phytoplankton in polar regions, are essential to sustain Arctic and Antarctic ecosystems. As such, it is fundamental to understand the physiological mechanisms and associated molecular basis of their resilience to the long polar night. Here, we report an integrative approach revealing that in prolonged darkness, diatom cells enter a state of quiescence associated with reduced metabolic and transcriptional activity during which no cell division occurs. We propose that minimal energy is provided by respiration and degradation of protein, carbohydrate, and lipid stores and that homeostasis is maintained by autophagy in prolonged darkness. We also report internal structural changes that manifest the morphological acclimation of cells to darkness. Our results further indicate that immediately following a return to light, diatom cells are able to use photoprotective mechanisms and rapidly resume photosynthesis. Cell division resumed rates similar to those before darkness. Our study demonstrates the remarkable robustness of polar diatoms to prolonged darkness at low temperatures. Graphical abstract Teaser To survive the long winter, polar diatoms slow down metabolism and express genes to assure survival following return to light.

Dates et versions

hal-04268690 , version 1 (02-11-2023)

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Nathalie Joli, Lorenzo Concia, Karel Mocaer, Julie Guterman, Juliette Laude, et al.. Hypometabolism to survive the long polar night in the diatom Fragilariopsis cylindrus. 2023. ⟨hal-04268690⟩
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