Adaptive traits of cysts of the snow alga Sanguina nivaloides unveiled by 3D subcellular imaging - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Nature Communications Année : 2023

Adaptive traits of cysts of the snow alga Sanguina nivaloides unveiled by 3D subcellular imaging

Jade Ezzedine
Clarisse Uwizeye
Grégory Si Larbi
  • Fonction : Auteur
Gaelle Villain
Mathilde Louwagie
  • Fonction : Auteur
Marion Schilling
Benoît Gallet
Adeline Stewart
Dimitris Petroutsos
Juliette Jouhet
Stéphane Ravanel
Alberto Amato
Denis Falconet
  • Fonction : Auteur
Eric Maréchal
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Résumé

Abstract Sanguina nivaloides is the main alga forming red snowfields in high mountains and Polar Regions. It is non-cultivable. Analysis of environmental samples by X-ray tomography, focused-ion-beam scanning-electron-microscopy, physicochemical and physiological characterization reveal adaptive traits accounting for algal capacity to reside in snow. Cysts populate liquid water at the periphery of ice, are photosynthetically active, can survive for months, and are sensitive to freezing. They harbor a wrinkled plasma membrane expanding the interface with environment. Ionomic analysis supports a cell efflux of K + , and assimilation of phosphorus. Glycerolipidomic analysis confirms a phosphate limitation. The chloroplast contains thylakoids oriented in all directions, fixes carbon in a central pyrenoid and produces starch in peripheral protuberances. Analysis of cells kept in the dark shows that starch is a short-term carbon storage. The biogenesis of cytosolic droplets shows that they are loaded with triacylglycerol and carotenoids for long-term carbon storage and protection against oxidative stress.
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hal-04294008 , version 1 (21-11-2023)

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Jade Ezzedine, Clarisse Uwizeye, Grégory Si Larbi, Gaelle Villain, Mathilde Louwagie, et al.. Adaptive traits of cysts of the snow alga Sanguina nivaloides unveiled by 3D subcellular imaging. Nature Communications, 2023, 14 (1), pp.7500. ⟨10.1038/s41467-023-43030-7⟩. ⟨hal-04294008⟩
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