Reference : Bistability in oxidative stress response determines the migration behavior of phytopl...
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Physical, chemical, mathematical & earth Sciences : Multidisciplinary, general & others
Physics and Materials Science
Bistability in oxidative stress response determines the migration behavior of phytoplankton in turbulence
Carrara, Francesco [Institute for Environmental Engineering > Department of Civil, Environmental and Geomatic Engineering, ETH Zurich, 8093 Zurich, Switzerland]
Sengupta, Anupam mailto [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS) >]
Behrendt, Lars [Science for Life Laboratory > Department of Environmental Toxicology, Uppsala University, Norbyv. 18A, 75236 Uppsala, Sweden]
Vardi, Assaf [Weizmann Institute of Science, Rehovot 7610001, Israel > Department of Plant and Environmental Sciences]
Stocker, Roman [Institute for Environmental Engineering, > Department of Civil, Environmental and Geomatic Engineering, ETH Zurich, 8093 Zurich, Switzerland]
[en] Turbulence is an important determinant of phytoplankton physiology, often leading to cell stress and damage. Turbulence affects phytoplankton migration, both by transporting cells and by triggering switches in migratory behavior, whereby vertically migrating cells can invert their direction of migration upon exposure to turbulent cues. However, a mechanistic link between single-cell physiology and vertical migration of phytoplankton in turbulence is currently missing. Here, by combining physiological and behavioral experimentswith a mathematical model of stress accumulation and dissipation, we show that the mechanism responsible for the switch in the direction of migration in the marine raphidophyte Heterosigma akashiwo is the integration of reactive oxygen species (ROS) signaling generated by turbulent cues. Within timescales as short as tens of seconds, the emergent downward-migrating subpopulation exhibited a two-fold increase of ROS, an indicator of stress, 15% lower photosynthetic efficiency, and 35% lower growth rate over multiple generations compared to the upward-migrating subpopulation. The origin of the behavioral split in a bistable oxidative stress response is corroborated by the observation that exposure of cells to exogenous stressors (H2O2, UV-A radiation or high irradiance), in lieu of turbulence, caused comparable ROS accumulation and an equivalent split into the two subpopulations. By providing a mechanistic link between single-cell physiology, population-scale migration and fitness, these results contribute to our understanding of phytoplankton community composition in future ocean conditions.
Fonds National de la Recherche - FnR
Researchers ; Professionals ; Students ; General public
FnR ; FNR11572821 > Anupam Sengupta > MBRACE > Biophysics Of Microbial Adaptation To Fluctuations In The Environment > 15/05/2018 > 14/05/2023 > 2017

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