Controlled motility in the cyanobacterium Trichodesmium regulates aggregate architecture

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Keywords :

motility; aggregation; cyanobacteria; filamentous; Trichodesmium

Abstract :

[en] The ocean’s nitrogen is largely fixed by cyanobacteria, including Trichodesmium, which forms aggregates comprising hundreds of filaments arranged in organized architectures. Aggregates often form upon exposure to stress and have ecological and biophysical characteristics that differ from those of single filaments. Here, we report that Trichodesmium aggregates can rapidly modulate their shape, responding within minutes to changes in environmental conditions. Combining video microscopy and mathematical modeling, we discovered that this reorganization is mediated by “smart reversals” wherein gliding filaments reverse when their overlap with other filaments diminishes. By regulating smart reversals, filaments control aggregate architecture without central coordination. We propose that the modulation of gliding motility at the single-filament level is a determinant of Trichodesmium’s aggregation behavior and ultimately of its biogeochemical role in the ocean.

Disciplines :

Physical, chemical, mathematical & earth Sciences: Multidisciplinary, general & others
Environmental sciences & ecology

Author, co-author :

Pfreundt, Ulrike

Słomka, Jonasz

Schneider, Giulia

Sengupta, Anupam ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)

Carrara, Francesco

Fernandez, Vicente

Ackermann, Martin

Stocker, Roman

External co-authors :

yes

Language :

English

Title :

Controlled motility in the cyanobacterium Trichodesmium regulates aggregate architecture

Publication date :

26 May 2023

Journal title :

Science

ISSN :

1095-9203

Publisher :

American Association for the Advancement of Science, Washington, United States - District of Columbia

Volume :

380

Issue :

6647

Pages :

830-835

Peer reviewed :

Peer Reviewed verified by ORBi

Focus Area :

Physics and Materials Science

Additional URL :

https://www.science.org/doi/abs/10.1126/science.adf2753

FnR Project :

FNR11572821 - Biophysics Of Microbial Adaptation To Fluctuations In The Environment, 2017 (15/05/2018-14/05/2023) - Anupam Sengupta

Funders :

FNR - Fonds National de la Recherche [LU]
SNSF - Swiss National Science Foundation [CH]
Gordon and Betty Moore Foundation [US-CA]
Simons Foundation [US-NY]
National Centre of Competence in Research (NCCR) Microbiomes, Switzerland

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