[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.
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 :
0036-8075
eISSN :
1095-9203
Publisher :
American Association for the Advancement of Science, Washington, United States - District of Columbia
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 SNSF - Swiss National Science Foundation Gordon and Betty Moore Foundation Simons Foundation National Centre of Competence in Research (NCCR) Microbiomes, Switzerland
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