Regensburg 2022 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 10: Cell Adhesion and Multicellular Systems
BP 10.3: Vortrag
Dienstag, 6. September 2022, 10:30–10:45, H13
Motility and collective behavior of gliding Chlamydomonas populations — •Alexandros Fragkopoulos1,2, Sebastian Till1, Florian Ebmeier1, Marco G. Mazza1,3, and Oliver Bäumchen1,2 — 1Max Planck Institute for Dynamics and Self-Organization (MPIDS), 37077 Göttingen, Germany — 2University of Bayreuth, Experimental Physics V, 95447 Bayreuth, Germany — 3Department of Mathematical Sciences, Loughborough University, Loughborough, Leicestershire LE11 3TU, UK
The model microbe Chlamydomonas reinhardtii, a unicellular biflagellated microalga, can adhere and colonize almost any surface under particular light conditions. Once the cells attach to a surface, an intraflagellar transport machinery translocates the cell body along the flagella, which are oriented in a 180∘ configuration. This motion is known as gliding motility. We find that gliding enables surface-associated Chlamydomonas cells to cluster and form compact, interconnected microbial communities [1]. We detect and analyze the movement of single cells and characterize the spatio-temporal evolution of the morphology of the colony. The motion of single cells exhibits rapid movements, followed by prolonged immobility. By analyzing the cell clustering, we observe the colony transitioning from local clusters to a single global network with increasing cell density. Simulations based on a purely mechanistic approach cannot capture the non-random cell positions. However, by including flagellar mechanosensing through a cognitive model, we quantitavely reproduce the experimental observations.
[1] Till et al., arXiv:2108.03902v1