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Phototaxis beyond turning: persistent accumulation and response acclimation of the microalga Chlamydomonas reinhardtii

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Arrieta, Jorge, Barreira, Ana, Chioccioli, Maurizio, Polin, Marco and Tuval, Idan (2017) Phototaxis beyond turning: persistent accumulation and response acclimation of the microalga Chlamydomonas reinhardtii. Scientific Reports, 7 (1). 3447. doi:10.1038/s41598-017-03618-8

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Official URL: https://doi.org/10.1038/s41598-017-03618-8

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Abstract

Phototaxis is an important reaction to light displayed by a wide range of motile microorganisms. Flagellated eukaryotic microalgae in particular, like the model organism Chlamydomonas reinhardtii, steer either towards or away from light by a rapid and precisely timed modulation of their flagellar activity. Cell steering, however, is only the beginning of a much longer process which ultimately allows cells to determine their light exposure history. This process is not well understood. Here we present a first quantitative study of the long timescale phototactic motility of Chlamydomonas at both single cell and population levels. Our results reveal that the phototactic strategy adopted by these microorganisms leads to an efficient exposure to light, and that the phototactic response is modulated over typical timescales of tens of seconds. The adaptation dynamics for phototaxis and chlorophyll fluorescence show a striking quantitative agreement, suggesting that photosynthesis controls quantitatively how cells navigate a light field.

Item Type: Journal Article
Divisions: Faculty of Science > Physics
SWORD Depositor: Library Publications Router
Journal or Publication Title: Scientific Reports
Publisher: Nature Publishing Group
ISSN: 2045-2322
Official Date: 14 June 2017
Dates:
DateEvent
14 June 2017Published
2 May 2017Accepted
Volume: 7
Number: 1
Article Number: 3447
DOI: 10.1038/s41598-017-03618-8
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access

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