How light affect the magnetotactic behavior and reproduction of ellipsoidal multicellular magnetoglobules?

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How light affect the magnetotactic behavior and reproduction of ellipsoidal multicellular magnetoglobules?

Special Section: Magnetotactic Bacteria and Magnetoreception | Updated：2023-05-20

- How light affect the magnetotactic behavior and reproduction of ellipsoidal multicellular magnetoglobules?
- Journal of Oceanology and Limnology Vol. 39, Issue 6, Pages: 2005-2014(2021)
- Affiliations：
  
  1.State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
  2.Aix Marseille University, CNRS, LCB, Centuri, IM2 B, IMM, Marseille 13009, France
  3.International Associated Laboratory of Evolution and Development of Magnetotactic Multicellular Organisms(LIA-MagMC), CNRS-CAS, Marseille 13402, France
  4.CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
  5.Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
  6.Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
  7.Aix Marseille University, Centuri, Marseille 13009, France
- Author bio：
  
  Long-Fei WU, wu@imm.cnrs.fr
- Funds：
- DOI：10.1007/s00343-021-0493-3
  CLC：
- Received：19 October 2020，
  
  Accepted：24 February 2021，
  
  Online First：11 May 2021，
  
  Published：2021-11
- Accepted：
Scan QR Code
Xinxin QIAN, Yicong ZHAO, Claire-Lise SANTINI, et al. How light affect the magnetotactic behavior and reproduction of ellipsoidal multicellular magnetoglobules?[J]. Journal of Oceanology and Limnology, 2021, 39(6): 2005-2014.
DOI：

Xinxin QIAN, Yicong ZHAO, Claire-Lise SANTINI, et al. How light affect the magnetotactic behavior and reproduction of ellipsoidal multicellular magnetoglobules?[J]. Journal of Oceanology and Limnology, 2021, 39(6): 2005-2014. DOI： 10.1007/s00343-021-0493-3.

摘要

Abstract

Magnetotactic bacteria (MTB) synthesize intracellular magnetic organelles

magnetosomes

which consist of magnetic crystals that are enveloped in a membrane. Magnetosomes are organized into a chain(s) and confer on cells a magnetic dipolar moment. This magnetic property allows MTB cells to align and swim along geomagnetic field lines

a movement referred to as magnetotaxis. Some MTB species change their swim direction in response to illumination by UV

violet and blue light. Here we analyzed the polarity of morphology

magnetism

and motion in Mediterranean multicellular magnetotactic prokaryotes

also called

magnetoglobules or MMP. The magnetoglobules were assembled from 60–80 cells into an asymmetric ellipsoidal morphology with a relative narrow and large end. They swam dominantly northward

parallel to the direction of the magnetic field

with the narrow-end as the leading side. In response to a reversal in the direction of the magnetic field

they aligned quickly along the magnetic field lines and kept swimming northward. Interestingly

under constant illumination

385-nm UV light

magnetoglobules changed their swimming direction southward anti-parallel to the direction of the magnetic field

with the large-end as the leading side. The change from a northward to southward direction occurred along with an increase of swimming speed. A minimum of 35-mW/cm

2

irradiance of UV light was sufficient to trigger the swimming re-orientation. UV radiation also triggered the unidirectional division of magnetoglobules. Together these results revealed a coordination of the polarity of magnetoglobule morphology

magnetic moment

and swimming orientation

in response to magnetic and optical stimuli. The UV triggered the reversal of magnetotaxis and magnetoglobule division indicating the ecological significance of light for multicellular magnetotactic prokaryotes.

关键词

Keywords

references

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