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

Journal of Oceanology and Limnology 2021年第6期39卷 2005-2014页

作者： Xinxin QIAN Yicong ZHAO Claire-Lise SANTINI Hongmiao PAN Tian XIAO Haitao CHEN Tao SONG Jinhua LI Francois ALBERTO sophie brustlein Long-Fei WU State Key Laboratory of Microbial Resources Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China Aix Marseille University CNRSLCBCenturiIM2BIMMMarseille 13009France International Associated Laboratory of Evolution and Development of Magnetotactic Multicellular Organisms(LIA-MagMC) CNRS-CASMarseille 13402France CAS Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071China Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Aix Marseille University CenturiMarseille 13009France

Magnetotactic bacteria(MTB)synthesize intracellular magnetic organelles,magnetosomes,which consist of magnetic crystals that are enveloped in a *** are organized into a chain(s)and confer on cells a magnetic dipolar *** magnetic property allows MTB cells to align and swim along geomagnetic field lines,a movement referred to as *** MTB species change their swim direction in response to illumination by UV,violet and blue *** we analyzed the polarity of morphology,magnetism,and motion in Mediterranean multicellular magnetotactic prokaryotes,also called,magnetoglobules or *** magnetoglobules were assembled from 60-80 cells into an asymmetric ellipsoidal morphology with a relative narrow and large *** swam dominantly northward,parallel to the direction of the magnetic field,with the narrow-end as the leading *** response to a reversal in the direction of the magnetic field,they aligned quickly along the magnetic field lines and kept swimming ***,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 *** 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 *** radiation also triggered the unidirectional division of *** these results revealed a coordination of the polarity of magnetoglobule morphology,magnetic moment,and swimming orientation,in response to magnetic and optical *** UV triggered the reversal of magnetotaxis and magnetoglobule division indicating the ecological significance of light for multicellular magnetotactic prokaryotes.

关键词： photo-response magnetic alignment coordinated swimming

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