Observations on a magnetotactic bacteria-grazing ciliate in sediment from the intertidal zone of Huiquan Bay, China

Si CHEN; Kaixuan CUI; Wenyan ZHANG; Yicong ZHAO; Tian XIAO; Hongmiao PAN; Wuchang ZHANG; Long-Fei WU

doi:10.1007/s00343-021-1011-3

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Observations on a magnetotactic bacteria-grazing ciliate in sediment from the intertidal zone of Huiquan Bay, China

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

- Observations on a magnetotactic bacteria-grazing ciliate in sediment from the intertidal zone of Huiquan Bay, China
- Observations on a magnetotactic bacteria-grazing ciliate in sediment from the intertidal zone of Huiquan Bay, China
- 海洋湖沼学报（英文） 2021年39卷第6期页码：2053-2062
- Affiliations：
  
  1.CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
  2.University of Chinese Academy of Sciences, Beijing 100049, China
  3.Laboratory for Marine Ecology and Environmental Science, Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, China
  4.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
  5.International Associated Laboratory of Evolution and Development of Magnetotactic Multicellular Organisms(LIA-MagMC), CNRS-CAS, Qingdao 266071, China
  6.Aix Marseille Univ, CNRS, LCB, IM2 B, IMM, Marseille 13009, France
- Author bio：
  
  Hongmiao PAN, panhongmiao@qdio.ac.cn
  Wuchang ZHANG, wuchangzhang@qdio.ac.cn
- Funds：
  
  the National Natural Science Foundation of China(41776130);the National Natural Science Foundation of China(41776131);the National Natural Science Foundation of China-Shandong Joint Fund(U1706208);© Chinese Society for Oceanology and Limnology, Science Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021Electronic supplementary material Supplementary material (Supplementary Video 1 & Supplementary Fig.S1) is available in the online version of this article at https://doi.org/10.1007/s00343-021-1011-3.
- DOI：10.1007/s00343-021-1011-3
  中图分类号：
- 收稿：2021-01-08，
  
  录用：2021-2-25，
  
  网络首发：2021-04-15，
  
  纸质出版：2021-11
- Accepted：
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Observations on a magnetotactic bacteria-grazing ciliate in sediment from the intertidal zone of Huiquan Bay, China[J]. 海洋湖沼学报（英文）, 2021,39(6):2053-2062.

Si CHEN, Kaixuan CUI, Wenyan ZHANG, et al. Observations on a magnetotactic bacteria-grazing ciliate in sediment from the intertidal zone of Huiquan Bay, China[J]. Journal of Oceanology and Limnology, 2021, 39(6): 2053-2062.
Observations on a magnetotactic bacteria-grazing ciliate in sediment from the intertidal zone of Huiquan Bay, China[J]. 海洋湖沼学报（英文）, 2021,39(6):2053-2062. DOI： 10.1007/s00343-021-1011-3.

Si CHEN, Kaixuan CUI, Wenyan ZHANG, et al. Observations on a magnetotactic bacteria-grazing ciliate in sediment from the intertidal zone of Huiquan Bay, China[J]. Journal of Oceanology and Limnology, 2021, 39(6): 2053-2062. DOI： 10.1007/s00343-021-1011-3.

摘要

Abstract

Magnetotactic bacteria (MTB) are a group of prokaryotes having the ability to orient and swim along geomagnetic field lines because they contain intracellular magnetosomes that are synthesized through a biomineralization process. Magnetosomes have recently also been found in unicellular eukaryotes

which are referred to as magnetically responsive protists (MRPs). The magnetosomes have three origins in MRPs. In this study

we characterized a MTB-grazing ciliated MRP that was magnetically collected from intertidal sediment of Huiquan Bay

Qingdao

China. Based on 18S rRNA gene sequence analysis

the ciliated MRP was tentatively identified as

Uronemella parafilificum

HQ. Using transmission electron microscopy

we observed that magnetosomes having 2–3 shapes were randomly distributed within this ciliate. Energydispersive X-ray spectroscopy and high-resolution transmission electron microscopy images of the magnetosomes were consistent with them being composed of magnetite. Magnetosomes having the same shape and mineral composition were also detected in MTB that occurred in the same environment as the ciliated MRP. Statistical analysis showed that the size and shape of the magnetosomes in the ciliated MRP were similar to those in MTB. The results suggest that this ciliated MRP can graze

ingest

and digest various types of MTB. It is certainly worth noting that this is the first record of MRPs in Asian aquatic sediment and suggesting they might be widely distributed. These results also support the assertion that MRPs probably contribute to the ecological cycles of iron

and expand possibilities for research into the mechanism of magnetoreception in eukaryotes.

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Keywords

references

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