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Article Dans Une Revue The Innovation Geoscience Année : 2024

Illuminating a bacterial adaptation mechanism: infrared-driven cell division in deep-sea hydrothermal vent environments

Jie Dai
  • Fonction : Auteur
Xue-Gong Li
  • Fonction : Auteur
Tian-Yuan Zhang
  • Fonction : Auteur
Hong Chen
  • Fonction : Auteur
Wei-Jia Zhang
  • Fonction : Auteur
Denghui Li
  • Fonction : Auteur
Jia Liu
  • Fonction : Auteur
Jianwei Chen
  • Fonction : Auteur
Yuan Lu
  • Fonction : Auteur
Long-Fei Wu

Résumé

Based on Planck's black-body radiation law, deep-sea hydrothermal vent chimneys emit light, predominantly infrared light, which potentially supports bacterial photosynthesis in this ecosystem independently of the solar energy. To investigate the impact of this geothermal light on bacterial growth, we collected samples from the Southwest Indian Ridge and demonstrated that infrared light alone promotes bacterial growth and alters population composition. The mechanism of infrared stimulated growth was analyzed by monitoring cell wall synthesis using the Tepidibacter hydrothermalis strain SWIR-1, which was isolated from cultures enriched through infrared irradiation. The results showed that the elevated hydrostatic pressure inhibited septal peptidoglycan synthesis and cell division, but had less effect on cell elongation, chromosome replication and segregation. The dominant cell shape was filaments with some swelling and inertness in cell wall synthesis depending on the level of pressure applied. Interestingly, irradiation with 880 nm infrared light effectively initiated septal synthesis and alleviated the obstruction. This revelation uncovers a novel adaptation mechanism involving infrared light for bacteria dwelling in deep-sea environments, and sheds light on the potential of infrared-mediated photobiomodulation.
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Dates et versions

hal-04470155 , version 1 (21-02-2024)

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Paternité - Pas d'utilisation commerciale - Pas de modification

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Citer

Jie Dai, Xue-Gong Li, Tian-Yuan Zhang, Hong Chen, Wei-Jia Zhang, et al.. Illuminating a bacterial adaptation mechanism: infrared-driven cell division in deep-sea hydrothermal vent environments. The Innovation Geoscience, 2024, pp.100050. ⟨10.59717/j.xinn-geo.2024.100050⟩. ⟨hal-04470155⟩

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