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ORIGINAL RESEARCH article
Front. Mar. Sci.
Sec. Aquatic Microbiology
Volume 11 - 2024 |
doi: 10.3389/fmars.2024.1471465
Pressure-tolerant survival mechanism of Schizophyllum commune 20R-7-F01 isolated from deep sediments 2 kilometers below the seafloor
Provisionally accepted- 1 Nanjing University, Nanjing, China
- 2 Shanghai Ocean University, Shanghai, Shanghai Municipality, China
- 3 Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong Province, China
In anaerobic high hydrostatic pressure (HHP) sedimentary environments below the seafloor, fungi are found to dominate the eukaryotic communities, playing crucial ecological roles. However, the specific mechanisms by which fungi adapt to anaerobic HHP environments remain unclear. In this study, we investigated Schizophyllum commune 20R-7-F01 isolated from coal-bearing sediments at a depth of 2 km below the seafloor. By assessing the cell viability, biomass, and cell wall thickness changes of strain 20-7-1 under different HHP conditions, we observed that, compared to 0.1 MPa, strain 20-7-1 exhibited slower growth rates and decreased cell viability at 15 MPa and 35 MPa, yet demonstrated significant pressure tolerance.Transcriptomic and metabolomic analyses revealed that this strain activated the carbohydrate metabolic process to simultaneously utilize ethanol and lactic acid fermentation pathway. Additionally, it activates the oxidoreductase activity and hydrolase activity pathways to detoxify intracellular reactive oxygen species (ROS).Activation of the metal ion binding pathway increases the proportion of unsaturated fatty acids in the cell membrane, while instigation of the integral component of membrane pathway maintains cell wall structural stability. Furthermore, activation of the DNA repair pathway repairs DNA damage, demonstrating its comprehensive adaptive mechanisms against the HHP stress. These research findings deepen our understanding of fungal survival strategies and adaptation mechanisms in extreme 2 environments, laying the groundwork for further exploration of their roles in cycling of carbon, nitrogen, sulfur, and other elements in the deep biosphere.
Keywords: anaerobic, high hydrostatic pressure, Schizophyllum commune 20R-7-F01, Transcriptome, Metabolome, Correlation network analysis
Received: 30 Jul 2024; Accepted: 08 Oct 2024.
Copyright: © 2024 Zhao, Li, Liu, Fang and Liu. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence:
Dongxu Li, Nanjing University, Nanjing, China
Jie Liu, Shanghai Ocean University, Shanghai, 130012, Shanghai Municipality, China
Jiasong Fang, Shanghai Ocean University, Shanghai, 130012, Shanghai Municipality, China
Changhong Liu, Nanjing University, Nanjing, China
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