氧气耐受性固定在海洋藻类殖民植物菌群中
Zenghu Zhang1,2, Ziwei Wang1,2, Peichen Teng2
1School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, China.
Applied and environmental microbiology
|October 20, 2025
概括
这项研究提供了第一个实验证据,证明了纯培养的海洋细菌 - - Planctomycetota - - 中固化的实验证据. 这些微生物利用耐氧机制和昼间节律来固定,为海洋营养循环做出了重大贡献.
科学领域:
- 海洋微生物学和微生物生态学
- 生物地质化学循环是什么
- 共生相互作用的共生相互作用.
背景情况:
- 浮游生物 (Planctomycetota) 是宏藻表面的主导细菌,对于营养循环至关重要.
- 基因组数据表明, Planctomycetota 具有固定潜力,但缺乏功能验证.
- 在氧藻中对氧气敏感的固定的机制仍然未被探索.
研究的目的:
- 提供第一个实验证据,证明在纯培养植物菌菌中固.
- 为了研究使得氧气耐受性固定在藻类相关的的适应.
- 为了评估固潜力的普遍性,在Planctomycetota属.
主要方法:
- 隔离和纯种植的Crateriforma sp. 的时间. HD03来自Saccharina japonica (kelp) 的.
- 在有氧条件下测量固速率.
- 对 nif 基因集群和适应基因的基因组分析.
- 在光周期下与海藻共同培养实验以研究nifH表达.
- 基因组调查142种植物菌种菌株.
主要成果:
- 石坑形状 sp. 石坑形状 sp. 在这里. 在有氧条件下,HD03在纯培养中证明了活性固定.
- 菌株HD03具有适应氧气耐受性,包括生物膜形成和hopanoid合成.
- 在海藻共同培养中,nifH表达在低氧黑暗阶段达到峰值,这表明白天调节.
- 基因组调查显示,NifHDK基因集群在两个不同的Planctomycetota群中广泛分布.
结论:
- 浮游生物 (Planctomycetota) 是功能验证的固剂,有助于海洋输入.
- 昼间调节和氧耐受机制使氧藻环境中的固定成为可能.
- 固定能力在Planctomycetota属中可能广泛存在.
相关概念视频
01:28Carbon-dioxide Fixation
628
Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
628
01:30Anoxygenic Photosynthesis
1.2K
Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green...
1.2K
01:28Anoxygenic Phototrophic Bacteria
773
Anoxygenic phototrophic bacteria are a diverse group of microorganisms that perform photosynthesis without producing oxygen. They primarily include purple sulfur bacteria, purple nonsulfur bacteria, green sulfur bacteria, and green nonsulfur bacteria. These bacteria are classified into the Gammaproteobacteria, Alphaproteobacteria, Betaproteobacteria, Chlorobi, and Chloroflexi lineages, each with distinct physiological and ecological adaptations.Purple sulfur bacteria belong to the...
773
01:26Oxygenic Photosynthesis
700
Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate...
700
01:30Bacterial Phylum Cyanobacteria
494
Cyanobacteria are a diverse group of oxygenic, phototrophic bacteria that played a pivotal role in converting Earth’s atmosphere from anoxic to oxygen-rich billions of years ago. They exhibit remarkable morphological diversity, ranging from unicellular forms to filamentous types, with cell sizes varying between 0.5 μm and 100 μm. Cyanobacteria are classified into five groups: Chroococcales (unicellular, dividing by binary fission), Pleurocapsales (unicellular, dividing by...
494
01:22Inorganic Nitrogen Assimilation
457
Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
457