碳固定微生物的新陈代谢多样性和适应性在极端冰川的冷岩石中
Yuying Chen1, Yongqin Liu1,2,3, Mukan Ji1
1Center for the Pan-Third Pole Environment, Lanzhou University, Lanzhou 730000, China.
ISME communications
|April 22, 2025
概括
西藏冷岩含有多种碳固定微生物,包括菌和蛋白菌,对于了解极端环境碳循环至关重要. 这些微生物利用各种途径,适应恶劣的环境,并为全球碳预算做出贡献.
科学领域:
- 微生物学 微生物学
- 环境科学 环境科学
- 生物地质化学生物地质化学
背景情况:
- 冰川生态系统拥有独特的微生物群落,对碳循环至关重要.
- 了解在极端环境中的碳固定,如西藏冷岩,对于全球碳预算评估至关重要.
研究的目的:
- 研究藏藏冷岩中的碳固定微生物的组成,多样性和代谢潜力.
- 确定这个冰川生态系统中关键的微生物参与者和碳固定途径.
主要方法:
- 超基因组测序用于组装碳固定微生物的基因组.
- 用13C标记的碳酸盐探测DNA稳定的同位素,以确认代谢活性.
- 对微生物群落适应环境变量的分析.
主要成果:
- 鉴定了13个碳固定元基因组组装基因组,来自10个已知的和3个未分类的属.
- 证实了关键品种的代谢活性,包括蓝藻细菌 (Microcoleus,Phormidesmis) 和蛋白质细菌 (Rhizobacter,Rhodoferax).
- 揭示了多种碳固定途径,主要是卡尔文-本森-巴沙姆循环和3-基酸盐循环,化学自转也发挥了作用.
结论:
- 西藏冷矿拥有多样化的微生物群落,积极参与碳固定.
- 微生物适应波动的环境条件是这些生态系统的一个关键特征.
- 进一步探索替代碳固定途径是必要的,以全面了解冷矿碳循环.
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