在低氧值以下的海水中微生物的碳氧化
Sarah Wolf1, Clare Jayawickrama1, Craig A Carlson2,3
1Department of Microbiology, Oregon State University, 220 Nash Hall, Corvallis, OR, USA.
Scientific reports
|January 22, 2025
概括
缺氧减缓了海洋的碳氧化,支持了缺氧屏障假说. 专门的微生物在低氧气中壮成长,影响海洋脱氧率和微生物进化在氧气最小区 (OMZs).
科学领域:
- 海洋生物学 海洋生物学
- 生物地质化学生物地质化学
- 微生物生态学 微生物生态学
背景情况:
- 全球氧气最小区 (OMZ) 正在扩大,但很少达到无氧.
- 低氧屏障假设提出氧化酶酶在氧气水平下降的情况下限制呼吸前的碳氧化.
- 酶动力学 (Michaelis Menten常数) 表明氧化酶比呼吸系统酶对低氧更敏感.
研究的目的:
- 用实验来测试缺氧是否会减缓海洋环境中的碳氧化和氧气减少.
- 为了研究受控的溶氧 (DO) 水平对微生物群落组成的影响.
- 为了评估氧化过程对不同DO度的敏感性.
主要方法:
- 中宇宙实验使用植物浮游生物的开花作为碳源.
- 控制的黑暗化与不同溶解氧 (DO) 度 (有氧与缺氧).
- 测量总氧气利用率 (TOU) 和微生物群体分析通过安普利康测序.
主要成果:
- 低毒性情况 (大约. 与氧气条件相比,7.1 μM O2) 减少了总氧气利用率21.7% (约. 245.1 μM O2) 在43天的时间里.
- 将氧气条件恢复到缺氧治疗加速了氧气利用,证实了对DO的敏感性.
- 显而易见的微生物群落出现了:Thioglobaceae,OM190,ABY1和SAR86亚类D2472在缺氧中壮成长,而Candidatus Actinomarina和SAR11则被抑制.
结论:
- 这些发现支持低氧屏障假设,表明氧化酶动力学可以减缓海洋脱氧.
- 微生物社区的转变突出了对低氧环境的适应性和生物地化学循环中的潜在作用.
- 氧化过程的氧敏感性是理解OMZ动态和微生物进化的一个关键因素.
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