氨氧化剂通过水生生态系统中的适应基质亲和力抵消了酸化应激
Senwei Tong1, Hui Shen1, Li-Li Han2
1State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen, China.
Nature communications
|January 27, 2026
概括
在不同的生态系统中,酸化对氨氧化有不同的影响. 一个关键的适应性涉及氨氧化微生物,特别是古生物的基质亲和度增加,以在变化的pH下维持循环.
科学领域:
- 环境微生物学环境微生物学
- 生物地质化学循环是什么
- 微生物适应 微生物适应
背景情况:
- 氨氧化是循环中的一个关键过程.
- 水中酸化对氨氧化有多种影响,其机制尚不清楚.
- 了解这些反应对于预测生态系统变化至关重要.
研究的目的:
- 研究氨氧化微生物适应水中酸化的适应机制.
- 为了协调有关化下氨氧化速率的相互矛盾的观察.
- 为预测未来环境条件下的循环动态建立一个框架.
主要方法:
- 在各种水生生态系统中进行pH操纵实验.
- 使用一个模型氨氧化古生物物种,Nitrosopumilus maritimus菌株SCM1.1.
- 将微生物基质亲和反应纳入生态模型.
主要成果:
- 酸化会诱导氨氧化微生物的基质亲和度的补偿性增加.
- 这种适应性在氨氧化古生物中比细菌更明显.
- 在中度酸性化下,由古细菌主导的系统保持或增加氧化率,而由细菌主导的系统则下降.
- 结合基质亲和力的模型准确地协调了先前的现场观测.
结论:
- 基质亲和力的调节是微生物对酸化的抵抗力的关键因素.
- 这种适应机制解释了古生物和细菌主导的系统中的不同反应.
- 在正在进行的海洋酸化下,为循环动态提供了一个预测框架.
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