Metabolic versatility of aerobic methane-oxidizing bacteria under anoxia in aquatic ecosystems

IF 3.6 4区生物学 Q2 ENVIRONMENTAL SCIENCES

Environmental Microbiology Reports Pub Date : 2024-09-04 DOI:10.1111/1758-2229.70002

Biao Li, Zhendu Mao, Jingya Xue, Peng Xing, Qinglong L. Wu

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Abstract

The potential positive feedback between global aquatic deoxygenation and methane (CH₄) emission emphasizes the importance of understanding CH₄ cycling under O₂-limited conditions. Increasing observations for aerobic CH₄-oxidizing bacteria (MOB) under anoxia have updated the prevailing paradigm that MOB are O₂-dependent; thus, clarification on the metabolic mechanisms of MOB under anoxia is critical and timely. Here, we mapped the global distribution of MOB under anoxic aquatic zones and summarized four underlying metabolic strategies for MOB under anoxia: (a) forming a consortium with oxygenic microorganisms; (b) self-generation/storage of O₂ by MOB; (c) forming a consortium with non-oxygenic heterotrophic bacteria that use other electron acceptors; and (d) utilizing alternative electron acceptors other than O₂. Finally, we proposed directions for future research. This study calls for improved understanding of MOB under anoxia, and underscores the importance of this overlooked CH₄ sink amidst global aquatic deoxygenation.

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水生生态系统缺氧条件下需氧甲烷氧化细菌的代谢多功能性。

全球水生脱氧与甲烷（CH4）排放之间可能存在正反馈，这强调了了解氧气受限条件下 CH4 循环的重要性。对缺氧条件下需氧CH4氧化细菌（MOB）的观察结果不断增加，更新了MOB依赖氧气的主流模式；因此，澄清缺氧条件下MOB的代谢机制至关重要且非常及时。在此，我们绘制了缺氧水域中MOB的全球分布图，并总结了缺氧条件下MOB的四种基本代谢策略：（a）与含氧微生物形成联合体；（b）MOB自身产生/储存O2；（c）与使用其他电子受体的非含氧异养菌形成联合体；以及（d）利用O2以外的其他电子受体。最后，我们提出了未来的研究方向。这项研究有助于加深对缺氧条件下 MOB 的了解，并强调了在全球水生生物脱氧过程中这一被忽视的甲烷汇的重要性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Environmental Microbiology Reports ENVIRONMENTAL SCIENCES-MICROBIOLOGY

CiteScore

6.00

自引率

3.00%

发文量

审稿时长

3.0 months

期刊介绍： The journal is identical in scope to Environmental Microbiology, shares the same editorial team and submission site, and will apply the same high level acceptance criteria. The two journals will be mutually supportive and evolve side-by-side. Environmental Microbiology Reports provides a high profile vehicle for publication of the most innovative, original and rigorous research in the field. The scope of the Journal encompasses the diversity of current research on microbial processes in the environment, microbial communities, interactions and evolution and includes, but is not limited to, the following: the structure, activities and communal behaviour of microbial communities microbial community genetics and evolutionary processes microbial symbioses, microbial interactions and interactions with plants, animals and abiotic factors microbes in the tree of life, microbial diversification and evolution population biology and clonal structure microbial metabolic and structural diversity microbial physiology, growth and survival microbes and surfaces, adhesion and biofouling responses to environmental signals and stress factors modelling and theory development pollution microbiology extremophiles and life in extreme and unusual little-explored habitats element cycles and biogeochemical processes, primary and secondary production microbes in a changing world, microbially-influenced global changes evolution and diversity of archaeal and bacterial viruses new technological developments in microbial ecology and evolution, in particular for the study of activities of microbial communities, non-culturable microorganisms and emerging pathogens.

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