Comammox Nitrospira clade B as a key nitrification driver in coastal Antarctica
编号:802 访问权限:仅限参会人 更新:2024-12-30 20:45:19 浏览:192次 口头报告

报告开始:2025年01月15日 09:30(Asia/Shanghai)

报告时间:15min

所在会场:[S3] Session 3-The Nitrogen Cycle Towards a Sustainable Ocean: From Microbes to Global Biogeochemistry [S3-4] The Nitrogen Cycle Towards a Sustainable Ocean: From Microbes to Global Biogeochemistry

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摘要
Antarctica's remote coastal regions, largely isolated from anthropogenic nitrogen inputs, exhibit notably low nitrogen levels, yet the mechanisms driving the nitrogen cycle, particularly nitrate (NO3-) cycling, remain largely unexplored. This study delves into the microbial nitrogen cycling processes in these pristine environments, focusing on the biological origins of nitrate through detailed isotopic analyses and extensive metagenomic sequencing. By reconstructing 1,968 metagenome-assembled genomes across 29 microbial phyla from soil and lake sediments, we uncover the metabolic capacities for nitrogen fixation, nitrification, and denitrification, with a notable absence of anaerobic ammonium oxidation pathways. Our findings highlight the dominance of complete ammonia oxidizing (comammox) Nitrospira, which uniquely perform the entire nitrification process. Special adaptations such as trehalose synthesis for cold tolerance, high substrate affinity for efficient resource utilization, and alternative metabolic pathways for adaptation to nutrient-limited conditions are evident in these organisms. The pivotal role of comammox Nitrospira in autotrophic nitrification is further substantiated through 13C-DNA-based stable isotope probing, confirming their significant contribution to the nitrogen budget in coastal Antarctica. This research not only sheds light on the critical nitrification processes driven by comammox Nitrospira clade B but also enhances our understanding of microbial adaptations and ecosystem functioning under extreme conditions.
关键词
nitrification, DNA-SIP, metagenomes, comammox, Antarctica
报告人
Ping Han
Professor East China Normal University

稿件作者
Ping Han East China Normal University
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重要日期
  • 会议日期

    01月13日

    2025

    01月17日

    2025

  • 09月27日 2024

    初稿截稿日期

  • 01月17日 2025

    注册截止日期

主办单位
State Key Laboratory of Marine Environmental Science, Xiamen University
承办单位
State Key Laboratory of Marine Environmental Science, Xiamen University
Department of Earth Sciences, National Natural Science Foundation of China
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