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定量分析下沉海洋颗粒中异养细菌的固氮作用。

Quantifying nitrogen fixation by heterotrophic bacteria in sinking marine particles.

机构信息

Department of Biology, Marine Biological Section, University of Copenhagen, Helsingør, Denmark.

Centre for Ocean Life, DTU Aqua, Technical University of Denmark, Kgs.Lyngby, Denmark.

出版信息

Nat Commun. 2021 Jul 2;12(1):4085. doi: 10.1038/s41467-021-23875-6.

DOI:10.1038/s41467-021-23875-6
PMID:34215729
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8253789/
Abstract

Nitrogen ([Formula: see text]) fixation by heterotrophic bacteria associated with sinking particles contributes to marine N cycling, but a mechanistic understanding of its regulation and significance are not available. Here we develop a mathematical model for unicellular heterotrophic bacteria growing on sinking marine particles. These bacteria can fix [Formula: see text] under suitable environmental conditions. We find that the interactive effects of polysaccharide and polypeptide concentrations, sinking speed of particles, and surrounding [Formula: see text] and [Formula: see text] concentrations determine the [Formula: see text] fixation rate inside particles. [Formula: see text] fixation inside sinking particles is mainly fueled by [Formula: see text] respiration rather than [Formula: see text] respiration. Our model suggests that anaerobic processes, including heterotrophic [Formula: see text] fixation, can take place in anoxic microenvironments inside sinking particles even in fully oxygenated marine waters. The modelled [Formula: see text] fixation rates are similar to bulk rates measured in the aphotic ocean, and our study consequently suggests that particle-associated heterotrophic [Formula: see text] fixation contributes significantly to oceanic [Formula: see text] fixation.

摘要

与下沉颗粒相关的异养细菌进行的氮 ([Formula: see text]) 固定有助于海洋氮循环，但对其调节和意义的机制理解尚不清楚。在这里，我们为在下沉海洋颗粒上生长的单细胞异养细菌开发了一个数学模型。这些细菌可以在合适的环境条件下固定 [Formula: see text]。我们发现多糖和多肽浓度、颗粒下沉速度以及周围 [Formula: see text] 和 [Formula: see text] 浓度的相互作用决定了颗粒内部的 [Formula: see text] 固定率。[Formula: see text] 固定在下沉颗粒内部主要由 [Formula: see text] 呼吸提供动力，而不是 [Formula: see text] 呼吸。我们的模型表明，即使在完全含氧的海水中，包括异养 [Formula: see text] 固定在内的厌氧过程也可以在下沉颗粒内的缺氧微环境中发生。模拟的 [Formula: see text] 固定率与在无光海洋中测量的总速率相似，因此我们的研究表明，与颗粒相关的异养 [Formula: see text] 固定对海洋 [Formula: see text] 固定有重要贡献。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ef1e/8253789/f228a6319f0b/41467_2021_23875_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ef1e/8253789/498f54cb1f22/41467_2021_23875_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ef1e/8253789/62da771d4143/41467_2021_23875_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ef1e/8253789/3d9e39cf8011/41467_2021_23875_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ef1e/8253789/dd176cc20258/41467_2021_23875_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ef1e/8253789/73bf0bad4608/41467_2021_23875_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ef1e/8253789/84f89e15bfe2/41467_2021_23875_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ef1e/8253789/0b64d4ca9e0f/41467_2021_23875_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ef1e/8253789/f228a6319f0b/41467_2021_23875_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ef1e/8253789/498f54cb1f22/41467_2021_23875_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ef1e/8253789/62da771d4143/41467_2021_23875_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ef1e/8253789/3d9e39cf8011/41467_2021_23875_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ef1e/8253789/dd176cc20258/41467_2021_23875_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ef1e/8253789/73bf0bad4608/41467_2021_23875_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ef1e/8253789/84f89e15bfe2/41467_2021_23875_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ef1e/8253789/0b64d4ca9e0f/41467_2021_23875_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ef1e/8253789/f228a6319f0b/41467_2021_23875_Fig8_HTML.jpg

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