Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.1912313117 |
Dark biological superoxide production as a significant flux and sink of marine dissolved oxygen | |
Sutherland, Kevin M.1,2; Wankel, Scott D.1; Hansel, Colleen M.1 | |
2020-02-18 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2020 |
卷号 | 117期号:7页码:3433-3439 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The balance between sources and sinks of molecular oxygen in the oceans has greatly impacted the composition of Earth's atmosphere since the evolution of oxygenic photosynthesis, thereby exerting key influence on Earth's climate and the redox state of (sub)surface Earth. The canonical source and sink terms of the marine oxygen budget include photosynthesis, respiration, photo-respiration, the Mehler reaction, and other smaller terms. However, recent advances in understanding cryptic oxygen cycling, namely the ubiquitous one-electron reduction of O-2 to superoxide by microorganisms outside the cell, remains unexplored as a potential player in global oxygen dynamics. Here we show that dark extracellular superoxide production by marine microbes represents a previously unconsidered global oxygen flux and sink comparable in magnitude to other key terms. We estimate that extracellular superoxide production represents a gross oxygen sink comprising about a third of marine gross oxygen production, and a net oxygen sink amounting to 15 to 50% of that. We further demonstrate that this total marine dark extracellular superoxide flux is consistent with concentrations of superoxide in marine environments. These findings underscore prolific marine sources of reactive oxygen species and a complex and dynamic oxygen cycle in which oxygen consumption and corresponding carbon oxidation are not necessarily confined to cell membranes or exclusively related to respiration. This revised model of the marine oxygen cycle will ultimately allow for greater reconciliation among estimates of primary production and respiration and a greater mechanistic understanding of redox cycling in the ocean. |
英文关键词 | microbial superoxide reactive oxygen species marine dissolved oxygen |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000514096400021 |
WOS关键词 | HYDROGEN-PEROXIDE PRODUCTION ; EXTRACELLULAR-SUPEROXIDE ; GENERATED SUPEROXIDE ; MN(II) OXIDATION ; CHEMISTRY ; WATERS ; O-2(-) ; DECAY ; PHOTOPRODUCTION ; FRACTIONATION |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/249613 |
专题 | 地球科学 |
作者单位 | 1.Woods Hole Oceanog Inst, Dept Marine Chem & Geochem, Woods Hole, MA 02543 USA; 2.MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA |
推荐引用方式 GB/T 7714 | Sutherland, Kevin M.,Wankel, Scott D.,Hansel, Colleen M.. Dark biological superoxide production as a significant flux and sink of marine dissolved oxygen[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2020,117(7):3433-3439. |
APA | Sutherland, Kevin M.,Wankel, Scott D.,&Hansel, Colleen M..(2020).Dark biological superoxide production as a significant flux and sink of marine dissolved oxygen.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,117(7),3433-3439. |
MLA | Sutherland, Kevin M.,et al."Dark biological superoxide production as a significant flux and sink of marine dissolved oxygen".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 117.7(2020):3433-3439. |
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