SAR11 bacteria linked to ocean anoxia and nitrogen loss

被引：127

作者：

Tsementzi, Despina ^{[1
]}

Wu, Jieying ^{[2
]}

Deutsch, Samuel ^{[3
]}

Nath, Sangeeta ^{[3
]}

Rodriguez-R, Luis M. ^{[2
]}

Burns, Andrew S. ^{[2
]}

Ranjan, Piyush ^{[2
]}

Sarode, Neha ^{[2
]}

Malmstrom, Rex R. ^{[3
]}

Padilla, Cory C. ^{[2
]}

Stone, Benjamin K. ^{[4
]}

Bristow, Laura A. ^{[5
]}

Larsen, Morten ^{[6
,7
]}

Glass, Jennifer B. ^{[8
]}

Thamdrup, Bo ^{[6
,7
]}

Woyke, Tanja ^{[3
]}

Konstantinidis, Konstantinos T. ^{[1
,2
]}

Stewart, Frank J. ^{[2
]}

机构：

[1] Georgia Inst Technol, Sch Civil & Environm Engn, Ford Environm Sci & Technol Bldg,311 Ferst Dr, Atlanta, GA 30332 USA

[2] Georgia Inst Technol, Sch Biol Sci, Ford Environm Sci & Technol Bldg,311 Ferst Dr, Atlanta, GA 30332 USA

[3] Dept Energy Joint Genome Inst, 2800 Mitchell Dr, Walnut Creek, CA 94598 USA

[4] Bowdoin Coll, Dept Biol, 255 Maine St, Brunswick, ME 04011 USA

[5] Max Planck Inst Marine Microbiol, Biochem Grp, D-28359 Bremen, Germany

[6] Univ Southern Denmark, Dept Biol, Campusvej 55, DK-5230 Odense M, Denmark

[7] Univ Southern Denmark, Nord Ctr Earth Evolut NordCEE, Campusvej 55, DK-5230 Odense M, Denmark

[8] Georgia Inst Technol, Sch Earth & Atmospher Sci, Ford Environm Sci & Technol Bldg,311 Ferst Dr, Atlanta, GA 30332 USA

来源：

NATURE | 2016年 / 536卷 / 7615期

基金：

美国国家科学基金会; 新加坡国家研究基金会; 欧洲研究理事会;

关键词：

NITRITE-OXIDIZING BACTERIUM; 2ND NITRATE REDUCTASE; METAGENOMIC ANALYSIS; SEASONAL DYNAMICS; SINGLE-CELL; SEQUENCE; GENOME; IDENTIFICATION; GENES; CLASSIFICATION;

D O I：

10.1038/nature19068

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Bacteria of the SAR11 clade constitute up to one half of all microbial cells in the oxygen-rich surface ocean. SAR11 bacteria are also abundant in oxygen minimum zones (OMZs), where oxygen falls below detection and anaerobic microbes have vital roles in converting bioavailable nitrogen to N-2 gas. Anaerobic metabolism has not yet been observed in SAR11, and it remains unknown how these bacteria contribute to OMZ biogeochemical cycling. Here, genomic analysis of single cells from the world's largest OMZ revealed previously uncharacterized SAR11 lineages with adaptations for life without oxygen, including genes for respiratory nitrate reductases (Nar). SAR11 nar genes were experimentally verified to encode proteins catalysing the nitrite-producing first step of denitrification and constituted similar to 40% of OMZ nar transcripts, with transcription peaking in the anoxic zone of maximum nitrate reduction activity. These results link SAR11 to pathways of ocean nitrogen loss, redefining the ecological niche of Earth's most abundant organismal group.

引用

页码：179 / +

页数：17

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