A denitrifying community associated with a major, marine nitrogen fixer

被引:17
作者
Coates, Christopher J. [1 ,2 ]
Wyman, Michael [1 ]
机构
[1] Univ Stirling, Biol & Environm Sci, Fac Nat Sci, Stirling FK9 4LA, Scotland
[2] Swansea Univ, Dept Biosci, Coll Sci, Swansea SA2 8PP, W Glam, Wales
基金
英国自然环境研究理事会; 英国生物技术与生命科学研究理事会;
关键词
AEROBIC DENITRIFICATION; TRICHODESMIUM SPP; OXIDE REDUCTASE; NORTH PACIFIC; ARABIAN SEA; SP NOV; GENE; FIXATION; CYANOBACTERIUM; POPULATIONS;
D O I
10.1111/1462-2920.14007
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
The diazotrophic cyanobacterium, Trichodesmium, is an integral component of the marine nitrogen cycle and contributes significant amounts of new nitrogen to oligotrophic, tropical/subtropical ocean surface waters. Trichodesmium forms macroscopic, fusiform (tufts), spherical (puffs) and raft-like colonies that provide a pseudobenthic habitat for a host of other organisms including marine invertebrates, microeukaryotes and numerous other microbes. The diversity and activity of denitrifying bacteria found in association with the colonies was interrogated using a series of molecular-based methodologies targeting the gene encoding the terminal step in the denitrification pathway, nitrous oxide reductase (nosZ). Trichodesmium spp. sampled from geographically isolated ocean provinces (the Atlantic Ocean, the Red Sea and the Indian Ocean) were shown to harbor highly similar, taxonomically related communities of denitrifiers whose members are affiliated with the Roseobacter clade within the Rhodobacteraceae (Alphaproteobacteria). These organisms were actively expressing nosZ in samples taken from the mid-Atlantic Ocean and Red Sea implying that Trichodesmium colonies are potential sites of nitrous oxide consumption and perhaps earlier steps in the denitrification pathway also. It is proposed that coupled nitrification of newly fixed N is the most likely source of nitrogen oxides supporting nitrous oxide cycling within Trichodesmium colonies.
引用
收藏
页码:4978 / 4992
页数:15
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