Nitrogen fixation and nitrogenase (nifH) expression in tropical waters of the eastern North Atlantic
Abstract Expression of nifH in 28 surface water samples collected during fall 2007 from six stations in the vicinity of the Cape Verde Islands (north-east Atlantic) was examined using reverse transcription-polymerase chain reaction (RT-PCR)-based clone libraries and quantitative RT-PCR (RT-qPCR) ana...
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croxfordunivpr:10.1038/ismej.2010.205 2024-09-15T18:23:41+00:00 Nitrogen fixation and nitrogenase (nifH) expression in tropical waters of the eastern North Atlantic Turk, Kendra A Rees, Andrew P Zehr, Jonathan P Pereira, Nicole Swift, Paul Shelley, Rachel Lohan, Maeve Woodward, E Malcolm S Gilbert, Jack 2011 http://dx.doi.org/10.1038/ismej.2010.205 http://www.nature.com/articles/ismej2010205.pdf http://www.nature.com/articles/ismej2010205 https://academic.oup.com/ismej/article-pdf/5/7/1201/56548143/41396_2011_article_bfismej2010205.pdf en eng Oxford University Press (OUP) https://academic.oup.com/pages/standard-publication-reuse-rights The ISME Journal volume 5, issue 7, page 1201-1212 ISSN 1751-7362 1751-7370 journal-article 2011 croxfordunivpr https://doi.org/10.1038/ismej.2010.205 2024-08-05T04:29:12Z Abstract Expression of nifH in 28 surface water samples collected during fall 2007 from six stations in the vicinity of the Cape Verde Islands (north-east Atlantic) was examined using reverse transcription-polymerase chain reaction (RT-PCR)-based clone libraries and quantitative RT-PCR (RT-qPCR) analysis of seven diazotrophic phylotypes. Biological nitrogen fixation (BNF) rates and nutrient concentrations were determined for these stations, which were selected based on a range in surface chlorophyll concentrations to target a gradient of primary productivity. BNF rates greater than 6 nmolN l−1 h−1 were measured at two of the near-shore stations where high concentrations of Fe and PO43− were also measured. Six hundred and five nifH transcripts were amplified by RT-PCR, of which 76% are described by six operational taxonomic units, including Trichodesmium and the uncultivated UCYN-A, and four non-cyanobacterial diazotrophs that clustered with uncultivated Proteobacteria. Although all five cyanobacterial phylotypes quantified in RT-qPCR assays were detected at different stations in this study, UCYN-A contributed most significantly to the pool of nifH transcripts in both coastal and oligotrophic waters. A comparison of results from RT-PCR clone libraries and RT-qPCR indicated that a γ-proteobacterial phylotype was preferentially amplified in clone libraries, which underscores the need to use caution interpreting clone-library-based nifH studies, especially when considering the importance of uncultivated proteobacterial diazotrophs. Article in Journal/Newspaper North Atlantic North East Atlantic Oxford University Press The ISME Journal 5 7 1201 1212 |
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Oxford University Press |
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English |
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Abstract Expression of nifH in 28 surface water samples collected during fall 2007 from six stations in the vicinity of the Cape Verde Islands (north-east Atlantic) was examined using reverse transcription-polymerase chain reaction (RT-PCR)-based clone libraries and quantitative RT-PCR (RT-qPCR) analysis of seven diazotrophic phylotypes. Biological nitrogen fixation (BNF) rates and nutrient concentrations were determined for these stations, which were selected based on a range in surface chlorophyll concentrations to target a gradient of primary productivity. BNF rates greater than 6 nmolN l−1 h−1 were measured at two of the near-shore stations where high concentrations of Fe and PO43− were also measured. Six hundred and five nifH transcripts were amplified by RT-PCR, of which 76% are described by six operational taxonomic units, including Trichodesmium and the uncultivated UCYN-A, and four non-cyanobacterial diazotrophs that clustered with uncultivated Proteobacteria. Although all five cyanobacterial phylotypes quantified in RT-qPCR assays were detected at different stations in this study, UCYN-A contributed most significantly to the pool of nifH transcripts in both coastal and oligotrophic waters. A comparison of results from RT-PCR clone libraries and RT-qPCR indicated that a γ-proteobacterial phylotype was preferentially amplified in clone libraries, which underscores the need to use caution interpreting clone-library-based nifH studies, especially when considering the importance of uncultivated proteobacterial diazotrophs. |
format |
Article in Journal/Newspaper |
author |
Turk, Kendra A Rees, Andrew P Zehr, Jonathan P Pereira, Nicole Swift, Paul Shelley, Rachel Lohan, Maeve Woodward, E Malcolm S Gilbert, Jack |
spellingShingle |
Turk, Kendra A Rees, Andrew P Zehr, Jonathan P Pereira, Nicole Swift, Paul Shelley, Rachel Lohan, Maeve Woodward, E Malcolm S Gilbert, Jack Nitrogen fixation and nitrogenase (nifH) expression in tropical waters of the eastern North Atlantic |
author_facet |
Turk, Kendra A Rees, Andrew P Zehr, Jonathan P Pereira, Nicole Swift, Paul Shelley, Rachel Lohan, Maeve Woodward, E Malcolm S Gilbert, Jack |
author_sort |
Turk, Kendra A |
title |
Nitrogen fixation and nitrogenase (nifH) expression in tropical waters of the eastern North Atlantic |
title_short |
Nitrogen fixation and nitrogenase (nifH) expression in tropical waters of the eastern North Atlantic |
title_full |
Nitrogen fixation and nitrogenase (nifH) expression in tropical waters of the eastern North Atlantic |
title_fullStr |
Nitrogen fixation and nitrogenase (nifH) expression in tropical waters of the eastern North Atlantic |
title_full_unstemmed |
Nitrogen fixation and nitrogenase (nifH) expression in tropical waters of the eastern North Atlantic |
title_sort |
nitrogen fixation and nitrogenase (nifh) expression in tropical waters of the eastern north atlantic |
publisher |
Oxford University Press (OUP) |
publishDate |
2011 |
url |
http://dx.doi.org/10.1038/ismej.2010.205 http://www.nature.com/articles/ismej2010205.pdf http://www.nature.com/articles/ismej2010205 https://academic.oup.com/ismej/article-pdf/5/7/1201/56548143/41396_2011_article_bfismej2010205.pdf |
genre |
North Atlantic North East Atlantic |
genre_facet |
North Atlantic North East Atlantic |
op_source |
The ISME Journal volume 5, issue 7, page 1201-1212 ISSN 1751-7362 1751-7370 |
op_rights |
https://academic.oup.com/pages/standard-publication-reuse-rights |
op_doi |
https://doi.org/10.1038/ismej.2010.205 |
container_title |
The ISME Journal |
container_volume |
5 |
container_issue |
7 |
container_start_page |
1201 |
op_container_end_page |
1212 |
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1810463926905733120 |