ArticlePloS one2015
Widespread Distribution and Expression of Gamma A (UMB), an Uncultured, Diazotrophic, γ-Proteobacterial nifH Phylotype.
Article in PloS one, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers.
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Who cites it
16 citing papers in PubMed.
- Highly diverse diazotrophs drive high NFundamental research · 2026Article
- Diverse community of rhizobia-diatom symbioses fixes nitrogen in the South Pacific gyre.ISME communications · 2025Article
- Organic metabolite uptake by diazotrophs in the North Pacific Ocean.ISME communications · 2025Article
- Nitrogen fixation in the widely distributed marine γ-proteobacterial diazotrophScience advances · 2024Article
- Article
- Marine nitrogen-fixers in the Canadian Arctic Gateway are dominated by biogeographically distinct noncyanobacterial communities.FEMS microbiology ecology · 2023Article
- Non-cyanobacterial diazotrophs: global diversity, distribution, ecophysiology, and activity in marine waters.FEMS microbiology reviews · 2023Review
- Cell-specific measurements show nitrogen fixation by particle-attached putative non-cyanobacterial diazotrophs in the North Pacific Subtropical Gyre.Nature communications · 2022Article
- Transcriptional responses of Trichodesmium to natural inverse gradients of Fe and P availability.The ISME journal · 2022Article
- Planktonic Aggregates as Hotspots for Heterotrophic Diazotrophy: The Plot Thickens.Frontiers in microbiology · 2022Review
- UCYN-A/haptophyte symbioses dominate NISME communications · 2021Article
- Article
- Unexpected presence of the nitrogen-fixing symbiotic cyanobacterium UCYN-A in Monterey Bay, California.Journal of phycology · 2020Article
- Chasing after Non-cyanobacterial Nitrogen Fixation in Marine Pelagic Environments.Frontiers in microbiology · 2017Article
- Diversity and Activity of Diazotrophs in Great Barrier Reef Surface Waters.Frontiers in microbiology · 2017Article
- High levels of heterogeneity in diazotroph diversity and activity within a putative hotspot for marine nitrogen fixation.The ISME journal · 2016Article
Corrections and comments
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Authors and funding
5 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Marine dinitrogen (N2) fixation studies have focused nearly exclusively on cyanobacterial diazotrophs; however γ-proteobacteria are an abundant component of the marine community and have been largely overlooked until recently. Here we present a phylogenetic analysis of all nifH γ-proteobacterial sequences available in public databases and qPCR data of a γ-proteobacterial phylotype, Gamma A (UMB), obtained during several research cruises. Our analysis revealed a complex diversity of diazotrophic γ-proteobacteria. One phylotype in particular, Gamma A, was described in several traditional and quantitative PCR studies. Though several γ-proteobacterial nifH sequences have been described as laboratory contaminants, Gamma A is part of a large cluster of sequences isolated from marine environments and distantly related to the clade of contaminants. Using a TaqMan probe and primer set, Gamma A nifH DNA abundance and expression were analyzed in nearly 1000 samples collected during 15 cruises to the Atlantic and Pacific Oceans. The data showed that Gamma A is an active, cosmopolitan diazotroph found throughout oxygenated, oligotrophic waters reaching maximum abundances of 8 x 104 nifH DNA copies l-1 and 5 x 105 nifH transcript copies l-1. Gamma A nifH transcript abundances were on average 3 fold higher than nifH DNA abundances. The widespread distribution and activity of Gamma A indicate that it has potential to be a globally important N2 fixing organism.
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