Diverse community of rhizobia-diatom symbioses fixes nitrogen in the South Pacific gyre.
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| Autores principales: | , , , , , , , , , , , , , , |
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| Formato: | Artículo científico |
| Lenguaje: | en |
| Publicado: |
ISME communications
2025
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| _version_ | 1868266117062983680 |
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| author | Esti, Mertcan Philippi, Miriam Duerschlag, Julia Ferdelman, Timothy G Tolman, Jennifer LaRoche, Julie Martínez-Pérez, Clara Lavik, Gaute Tschitschko, Bernhard Wong, Hon Lun Kraberg, Alexandra Littmann, Sten Kidane, Abiel T Mohr, Wiebke Kuypers, Marcel M M |
| author_facet | Esti, Mertcan Philippi, Miriam Duerschlag, Julia Ferdelman, Timothy G Tolman, Jennifer LaRoche, Julie Martínez-Pérez, Clara Lavik, Gaute Tschitschko, Bernhard Wong, Hon Lun Kraberg, Alexandra Littmann, Sten Kidane, Abiel T Mohr, Wiebke Kuypers, Marcel M M Esti, Mertcan Philippi, Miriam Duerschlag, Julia Ferdelman, Timothy G Tolman, Jennifer LaRoche, Julie Martínez-Pérez, Clara Lavik, Gaute Tschitschko, Bernhard Wong, Hon Lun Kraberg, Alexandra Littmann, Sten Kidane, Abiel T Mohr, Wiebke Kuypers, Marcel M M |
| collection | PubMed - marine biology |
| contents | Diverse community of rhizobia-diatom symbioses fixes nitrogen in the South Pacific gyre. Esti, Mertcan Philippi, Miriam Duerschlag, Julia Ferdelman, Timothy G Tolman, Jennifer LaRoche, Julie Martínez-Pérez, Clara Lavik, Gaute Tschitschko, Bernhard Wong, Hon Lun Kraberg, Alexandra Littmann, Sten Kidane, Abiel T Mohr, Wiebke Kuypers, Marcel M M Nitrogen fixation is crucial for sustaining productivity in most of the open ocean. Cyanobacteria are the most prominent N-fixers, but based on the gene, a marker gene of the enzyme that fixes N into ammonia, non-cyanobacterial N-fixers often predominate the N-fixing community. Yet, the vast majority of them remain poorly characterized. In the oligotrophic South Pacific gyre, we found that most gene sequences belonged to non-cyanobacterial N-fixers that dominated the waters with measurable N fixation rates. Approximately two thirds of the non-cyanobacterial sequences affiliated with the group "Marine 1" which also contains the recently identified diatom symbiont Tectiglobus diatomicola, a heterotrophic bacterium belonging to the order Rhizobiales, and its closest relative, . . Using fluorescence hybridization and electron microscopy, we found that . Tectiglobus-diatom symbioses were present throughout the gyre. These diatom symbioses were also present in samples devoid of from . and . indicating that other members of the "Marine 1" group are also diatom symbionts. At least two morphologically distinct diatoms harbored . Tectiglobus symbionts, revealing a so far unknown diversity in hosts for these rhizobial N-fixers. Single-cell activity measurements showed that . Tectiglobus-diatom symbioses actively fixed nitrogen and could account for up to 40% of the N fixation in the South Pacific gyre. Given the size of the largest oceanic biome and the abundance of . Tectiglobus-related genes in other ocean regions, these heterotrophic N-fixers likely play a major role in marine nitrogen cycling. |
| format | Artículo científico |
| id | pubmed_41334095 |
| institution | PubMed |
| language | en |
| publishDate | 2025 |
| publisher | ISME communications |
| record_format | pubmed |
| spellingShingle | Diverse community of rhizobia-diatom symbioses fixes nitrogen in the South Pacific gyre. Esti, Mertcan Philippi, Miriam Duerschlag, Julia Ferdelman, Timothy G Tolman, Jennifer LaRoche, Julie Martínez-Pérez, Clara Lavik, Gaute Tschitschko, Bernhard Wong, Hon Lun Kraberg, Alexandra Littmann, Sten Kidane, Abiel T Mohr, Wiebke Kuypers, Marcel M M Diverse community of rhizobia-diatom symbioses fixes nitrogen in the South Pacific gyre. Esti, Mertcan Philippi, Miriam Duerschlag, Julia Ferdelman, Timothy G Tolman, Jennifer LaRoche, Julie Martínez-Pérez, Clara Lavik, Gaute Tschitschko, Bernhard Wong, Hon Lun Kraberg, Alexandra Littmann, Sten Kidane, Abiel T Mohr, Wiebke Kuypers, Marcel M M Nitrogen fixation is crucial for sustaining productivity in most of the open ocean. Cyanobacteria are the most prominent N-fixers, but based on the gene, a marker gene of the enzyme that fixes N into ammonia, non-cyanobacterial N-fixers often predominate the N-fixing community. Yet, the vast majority of them remain poorly characterized. In the oligotrophic South Pacific gyre, we found that most gene sequences belonged to non-cyanobacterial N-fixers that dominated the waters with measurable N fixation rates. Approximately two thirds of the non-cyanobacterial sequences affiliated with the group "Marine 1" which also contains the recently identified diatom symbiont Tectiglobus diatomicola, a heterotrophic bacterium belonging to the order Rhizobiales, and its closest relative, . . Using fluorescence hybridization and electron microscopy, we found that . Tectiglobus-diatom symbioses were present throughout the gyre. These diatom symbioses were also present in samples devoid of from . and . indicating that other members of the "Marine 1" group are also diatom symbionts. At least two morphologically distinct diatoms harbored . Tectiglobus symbionts, revealing a so far unknown diversity in hosts for these rhizobial N-fixers. Single-cell activity measurements showed that . Tectiglobus-diatom symbioses actively fixed nitrogen and could account for up to 40% of the N fixation in the South Pacific gyre. Given the size of the largest oceanic biome and the abundance of . Tectiglobus-related genes in other ocean regions, these heterotrophic N-fixers likely play a major role in marine nitrogen cycling. |
| title | Diverse community of rhizobia-diatom symbioses fixes nitrogen in the South Pacific gyre. |
| url | https://pubmed.ncbi.nlm.nih.gov/41334095/ |