AI Article Synopsis
- The genus studied is a significant part of freshwater bacterioplankton communities, previously thought to contain only heterotrophic species.
- Recent findings show that 28 out of 46 strains display photosynthesis genes, revealing their potential for photoheterotrophy and indicating widespread environmental significance.
- Genomic analysis of select strains confirmed a conserved photosynthesis gene structure and demonstrated functional photosynthetic capabilities, suggesting a new role for this genus in freshwater ecosystems.
Article Abstract
The genus (, ) is a common and a highly active component of freshwater bacterioplanktonic communities. To date, the genus has been considered to contain only heterotrophic species. In this study, we detected the photosynthesis genes and in 28 of 46 strains from three lineages. The sequences obtained are very closely related to environmental sequences detected in various freshwater habitats, indicating the ubiquity and potential importance of photoheterotrophic in nature. Additionally, we sequenced and analyzed the genomes of 5 potentially photoheterotrophic strains, to gain further insights into their phototrophic capacity. The structure of the photosynthesis gene cluster turned out to be highly conserved within the genus and also among all potentially photosynthetic strains. The expression of photosynthetic complexes was detected in a culture of II-D5 using spectroscopic and pigment analyses. This was further verified by a novel combination of infrared microscopy and fluorescent hybridization. The data presented document that the capacity to perform anoxygenic photosynthesis is common among the members of the genus , indicating that they may have a novel role in freshwater habitats.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5734016 | PMC |
| http://dx.doi.org/10.1128/AEM.02116-17 | DOI Listing |
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