Abstract
Bitter-1 is a shallow hypersaline soda lake in Kulunda Steppe (Altai region, Russia). During a study period between 2005 and 2016, the salinity in the littoral area of the lake fluctuated within the range from 85 to 400 g/L (in July of each year). Light-dependent nitrogen fixation occurred in this lake up to the salt-saturating conditions. The rates increased with a decrease in salinity, both under environmental conditions and in laboratory simulations. The salinities below 100 g/L were favorable for light-dependent nitrogen fixation, while the process was dramatically inhibited above 200 g/L salts. The analysis of nifH genes in environmental samples and in enrichment cultures of diazotrophic phototrophs suggested that anaerobic fermenting and sulfate-reducing bacteria could participate in the dark nitrogen fixation process up to soda-saturating conditions. However, we cannot exclude the possibility that haloalkaliphilic nonheterocystous cyanobacteria (Euhalothece sp. and Geitlerinema sp.) and anoxygenic purple sulfur bacteria (Ectothiorhodospira sp.) might also play a role in the process at light conditions. The heterocystous cyanobacterium Nodularia sp. develops at low salinity (below 80 g/L) that is not characteristic for Bitter-1 Lake and thus does not make a significant contribution to the nitrogen fixation in this lake.
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Acknowledgements
This work was supported by the Program of fundamental research for state academies (No. 01201350928), Russian Academy of Sciences and Federal Agency of Scientific Organizations (Project Nos. 0104-2018-0033 and 0104-2018-0030). ZN was supported by the NRC “Kurchatov Institute”. DS was supported by the the Gravitation-SIAM program of the Dutch Ministry of Education and Science (24002002).
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Communicated by A. Oren.
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Namsaraev, Z., Samylina, O., Sukhacheva, M. et al. Effect of salinity on diazotrophic activity and microbial composition of phototrophic communities from Bitter-1 soda lake (Kulunda Steppe, Russia). Extremophiles 22, 651–663 (2018). https://doi.org/10.1007/s00792-018-1026-7
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DOI: https://doi.org/10.1007/s00792-018-1026-7
Keywords
- Nitrogen fixation
- Phototrophic bacteria
- Sulfate-reducing bacteria
- Hypersaline
- Soda lakes