Abstract
Inland athalassohaline solar salterns provide unique opportunity to study microbial successions along salinity gradients that resemble transition in natural hypersaline lakes. We analyzed for the first time 16S rRNA gene amplicon sequences of bacteria (V1–V2) and archaea (V4–V5) in saltern brines of India’s largest inland hypersaline Sambhar Lake. Brines of the salterns (S1–S4) are alkaline (pH 9.5–10.5) with salinities of 130, 170, 280 and 350 gL−1 respectively. 16S rRNA gene copy-number of archaea outnumbered that of bacteria in all salterns. Their diversity also increased along S1 through S4, while that of bacteria decreased. Brines of S3 and S4 were dominated by specialized extreme halophilic bacterial (Halanaerobiales, Rhodothermaceae) and archaeal (Halobacteriales, Haloferacales) members with recognized salt-in strategy for osmoadaptation. Microbial assemblages positively correlated to saltern pH, total salinity, and ionic composition. Archaea in S1 and S2 were unprecedentedly represented by poorly known as-yet uncultivated groups, Woesearchaeota (90.35–93.51%) and Nanohaloarchaeota that belong to the newly proposed nano-sized superphylum DPANN. In fact, these taxa were identified in archaeal datasets of other athalassohaline salterns after re-analysis using latest RDP database. Thus, microbial compositions in hypersaline lakes are complex and need revisit particularly for their archaeal diversity to understand their hitherto unknown ecological function in extreme environments.
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Acknowledgements
This work was financially supported by CSIR [No. 38(1410)/15/ EMR-II)]. Srikanta Pal, Sohini Banerjee and Puja Mukherjee are grateful to CSIR; Abhijit Sar to UGC-BSR; and Raju Biswas to WB-DST for their respective fellowships. We would thank the editors and two eminent unanimous reviewers whose inputs and suggestions have immensely improved the overall scientific quality of the final version of the manuscript.
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Pal, S., Biswas, R., Misra, A. et al. Poorly known microbial taxa dominate the microbiome of hypersaline Sambhar Lake salterns in India. Extremophiles 24, 875–885 (2020). https://doi.org/10.1007/s00792-020-01201-0
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DOI: https://doi.org/10.1007/s00792-020-01201-0