Fermentation couples Chloroflexi and sulfate-reducing bacteria to Cyanobacteria in hypersaline microbial mats
Abstract
Past studies of hydrogen cycling in hypersaline microbial mats have shown an active nighttime cycle, with production largely from Cyanobacteria and consumption from sulfate-reducing bacteria (SRB). However, the mechanisms and magnitude of hydrogen cycling have not been extensively studied. Two mats types near Guerrero Negro, Mexico$$-$$ permanently submerged Microcoleus microbial mat (GN-S), and intertidal Lyngbya microbial mat (GN-I)$$-$$were used in microcosm diel manipulation experiments with 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU), molybdate, ammonium addition, and physical disruption to understand the processes responsible for hydrogen cycling between mat microbes. Across microcosms, H2 production occurred under dark anoxic conditions with simultaneous production of a suite of organic acids. H2 production was not significantly affected by inhibition of nitrogen fixation, but rather appears to result from constitutive fermentation of photosynthetic storage products by oxygenic phototrophs. Comparison to accumulated glycogen and to CO2 flux indicated that, in the GN-I mat, fermentation released almost all of the carbon fixed via photosynthesis during the preceding day, primarily as organic acids. Across mats, although oxygenic and anoxygenic phototrophs were detected, cyanobacterial [NiFe]-hydrogenase transcripts predominated. Molybdate inhibition experiments indicated that SRBs from a wide distribution of DsrA phylotypes were responsible for H2 consumption. Incubation with 13C-acetate and NanoSIMS (secondary ion mass-spectrometry) indicatedmore »
- Authors:
-
- NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States). Exobiology Branch; Bay Area Environmental Research Inst., Sonoma, CA (United States)
- NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States). Exobiology Branch; Stanford Univ., CA (United States). Dept. of Civil and Environmental Engineering, and Chemical Engineering
- NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States). Exobiology Branch
- NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States). Exobiology Branch; SETI Inst., Mountain View, CA (United States)
- Stanford Univ., CA (United States). Dept. of Civil and Environmental Engineering, and Chemical Engineering
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Chemical Sciences Division
- Publication Date:
- Research Org.:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE; National Aeronautics and Space Administration (NASA)
- OSTI Identifier:
- 1396225
- Report Number(s):
- LLNL-JRNL-652431
Journal ID: ISSN 1664-302X
- Grant/Contract Number:
- AC52-07NA27344; SCW1039
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Frontiers in Microbiology
- Additional Journal Information:
- Journal Volume: 5; Journal ID: ISSN 1664-302X
- Publisher:
- Frontiers Research Foundation
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; 59 BASIC BIOLOGICAL SCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; microbial mats; hydrogen; fermentation; Guerrero Negro; NanoSIMS
Citation Formats
Lee, Jackson Z., Burow, Luke C., Woebken, Dagmar, Everroad, R. Craig, Kubo, Mike D., Spormann, Alfred M., Weber, Peter K., Pett-Ridge, Jennifer, Bebout, Brad M., and Hoehler, Tori M. Fermentation couples Chloroflexi and sulfate-reducing bacteria to Cyanobacteria in hypersaline microbial mats. United States: N. p., 2014.
Web. doi:10.3389/fmicb.2014.00061.
Lee, Jackson Z., Burow, Luke C., Woebken, Dagmar, Everroad, R. Craig, Kubo, Mike D., Spormann, Alfred M., Weber, Peter K., Pett-Ridge, Jennifer, Bebout, Brad M., & Hoehler, Tori M. Fermentation couples Chloroflexi and sulfate-reducing bacteria to Cyanobacteria in hypersaline microbial mats. United States. https://doi.org/10.3389/fmicb.2014.00061
Lee, Jackson Z., Burow, Luke C., Woebken, Dagmar, Everroad, R. Craig, Kubo, Mike D., Spormann, Alfred M., Weber, Peter K., Pett-Ridge, Jennifer, Bebout, Brad M., and Hoehler, Tori M. 2014.
"Fermentation couples Chloroflexi and sulfate-reducing bacteria to Cyanobacteria in hypersaline microbial mats". United States. https://doi.org/10.3389/fmicb.2014.00061. https://www.osti.gov/servlets/purl/1396225.
@article{osti_1396225,
title = {Fermentation couples Chloroflexi and sulfate-reducing bacteria to Cyanobacteria in hypersaline microbial mats},
author = {Lee, Jackson Z. and Burow, Luke C. and Woebken, Dagmar and Everroad, R. Craig and Kubo, Mike D. and Spormann, Alfred M. and Weber, Peter K. and Pett-Ridge, Jennifer and Bebout, Brad M. and Hoehler, Tori M.},
abstractNote = {Past studies of hydrogen cycling in hypersaline microbial mats have shown an active nighttime cycle, with production largely from Cyanobacteria and consumption from sulfate-reducing bacteria (SRB). However, the mechanisms and magnitude of hydrogen cycling have not been extensively studied. Two mats types near Guerrero Negro, Mexico$-$ permanently submerged Microcoleus microbial mat (GN-S), and intertidal Lyngbya microbial mat (GN-I)$-$were used in microcosm diel manipulation experiments with 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU), molybdate, ammonium addition, and physical disruption to understand the processes responsible for hydrogen cycling between mat microbes. Across microcosms, H2 production occurred under dark anoxic conditions with simultaneous production of a suite of organic acids. H2 production was not significantly affected by inhibition of nitrogen fixation, but rather appears to result from constitutive fermentation of photosynthetic storage products by oxygenic phototrophs. Comparison to accumulated glycogen and to CO2 flux indicated that, in the GN-I mat, fermentation released almost all of the carbon fixed via photosynthesis during the preceding day, primarily as organic acids. Across mats, although oxygenic and anoxygenic phototrophs were detected, cyanobacterial [NiFe]-hydrogenase transcripts predominated. Molybdate inhibition experiments indicated that SRBs from a wide distribution of DsrA phylotypes were responsible for H2 consumption. Incubation with 13C-acetate and NanoSIMS (secondary ion mass-spectrometry) indicated higher uptake in both Chloroflexi and SRBs relative to other filamentous bacteria. These manipulations and diel incubations confirm that Cyanobacteria were the main fermenters in Guerrero Negro mats and that the net flux of nighttime fermentation byproducts (not only hydrogen) was largely regulated by the interplay between Cyanobacteria, SRBs, and Chloroflexi.},
doi = {10.3389/fmicb.2014.00061},
url = {https://www.osti.gov/biblio/1396225},
journal = {Frontiers in Microbiology},
issn = {1664-302X},
number = ,
volume = 5,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 2014},
month = {Wed Jan 01 00:00:00 EST 2014}
}
Web of Science
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