Kwon, Man Jae O'Loughlin, Edward J. Boyanov, Maxim I. Brulc, Jennifer M. Johnston, Eric R. Kemner, Kenneth M. Antonopoulos, Dionysios A. 2024-01-20T05:03:16Z 2024-01-20T05:03:16Z 2021-09-05 2016-01-22 1932-6203 https://pubs.kist.re.kr/handle/201004/124498 Although iron- and sulfate-reducing bacteria in subsurface environments have crucial roles in biogeochemical cycling of C, Fe, and S, how specific electron donors impact the compositional structure and activity of native iron-and/or sulfate-reducing communities is largely unknown. To understand this better, we created bicarbonate-buffered batch systems in duplicate with three different electron donors (acetate, lactate, or glucose) paired with ferrihydrite and sulfate as the electron acceptors and inoculated them with subsurface sediment as the microbial inoculum. Sulfate and ferrihydrite reduction occurred simultaneously and were faster with lactate than with acetate. 16S rRNA-based sequence analysis of the communities over time revealed that Desulfotomaculum was the major driver for sulfate reduction coupled with propionate oxidation in lactate-amended incubations. The reduction of sulfate resulted in sulfide production and subsequent abiotic reduction of ferrihydrite. In contrast, glucose promoted faster reduction of ferrihydrite, but without reduction of sulfate. Interestingly, the glucose-amended incubations led to two different biogeochemical trajectories among replicate bottles that resulted in distinct coloration (white and brown). The two outcomes in geochemical evolution might be due to the stochastic evolution of the microbial communities or subtle differences in the initial composition of the fermenting microbial community and its development via the use of different glucose fermentation pathways available within the community. Synchrotron-based x-ray analysis indicated that siderite and amorphous Fe(II) were formed in the replicate bottles with glucose, while ferrous sulfide and vivianite were formed with lactate or acetate. These data sets reveal that use of different C utilization pathways projects significant changes in microbial community composition over time that uniquely impact both the geochemistry and mineralogy of subsurface environments. English PUBLIC LIBRARY SCIENCE URANIUM-CONTAMINATED AQUIFER LEPIDOCROCITE GAMMA-FEOOH SUBSURFACE SEDIMENTS SP-NOV FERRIC IRON DISSIMILATORY REDUCTION METHANE PRODUCTION FE(III) REDUCTION GEN-NOV GROUNDWATER Impact of Organic Carbon Electron Donors on Microbial Community Development under Iron- and Sulfate-Reducing Conditions Article 10.1371/journal.pone.0146689 1 PLOS ONE, v.11, no.1 PLOS ONE 11 1 scie scopus 000368655300029 2-s2.0-84958231044 Multidisciplinary Sciences Science & Technology - Other Topics Article URANIUM-CONTAMINATED AQUIFER LEPIDOCROCITE GAMMA-FEOOH SUBSURFACE SEDIMENTS SP-NOV FERRIC IRON DISSIMILATORY REDUCTION METHANE PRODUCTION FE(III) REDUCTION GEN-NOV GROUNDWATER Organic carbon Sulfate reducing bacteria Iron reducing bacteria Microorganism Electron donor