Species- resolved, single- cell respiration rates reveal dominance of sulfate reduction in a deep continental subsurface ecosystem

• 成果类型: Article
• 署名作者: Lindsay, Melody R.; D'Angelo, Timothy; Munson-McGee, Jacob H.; Saidi-Mehrabad, Alireza; Devlin, Molly; McGonigle, Julia; Goodell, Elizabeth; Herring, Melissa; Lubelczyk, Laura C.; Mascena, Corianna; Brown, Julia M.; Gavelis, Greg; Liu, Jiarui; Yousavich, D. J.; Brehm, Scott D. Hamilton -; Hedlund, Brian P.; Lang, Susan; Treude, Tina; Poulton, Nicole J.; Stepanauskas, Ramunas; Moser, Duane P.; Emerson, David; Orcutt, Beth N.
• 署名单位: Bigelow Laboratory for Ocean Sciences; Nevada System of Higher Education (NSHE); Desert Research Institute NSHE; Nevada System of Higher Education (NSHE); University of Nevada Las Vegas; University System of Ohio; Oberlin College; Northeastern University; University of California System; University of California Los Angeles; Southern Illinois University System; Southern Illinois University; University of South Carolina System; University of South Carolina Columbia; University of California System; University of California Los Angeles
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-13499
• DOI: 10.1073/pnas.2309636121
• 发表日期: 2024-04-09
• 关键词: archaeal diversity; cooccurrence; bacterial; biomass; window; view; LIFE

摘要

Rates of microbial processes are fundamental to understanding the significance of microbial impacts on environmental chemical cycling. However, it is often difficult to quantify rates or to link processes to specific taxa or individual cells, especially in environments where there are few cultured representatives with known physiology. Here, we describe the use of the redox- enzyme- sensitive molecular probe RedoxSensorTM Green to measure rates of anaerobic electron transfer physiology (i.e., sulfate reduction and methanogenesis) in individual cells and link those measurements to genomic sequencing of the same single cells. We used this method to investigate microbial activity in hot, anoxic, California. Combining this method with electron donor amendment experiments and metatranscriptomics confirmed that the abundant spore formers including Candidatus Desulforudis audaxviator were actively reducing sulfate in this environment, most likely with acetate and hydrogen as electron donors. Using this approach, we measured environmental sulfate reduction rates at 0.14 to 26.9 fmol cell-1 h-1. Scaled to volume, this equates to a bulk environmental rate of -103 pmol sulfate L-1 d-1, similar to potential rates determined with radiotracer methods. Despite methane in the system, there was no evidence for active microbial methanogenesis at the time of sampling. Overall, this method is a powerful tool for estimating species- resolved, single- cell rates of anaerobic metabolism in low- biomass environments while simultaneously linking genomes to phenomes at the single- cell level. We reveal active elemental cycling conducted by several species, with a large portion attributable to Ca. Desulforudis audaxviator.