Atmospheric chemosynthesis is phylogenetically and geographically widespread and contributes significantly to carbon fixation throughout cold deserts

Autor: Pok Man Leung, Hon Lun Wong, Devan S. Chelliah, Kate Montgomery, Angelique E. Ray, Don A. Cowan, Weidong Kong, Sean K. Bay, Mukan Ji, Aleks Terauds, Philip Hugenholtz, Belinda C. Ferrari, Chris Greening, Julian Zaugg, Timothy J. Williams, Nicole Benaud
Rok vydání: 2022
Předmět:
Zdroj: The ISME Journal. 16:2547-2560
ISSN: 1751-7370
1751-7362
DOI: 10.1038/s41396-022-01298-5
Popis: Cold desert soil microbiomes thrive despite severe moisture and nutrient limitations. In Eastern Antarctic soils, bacterial primary production is supported by trace gas oxidation and the light-independent RuBisCO form IE. This study aims to determine if atmospheric chemosynthesis is widespread within Antarctic, Arctic and Tibetan cold deserts, to identify the breadth of trace gas chemosynthetic taxa and to further characterize the genetic determinants of this process. H2 oxidation was ubiquitous, far exceeding rates reported to fulfill the maintenance needs of similarly structured edaphic microbiomes. Atmospheric chemosynthesis occurred globally, contributing significantly (p Chloroflexota, Firmicutes, Deinococcota and Verrucomicrobiota genomes. We identify a novel group of high-affinity [NiFe]-hydrogenases, group 1m, through phylogenetics, gene structure analysis and homology modeling, and reveal substantial genetic diversity within RuBisCO form IE (rbcL1E), and high-affinity 1h and 1l [NiFe]-hydrogenase groups. We conclude that atmospheric chemosynthesis is a globally-distributed phenomenon, extending throughout cold deserts, with significant implications for the global carbon cycle and bacterial survival within environmental reservoirs.
Databáze: OpenAIRE
Externí odkaz: