H 2 -saturation of high affinity H 2 -oxidizing bacteria alters the ecological niche of soil microorganisms unevenly among taxonomic groups

PeerJ

article

Sarah Piché-Choquette¹  Julien Tremblay²  Susannah G. Tringe³  Philippe Constant¹ 

[1] INRS-Institut Armand-Frappier;Biomonitoring, National Research Council Canada;DOE Joint Genome Institute

关键词: Soil;    Microbial ecology;    Correlation network;   

DOI  :  10.7717/peerj.1782

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

Soil microbial communities are continuously exposed to H2 diffusing into the soil from the atmosphere. N2-fixing nodules represent a peculiar microniche in soil where H2 can reach concentrations up to 20,000 fold higher than in the global atmosphere (0.530 ppmv). In this study, we investigated the impact of H2 exposure on soil bacterial community structure using dynamic microcosm chambers simulating soil H2 exposure from the atmosphere and N2-fixing nodules. Biphasic kinetic parameters governing H2 oxidation activity in soil changed drastically upon elevated H2 exposure, corresponding to a slight but significant decay of high affinity H2-oxidizing bacteria population, accompanied by an enrichment or activation of microorganisms displaying low-affinity for H2. In contrast to previous studies that unveiled limited response by a few species, the relative abundance of 958 bacterial ribotypes distributed among various taxonomic groups, rather than a few distinct taxa, was influenced by H2 exposure. Furthermore, correlation networks showed important alterations of ribotype covariation in response to H2 exposure, suggesting that H2 affects microbe-microbe interactions in soil. Taken together, our results demonstrate that H2-rich environments exert a direct influence on soil H2-oxidizing bacteria in addition to indirect effects on other members of the bacterial communities.

【 授权许可】

CC BY