| DOI | Resolve DOI: https://doi.org/10.1128/AEM.00275-17 |
|---|
| Author | Search for: Khdhiri, Mondher; Search for: Piché-Choquette, Sarah; Search for: Tremblay, Julien1; Search for: Tringe, Susannah G.; Search for: Constant, Philippe |
|---|
| Editor | Search for: Müller, Volker |
|---|
| Affiliation | - National Research Council of Canada. Energy, Mining and Environment
|
|---|
| Format | Text, Article |
|---|
| Subject | biogeochemistry; microbial ecology; soil microbiology; trace gas |
|---|
| Abstract | The enrichment of H2-oxidizing bacteria (HOB) by H2 generated by nitrogen-fixing nodules has been shown to have a fertilization effect on several different crops. The benefit of HOB is attributed to their production of plant growth-promoting factors, yet their interactions with other members of soil microbial communities have received little attention. Here we report that the energy potential of H2, when supplied to soil, alters ecological niche partitioning of bacteria and fungi, with multifaceted consequences for both generalist and specialist microbial functions. We used dynamic microcosms to expose soil to the typical atmospheric H2 mixing ratio (0.5 ppmv) permeating soils, as well as mixing ratios comparable to those found at the soil-nodule interface (10,000 ppmv). Elevated H2 exposure exerted direct effects on two HOB subpopulations distinguished by their affinity for H2 while enhancing community level carbon substrate utilization potential and lowering CH4 uptake activity in soil. We found that H2 triggered changes in the abundance of microorganisms that were reproducible yet inconsistent across soils at the taxonomic level and even among HOB. Overall, H2 exposure altered microbial process rates at an intensity that depends upon soil abiotic and biotic features. We argue that further examination of direct and indirect effects of H2 on soil microbial communities will lead to a better understanding of the H2 fertilization effect and soil biogeochemical processes. |
|---|
| Publication date | 2017-03-31 |
|---|
| Publisher | American Society for Microbiology |
|---|
| In | |
|---|
| Language | English |
|---|
| Peer reviewed | Yes |
|---|
| NPARC number | 23003395 |
|---|
| Export citation | Export as RIS |
|---|
| Report a correction | Report a correction (opens in a new tab) |
|---|
| Record identifier | ea276f74-d286-4dff-bdee-4e013631351f |
|---|
| Record created | 2018-06-14 |
|---|
| Record modified | 2020-03-16 |
|---|
