Publications by authors named "Anne de la Porte"

2 Publications

  • Page 1 of 1

A Gaseous Milieu: Extending the Boundaries of the Rhizosphere.

Trends Microbiol 2020 07 26;28(7):536-542. Epub 2020 Mar 26.

Institut National de la Recherche Scientifique, Centre Armand-Frappier Santé Biotechnologie, Laval, H7V 1B7, Canada; Quebec Center for Biodiversity Sciences (QCBS), Montreal, H3A 1B1, Canada.

Plant root activities shape microbial community functioning in the soil, making the rhizosphere the epicenter of soil biogeochemical processes. With this opinion article, we argue to rethink the rhizosphere boundaries: as gases can diffuse several centimeters away from the roots into the soil, the portion of soil influenced by root activities is larger than the strictly root-adhering soil. Indeed, gases are key drivers of biogeochemical processes due to their roles as energy sources or communication molecules, which has the potential to modify microbial community structure and functioning. In order to get a more holistic perspective on this key environment, we advocate for interdisciplinarity in rhizosphere research by combining knowledge of soluble compounds with gas dynamics.
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July 2020

Biological H and CO oxidation activities are sensitive to compositional change of soil microbial communities.

Can J Microbiol 2020 Apr 30;66(4):263-273. Epub 2020 Jan 30.

Institut national de la recherche scientifique, Centre Armand Frappier Santé Biotechnologie, 531 boulevard des Prairies, Laval, QC H7V 1B7, Canada.

Trace gas uptake by microorganisms controls the oxidative capacity of the troposphere, but little is known about how this important function is affected by changes in soil microbial diversity. This article bridges that knowledge gap by examining the response of the microbial community-level physiological profiles (CLPPs), carbon dioxide (CO) production, and molecular hydrogen (H) and carbon monoxide (CO) oxidation activities to manipulation of microbial diversity in soil microcosms. Microbial diversity was manipulated by mixing nonsterile and sterile soil with and without the addition of antibiotics. Nonsterile soil without antibiotics was used as a reference. Species composition changed significantly in soil microcosms as a result of dilution and antibiotic treatments, but there was no difference in species richness, according to PCR amplicon sequencing of the bacterial 16S rRNA gene. The CLPP was 15% higher in all dilution and antibiotic treatments than in reference microcosms, but the dilution treatment had no effect on CO production. Soil microcosms with dilution treatments had 58%-98% less H oxidation and 54%-99% lower CO oxidation, relative to reference microcosms, but did not differ among the antibiotic treatments. These results indicate that H and CO oxidation activities respond to compositional changes of microbial community in soil.
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April 2020