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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Endogeic earthworms shape bacterial functional communities and affect organic matter mineralization in a tropical soil
ISME Journal, Volume 6, No. 1, Year 2012
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Description
Priming effect (PE) is defined as a stimulation of the mineralization of soil organic matter (SOM) following a supply of fresh organic matter. This process can have important consequences on the fate of SOM and on the management of residues in agricultural soils, especially in tropical regions where soil fertility is essentially based on the management of organic matter. Earthworms are ecosystem engineers known to affect the dynamics of SOM. Endogeic earthworms ingest large amounts of soil and assimilate a part of organic matter it contains. During gut transit, microorganisms are transported to new substrates and their activity is stimulated by (i) the production of readily assimilable organic matter (mucus) and (ii) the possible presence of fresh organic residues in the ingested soil. The objective of our study was to see (i) whether earthworms impact the PE intensity when a fresh residue is added to a tropical soil and (ii) whether this impact is linked to a stimulation/inhibition of bacterial taxa, and which taxa are affected. A tropical soil from Madagascar was incubated in the laboratory, with a 13C wheat straw residue, in the presence or absence of a peregrine endogeic tropical earthworm, Pontoscolex corethrurus. Emissions of 12CO2 and 13CO 2 were followed during 16 days. The coupling between DNA-SIP (stable isotope probing) and pyrosequencing showed that stimulation of both the mineralization of wheat residues and the PE can be linked to the stimulation of several groups especially belonging to the Bacteroidetes phylum. © 2012 International Society for Microbial Ecology All rights reserved.
Available Materials
https://efashare.b-cdn.net/share/pmc/articles/PMC3246243/bin/ismej201187x1.doc
https://efashare.b-cdn.net/share/pmc/articles/PMC3246243/bin/ismej201187x2.doc
https://efashare.b-cdn.net/share/pmc/articles/PMC3246243/bin/ismej201187x3.doc
https://efashare.b-cdn.net/share/pmc/articles/PMC3246243/bin/ismej201187x4.tif
https://efashare.b-cdn.net/share/pmc/articles/PMC3246243/bin/ismej201187x5.tif
Authors & Co-Authors
Bernard, Laëtitia
Unknown Affiliation
Chapuis-Lardy, Lydie
Unknown Affiliation
Razafimbelo, Tantely Maminiaina
Unknown Affiliation
Razafindrakoto, Malalatiana Antoinette
Unknown Affiliation
Pablo, Anne Laure
Unknown Affiliation
Legname, Elvire
Unknown Affiliation
Poulain, Julie
Unknown Affiliation
Bruls, Thomas
Unknown Affiliation
O'Donohue, Michael
Unknown Affiliation
Brauman, Alain
Unknown Affiliation
Chotte, Jean Luc
Unknown Affiliation
Blanchart, Éric
Unknown Affiliation
Statistics
Citations: 180
Authors: 12
Affiliations: 6
Identifiers
Doi:
10.1038/ismej.2011.87
ISSN:
17517362
Research Areas
Genetics And Genomics
Sexual And Reproductive Health
Study Locations
Madagascar