Bernard Laetitia auteur aut IRD Chapuis Lardy Lydie auteur aut IRD Razafimbelo T. auteur aut IRD Razafindrakoto M. auteur aut IRD Pablo Anne-Laure auteur aut IRD Legname E. auteur aut IRD Poulain J. auteur aut IRD Bruls T. auteur aut IRD O'Donohue M. auteur aut IRD Brauman Alain auteur aut IRD Chotte Jean-Luc auteur aut IRD Blanchart Eric auteur aut IRD text journalArticle eng text/pdf born digital access 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 (13)C wheat straw residue, in the presence or absence of a peregrine endogeic tropical earthworm, Pontoscolex corethrurus. Emissions of (12)CO(2) and (13)CO(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. The ISME Journal (2012) 6, 213-222; doi:10.1038/ismej.2011.87; published online 14 July 2011 specialized Bacteroidetes DNA-SIP Madagascar Pontoscolex corethrurus priming effect pyrosequencing MADAGASCAR 074 068 6 1 213-222 2012 1751-7362 https://www.documentation.ird.fr/hor/fdi:010054301 10.1038/ismej.2011.87 1751-7362 [F B010054301] https://www.documentation.ird.fr/hor/fdi:010054301 https://www.documentation.ird.fr/intranet/publi/2012/01/010054301.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2012-02-01 2017-08-23 fdi:010054301 fre