Responses of soil microbial catabolic diversity to arbuscular mycorrhizal inoculation and soil disinfection

Dabire A.P., Hien Victor, Bilgo Ablasse, Kisa Marija, Sangare K.S., Plenchette Christian, Galiana Antoine, Prin Yves, Duponnois Robin. 2007. Responses of soil microbial catabolic diversity to arbuscular mycorrhizal inoculation and soil disinfection. Mycorrhiza, 17 (6) : 537-545.

https://doi.org/10.1007/s00572-007-0126-5

Article de revue ; Article de revue à facteur d'impact

Version publiée - Anglais
Accès réservé aux personnels Cirad
Utilisation soumise à autorisation de l'auteur ou du Cirad.
document_541895.pdf
Télécharger (281kB)

Résumé : Although it is usually admitted that arbuscular mycorrhizal (AM) fungi are key components in soil bio-functioning, little is known on the response of microbial functional diversity to AM inoculation. The aims of the present study were to determine the influence of Glomus intraradices inoculum densities on plant growth and soil microflora functional diversity in autoclaved soil or non-disinfected soil. Microbial diversity of soil treatments was assessed by measuring the patterns of in situ catabolic potential of microbial communities. The soil disinfection increased sorghum growth, but lowered catabolic evenness (4.8) compared to that recorded in the non-disinfected soil (6.5). G. intraradices inoculation induced a higher plant growth in the autoclaved soil than in the non-disinfected soil. This AM effect was positively related to inoculum density. Catabolic evenness and richness were positively correlated with the number of inoculated AM propagules in the autoclaved soil, but negatively correlated in the non-disinfected soil. In addition, after soil disinfection and AM inoculation, these microbial functionality indicators had higher values than in the autoclaved or in the non-disinfected soil without AM inoculation. These results are discussed in relation to the ecological influence of AM inoculation, with selected fungal strains and their associated microflora on native soil microbial activity.

Mots-clés Agrovoc : mycorhizé à vésicule et arbuscule, inoculation, désinfection du sol, micro-organisme du sol, flore du sol, biodiversité, croissance, Sorghum bicolor, Glomus intraradices, facteur de risque, catabolisme, impact sur l'environnement