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Combined bromodeoxyuridine immunocapture and terminal-restriction fragment length polymorphism analysis highlights differences in the active soil bacterial metagenome due to Glomus mosseae inoculation or plant species.

High numbers of bacteria are associated with arbuscular mycorrhizal (AM) fungi, but their functions and in situ activities are largely unknown and most have never been characterized. The aim of the present study was to study the impact of Glomus mosseae inoculation and plant type on the active bacterial communities in soil by using a molecular approach, bromodeoxyuridine (BrdU) immunocapture in combination with terminal-restriction fragment length polymorphism (T-RFLP). This approach combined with sequence information from clone libraries, enabled the identification of actively growing populations, within the total bacterial community. Distinct differences in active bacterial community compositions were found according to G. mosseae inoculation, treatment with an antifungal compound (Benomyl) and plant type. The putative identities of the dominant bacterial species that were activated as a result of G. mosseae inoculation were found to be mostly uncultured bacteria and Paenibacillus species. These populations may represent novel bacterial groups that are able to influence the AM relationship and its subsequent effect on plant growth.