title: Mineral Type and Solution Chemistry Affect the Structure and Composition of Actively Growing Bacterial Communities as Revealed by Bromodeoxyuridine Immunocapture and 16S rRNA Pyrosequencing.
abstract: Understanding how minerals affect bacterial communities and their in situ activities in relation to environmental conditions are central issues in soil microbial ecology, as minerals represent essential reservoirs of inorganic nutrients for the biosphere. To determine the impact of mineral type and solution chemistry on soil bacterial communities, we compared the diversity, composition, and functional abilities of a soil bacterial community incubated in presence/absence of different mineral types (apatite, biotite, obsidian). Microcosms were prepared containing different liquid culture media devoid of particular essential nutrients, the nutrients provided only in the introduced minerals and therefore only available to the microbial community through mineral dissolution by biotic and/or abiotic processes. By combining functional screening of bacterial isolates and community analysis by bromodeoxyuridine DNA immunocapture and 16S rRNA gene pyrosequencing, we demonstrated that bacterial communities were mainly impacted by the solution chemistry at the taxonomic level and by the mineral type at the functional level. Metabolically active bacterial communities varied with solution chemistry and mineral type. Burkholderia were significantly enriched in the obsidian treatment compared to the biotite treatment and were the most effective isolates at solubilizing phosphorous or mobilizing iron, in all the treatments. A detailed analysis revealed that the 16S rRNA gene sequences of the OTUs or isolated strains assigned as Burkholderia in our study showed high homology with effective mineral-weathering bacteria previously recovered from the same experimental site.
authors.affiliation: INRA, UMR1136 "Interactions Arbres-Microorganismes", Centre INRA de Nancy, 54280, Champenoux, France.|Université de Lorraine, UMR1136 "Interactions Arbres-Microorganismes", 54500, Vandoeuvre-lès-Nancy, France.|School of Science and the Environment, Division of Biology and Conservation Ecology, Manchester Metropolitan University, M1 5GD, Manchester, UK.
authors.forename: L C
authors.initials: LC
authors.lastname: Kelly
authors.affiliation: INRA, UMR1136 "Interactions Arbres-Microorganismes", Centre INRA de Nancy, 54280, Champenoux, France.|Université de Lorraine, UMR1136 "Interactions Arbres-Microorganismes", 54500, Vandoeuvre-lès-Nancy, France.|INRA UR1138 "Biogéochimie des Ecosystèmes Forestiers", Centre INRA de Nancy, 54280, Champenoux, France.
authors.forename: Y
authors.initials: Y
authors.lastname: Colin
authors.affiliation: INRA UR1138 "Biogéochimie des Ecosystèmes Forestiers", Centre INRA de Nancy, 54280, Champenoux, France.
authors.forename: M-P
authors.initials: MP
authors.lastname: Turpault
authors.affiliation: INRA, UMR1136 "Interactions Arbres-Microorganismes", Centre INRA de Nancy, 54280, Champenoux, France. uroz@nancy.inra.fr.|Université de Lorraine, UMR1136 "Interactions Arbres-Microorganismes", 54500, Vandoeuvre-lès-Nancy, France. uroz@nancy.inra.fr.|INRA UR1138 "Biogéochimie des Ecosystèmes Forestiers", Centre INRA de Nancy, 54280, Champenoux, France. uroz@nancy.inra.fr.
authors.forename: S
authors.initials: S
authors.lastname: Uroz
mesh_terms: D001419:Bacteria / Q000145:classification* / Q000302:isolation & purification; D001681:Biological Assay; D001973:Bromodeoxyuridine; D004269:DNA, Bacterial / Q000235:genetics; D006863:Hydrogen-Ion Concentration; D008903:Minerals / Q000032:analysis; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D012987:Soil / Q000737:chemistry*; D012988:Soil Microbiology
chemical_list: D004269:DNA, Bacterial; D008903:Minerals; D012336:RNA, Ribosomal, 16S; D012987:Soil; D001973:Bromodeoxyuridine
keywords: 16S rDNA-based pyrosequencing; BrdU immunocapture; Culture-dependent approach; Forest soil; Minerals