Temporal changes of bacterial communities in the Tuber melanosporum ectomycorrhizosphere during ascocarp development

Mycorrhiza - Tập 26 - Trang 389-399 - 2016
Aurélie Deveau1,2, Sanjay Antony-Babu1,2,3, François Le Tacon1,2, Christophe Robin4,5, Pascale Frey-Klett1,2, Stéphane Uroz1,2,6
1UMR1136 INRA Université de Lorraine, Interactions Arbres – Microorganismes, Champenoux, France
2Université de Lorraine, UMR1136, Interactions Arbres – Microorganismes, Vandœuvre-lès-Nancy, France
3Department of Food Science and Technology, University of Nebraska-Lincoln, Lincoln, USA
4Université de Lorraine, UMR 1121, Agronomie & Environnement, Nancy-Colmar, Vandœuvre-lès-Nancy, France
5INRA, UMR 1121, Agronomie & Environnement, Nancy-Colmar, Centre INRA de Nancy-Lorraine, Vandœuvre-lès-Nancy, France
6INRA, UR1138, Biogéochimie des écosystèmes forestiers, Champenoux, France

Tóm tắt

Ectomycorrhizae create a multitrophic ecosystem formed by the association between tree roots, mycelium of the ectomycorrhizal fungus, and a complex microbiome. Despite their importance in the host tree’s physiology and in the functioning of the ectomycorrhizal symbiosis, detailed studies on ectomycorrhiza-associated bacterial community composition and their temporal dynamics are rare. Our objective was to investigate the composition and dynamics of Tuber melanosporum ectomycorrhiza-associated bacterial communities from summer to winter seasons in a Corylus avellana tree plantation. We used 16S ribosomal RNA (rRNA)-based pyrosequencing to compare the bacterial community structure and the richness in T. melanosporum’s ectomycorrhizae with those of the bulk soil. The T. melanosporum ectomycorrhizae harbored distinct bacterial communities from those of the bulk soil, with an enrichment in Alpha- and Gamma-proteobacteria. In contrast to the bacterial communities of truffle ascocarps that vastly varies in composition and richness during the maturation of the fruiting body and to those from the bulk soil, T. melanosporum ectomycorrhiza-associated bacterial community composition stayed rather stable from September to January. Our results fit with a recent finding from the same experimental site at the same period that a continuous supply of carbohydrates and nitrogen occurs from ectomycorrhizae to the fruiting bodies during the maturation of the ascocarps. We propose that this creates a stable niche in the ectomycorrhizosphere although the phenology of the tree changes.

Tài liệu tham khảo

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