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Applied and Environmental Microbiology, September 2008, p. 5792-5801, Vol. 74, No. 18
0099-2240/08/$08.00+0     doi:10.1128/AEM.01592-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Temporal Changes in the Ectomycorrhizal Community in Two Soil Horizons of a Temperate Oak Forest{triangledown} ,{dagger}

Pierre-Emmanuel Courty,1* Alain Franc,2 Jean-Claude Pierrat,3 and Jean Garbaye1

UMR 1136 INRA-Nancy Université, Interactions Arbres/Micro-organisms, INRA-Nancy, 54280 Champenoux, France,1 INRA Pierroton, UMR Biodiversité, Gènes et Communautés, 33612 Cestas, France,2 UMR 1092 INRA-ENGREF Etudes des Ressources Forêt/Bois, ENGREF Nancy, 54000 Nancy, France3

Received 11 July 2008/ Accepted 11 July 2008

The species structure of an ectomycorrhizal (ECM) community was assessed monthly for 15 months in the two horizons (A1 and A2) of an oak temperate forest in northeastern France. Ectomycorrhizal species were identified each month by internal transcribed spacer sequencing. Seventy-five fungal symbionts were identified. The community was dominated by Tomentellaceae, Russulaceae, Cortinariaceae, and Boletales. Four species are abundant in the study site: Lactarius quietus, Tomentella sublilacina, Cenococcum geophilum, and Russula sp1. The relative abundance of each species varied depending on the soil horizon and over time. Some species, such as L. quietus, were present in the A1 and A2 horizons. C. geophilum was located particularly in the A2 horizon, whereas T. sublilacina was more abundant in A1. Some species, such as Clavulina sp., were detected in winter, while T. sublilacina and L. quietus were present all year long. Our results support the hypothesis that a rapid turnover of species composition of the ECM community occurs over the course of a month. The spatial and temporal unequal distribution of ECM species could be explained by their ecological preferences, driven by such factors as root longevity, competition for resources, and resistance to environmental variability.

* Corresponding author. Mailing address: UMR 1136 INRA-Nancy Université, Interactions Arbres/Micro-organisms, INRA-Nancy, 54280 Champenoux, France. Phone: 33 3 83 39 40 41. Fax: 33 3 83 39 40 69. E-mail: courty{at}nancy.inra.fr

{triangledown} Published ahead of print on 25 July 2008.

{dagger} Supplemental material for this article may be found at http://aem.asm.org/.

Applied and Environmental Microbiology, September 2008, p. 5792-5801, Vol. 74, No. 18
0099-2240/08/$08.00+0     doi:10.1128/AEM.01592-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.





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