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Abstract Detail

MSA - Ecology/Pathology

Rochet, Juliette [1], Moreau, Pierre-Arthur [2], Jargeat, Patricia [1], Gryta, Hervé [1], Chassagne, François [1], Gardes, Monique [1].

Host identity is a major driver of community of ectomycorrhizal fungi in the genus Alnus.

The genus Alnus (Betulaceae) is unusual in that all the species of alders form a tripartite symbiosis with arbuscular and ectomycorrhizal (ECM) fungi and nitrogen-fixing actinobacteria (Frankia). Numerous fruitbodies surveys in Europe have revealed species-poor ECM communities and high degree of tree-fungus specificity compared with other tree species. The aims of the present study were 1- to examine whether the below ground view of the ECM community deviates from the above ground view in total richness, composition and distribution of species, and 2- from the observed results to infer the key drivers of the tree-fungus specificity in this model system. Our study was conducted in France where the genus Alnus is present as five woody or shrubby species. Alnus glutinosa has a cosmopolitan distribution while A. cordata, A. viridis spp. suaveolens are restricted to Corsica and A.viridis ssp viridis, and A. incana are restricted to the Alps. Sequence analysis of the rDNA internal transcribed spacer (ITS) was performed on ectomycorrhizae collected from roots of the five alder species and a total of sixty trees. In all, twenty-five communities from Corsica, the Alps and ten localities from Southern France were characterized. Our results confirm the low diversity in ECM communities and reveal the predominance of genera of Alnicola and Thelephora at each study site. A significant effect of host identity on community structure was detected whereas site locality was not a driver of the ECM diversity. Together, our results suggest strong patterns of host specificity and co-adaptation between the symbionts.

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1 - Université Toulouse 3 Paul Sabatier, Evolution & Diversité Biologique, 118 route de Narbonne, Bat 4R3, Toulouse, 31062, France
2 - Université Lille 2, Faculté de Pharmacie, Laboratoire de Botanique, 3 rue du Professeur Laguesse, Lille, 59006, France

Alnus spp
ectomycorrhizal fungi
host specificity
community structure.

Presentation Type: Poster:Posters for Topics
Session: P2
Location: Event Tent/Cliff Lodge
Date: Tuesday, July 28th, 2009
Time: 5:30 PM
Number: P2EP024
Abstract ID:533