Multi-host ectomycorrhizal fungi are predominant in a Guinean tropical rainforest and shared between canopy trees and seedlings

Diédhiou Abadala Gamby, Selosse Marc-André, Galiana Antoine, Diabaté Moussa, Dreyfus Bernard, Bâ Amadou Moustapha, Miana de Faria Sergio, Béna Gilles. 2010. Multi-host ectomycorrhizal fungi are predominant in a Guinean tropical rainforest and shared between canopy trees and seedlings. Environmental Microbiology, 12 (8) : 2219-2232.

Quartile : Q1, Sujet : MICROBIOLOGY

Résumé : The diversity of ectomycorrhizal (ECM) fungi on adult trees and seedlings of five species, Anthonotha fragrans, Anthonotha macrophylla, Cryptosepalum tetraphyllum, Paramacrolobium coeruleum and Uapaca esculenta, was determined in a tropical rain forest of Guinea. Ectomycorrhizae were sampled within a surface area of 1600 m2, and fungal taxa were identified by sequencing the rDNA Internal Transcribed Spacer region. Thirty-nine ECM fungal taxa were determined, of which 19 multi-hosts, 9 single-hosts and 11 singletons. The multi-host fungi represented 92% (89% when including the singletons in the analysis) of the total abundance. Except for A. fragrans, the adults of the host species displayed significant differentiation for their fungal communities, but their seedlings harboured a similar fungal community. These findings suggest that there was a potential for the formation of common mycorrhizal networks in close vicinity. However, no significant difference was detected for the d13C and d15N values between seedlings and adults of each ECM plant, and no ECM species exhibited signatures of mixotrophy. Our results revealed (i) variation in ECM fungal diversity according to the seedling versus adult development stage of trees and (ii) low host specificity of ECM fungi, and indicated that multi-host fungi are more abundant than single-host fungi in this forest stand.

Mots-clés Agrovoc : forêt tropicale humide, Mycorhizé, Euphorbiaceae, ectomycorhize

Mots-clés géographiques Agrovoc : Guinée

Mots-clés complémentaires : Anthonotha, Cryptosepalum, Uapaca

Classification Agris : F62 - Physiologie végétale - Croissance et développement
P34 - Biologie du sol
K01 - Foresterie - Considérations générales

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

• Diédhiou Abadala Gamby, LSTM (FRA)
• Selosse Marc-André, Centre national de la recherche scientifique (FRA)
• Galiana Antoine, CIRAD-BIOS-UMR LSTM (FRA) ORCID: 0000-0002-5293-5049
• Diabaté Moussa, IRAG (GIN)
• Dreyfus Bernard, IRD (FRA)
• Bâ Amadou Moustapha, UAG (GLP)
• Miana de Faria Sergio, EMBRAPA (BRA)
• Béna Gilles, LSTM (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/556665/)

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