Ectomycorrhizal fungi are shared between seedlings and adults in a monodominant Gilbertiodendron dewevrei rain forest in Cameroon |
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| Authors: | Adrien Taudière Nogaye Niang Cheikh Ndiaye Mathieu Sauve Nérée Onguene Awana Mieke Verbeken André De Kesel Seynabou Séne Abdala G Diédhiou Violette Sarda Omar Sadio Maïmouna Cissoko Ibrahima Ndoye Amadou M Bâ |
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| Affiliation: | 1. UMR 5175, CEFE – CNRS – Université de Montpellier – Université Paul Valéry Montpellier – EPHE, Montpellier, France;2. Laboratoire Commun de Microbiologie, IRD/UCAD/ISRA, Dakar, Sénégal;3. Soil, Water and Atmosphere Department, Institute of Agriculture Research for Development, Yaoundé, Cameroon;4. Department of Biology, Ghent University, Ghent, Belgium;5. Botanic Garden Meise, Meise, Belgium;6. IRD, UMR 195 LEMAR (UBO/CNRS/IRD/Ifremer), Dakar, Sénégal;7. Laboratoire des Symbioses Tropicales et Méditerranéennes, UMR113‐ INRA/AGRO‐M/CIRAD/IRD/UM2‐TA10/J, Montpellier Cedex 5, France;8. Laboratoire de Biologie et Physiologie Végétales, Faculté des Sciences Exactes et Naturelles, Université des Antilles, Pointe‐à‐Pitre, Guadeloupe, FranceThese authors equally contributed to this work. |
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| Abstract: | Ectomycorrhizal networks may facilitate the establishment and survival of seedlings regenerating under the canopies of tropical forests and are often invoked as a potential contributor to monodominance. We identified ectomycorrhizal fungi in a monodominant Gilbertiodendron dewevrei (Fabaceae) rain forest in Cameroon, using sporocarps and ectomycorrhizae of three age categories (seedlings, intermediate trees, and large trees) and tentatively revealed nutrient transfer through ectomycorrhizal networks by measuring spontaneous isotopic (13C and 15N) abundances in seedlings. Sporocarp surveys revealed fewer ectomycorrhizal fungal taxa (59 species from 1030 sporocarps) than molecular barcoding of ectomycorrhizal roots (75 operational taxonomic units from 828 ectomycorrhizae). Our observations suggest that ectomycorrhizal fungal diversity is similar to that in other mixed tropical forests and provide the first report of the Tuber‐Helvella lineage in a tropical forest. Despite some differences, all age categories of G. dewevrei had overlapping ectomycorrhizal fungal communities, with families belonging to Thelephoraceae, Russulaceae, Sebacinaceae, Boletaceae, and Clavulinaceae. Of the 49 operational taxonomic units shared by the three age categories (65.3% of the ectomycorrhizal fungal community), 19 were the most abundant on root tips of all categories (38.7% of the shared taxa), supporting the likelihood of ectomycorrhizal networks. However, we obtained no evidence for nutrient transfer from trees to seedlings. We discuss the composition of the ectomycorrhizal fungal community among the G. dewevrei age categories and the possible role of common ectomycorrhizal networks in this rain forest. |
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| Keywords: | 13C 15N Caesalpinioideae common ectomycorrhizal network ectomycorrhiza Fabaceae subfamily internal transcribed spacer sporocarps |
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