Abstract
We studied belowground and aboveground diversity and distribution of ectomycorrhizal (EM) fungal species colonizing Coccoloba uvifera (L.) L. (seagrape) mature trees and seedlings naturally regenerating in four littoral forests of the Guadeloupe island (Lesser Antilles). We collected 546 sporocarps, 49 sclerotia, and morphotyped 26,722 root tips from mature trees and seedlings. Seven EM fungal species only were recovered among sporocarps (Cantharellus cinnabarinus, Amanita arenicola, Russula cremeolilacina, Inocybe littoralis, Inocybe xerophytica, Melanogaster sp., and Scleroderma bermudense) and one EM fungal species from sclerotia (Cenococcum geophilum). After internal transcribed spacer (ITS) sequencing, the EM root tips fell into 15 EM fungal taxa including 14 basidiomycetes and 1 ascomycete identified. Sporocarp survey only weakly reflected belowground assessment of the EM fungal community, although 5 fruiting species were found on roots. Seagrape seedlings and mature trees had very similar communities of EM fungi, dominated by S. bermudense, R. cremeolilacina, and two Thelephoraceae: shared species represented 93 % of the taxonomic EM fungal diversity and 74 % of the sampled EM root tips. Furthermore, some significant differences were observed between the frequencies of EM fungal taxa on mature trees and seedlings. The EM fungal community composition also varied between the four investigated sites. We discuss the reasons for such a species-poor community and the possible role of common mycorrhizal networks linking seagrape seedlings and mature trees in regeneration of coastal forests.
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Acknowledgments
This research was funded by The Region of Guadeloupe. Part of the sequencing work was done using the grant “Diversité des champignons mycorhiziens des plantes” (DivMyc, to M.-A. Selosse) from the network Bibliothèque Du Vivant funded by the CNRS, the Museum National d’HistoireNaturelle and the INRA. We thank Jean Chabrol for help with sampling and identification of sporocarps, Marie-Pierre Dubois and Mathieu Sauve for help with the molecular typing, David Marsh for English corrections, and two anonymous referees for their comments. S. Séne received grants from the Institut de Recherche pour le Développement (IRD), the Ministry of Education and Researchof Senegal and the World Federation of Scientists (WFS).
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Séne, S., Avril, R., Chaintreuil, C. et al. Ectomycorrhizal fungal communities of Coccoloba uvifera (L.) L. mature trees and seedlings in the neotropical coastal forests of Guadeloupe (Lesser Antilles). Mycorrhiza 25, 547–559 (2015). https://doi.org/10.1007/s00572-015-0633-8
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DOI: https://doi.org/10.1007/s00572-015-0633-8