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First report of ectomycorrhizae in Prunus serotina in the exotic range

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Abstract

Purpose

Prunus serotina is a tree species native to north America which successfully invades European temperate forests. In the native range, it forms arbuscular mycorrhizae (AM), but few data are available in the exotic range. We thus investigated root-fungi interactions in several deciduous forests of northern France.

Methods

We sampled P. serotina roots in six sites with contrasted soil, canopy composition and invasion history conditions. We combined macroscopic and microscopic observations of coloured root sections with molecular analyses to document the type and identity of mycorrhizae.

Results

We evidenced characteristic structures of ectomycorrhizae (ECM) (mantles and Hartig nets) in the same roots as AM-like structures. Molecular analyses retrieved several native and exotic ECM fungal species, in particular Piloderma fallax and Xerocomellus macmurphyi. ECM species richness was the highest in sites with the longest history of invasion.

Conclusions

P. serotina is proven a dual-mycorrhizal species in the exotic range, forming both AM and ECM. This may enable it to exploit a large range of soil resources, but also to connect to the common mycorrhizal network of ECM-dominated European temperate forest, according to the “enhanced mutualism hypothesis”, thereby explaining its successful invasion.

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Data availability

Metabarcoding data associated with this study has been deposited in the NCBI Sequence Read Archive under accession number PRJNA835666.

References

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Acknowledgements

We thank Aurélie Deveau for helpful discussion on ECM characterization, Déborah Closset, Thomas Kichey, Jonathan Lenoir and Fabien Spicher for helping in fine root sample collection.

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Authors and Affiliations

Authors

Contributions

AF conducted preliminary field work and exploratory analyses. JD performed molecular analyses. FD performed microscopic analyses. GD designed the study and led the writing. AF, FD and GD collected data and samples in the field. All authors contributed to the writing and approved the final version of the manuscript.

Corresponding author

Correspondence to Guillaume Decocq.

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Disclosure

The authors have no relevant financial or non-financial interests to disclose.

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Responsible Editor: Tarja Lehto.

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Fruleux, A., Duclercq, J., Dubois, F. et al. First report of ectomycorrhizae in Prunus serotina in the exotic range. Plant Soil 484, 171–181 (2023). https://doi.org/10.1007/s11104-022-05780-z

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  • DOI: https://doi.org/10.1007/s11104-022-05780-z

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