“Ectomycorrhizal exploration type” could be a functional trait explaining the spatial distribution of tree symbiotic fungi as a function of forest humus forms - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles Mycorrhiza Year : 2024

“Ectomycorrhizal exploration type” could be a functional trait explaining the spatial distribution of tree symbiotic fungi as a function of forest humus forms

Fadwa Khalfallah
  • Function : Author
  • PersonId : 1386785
Lucie Bon
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  • PersonId : 1386786
Mark R. Bakker
Nicolas Fanin
Richard Bellanger
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  • PersonId : 1386787
Catherine Ducatillon
  • Function : Author
  • PersonId : 1386788
Gâteblé Gildas
Vanguelova E.I.
  • Function : Author
Laurent Augusto
Marc Buée

Abstract

In European forests, most tree species form symbioses with ectomycorrhizal (EM) and arbuscular mycorrhizal (AM) fungi. The EM fungi are classified into different morphological types based on the development and structure of their extraradical mycelium. These structures could be root extensions that help trees to acquire nutrients. However, the relationship between these morphological traits and functions involved in soil nutrient foraging is still under debate.We described the composition of mycorrhizal fungal communities under 23 tree species in a wide range of climates and humus forms in Europe and investigated the exploratory types of EM fungi. We assessed the response of this tree extended phenotype to humus forms, as an indicator of the functioning and quality of forest soils. We found a significant relationship between the relative proportion of the two broad categories of EM exploration types (short- or long-distance) and the humus form, showing a greater proportion of long-distance types in the least dynamic soils. As past land-use and host tree species are significant factors structuring fungal communities, we showed this relationship was modulated by host trait (gymnosperms versus angiosperms), soil depth and past land use (farmland or forest).We propose that this potential functional trait of EM fungi be used in future studies to improve predictive models of forest soil functioning and tree adaptation to environmental nutrient conditions.
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hal-04592027 , version 1 (29-05-2024)

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Fadwa Khalfallah, Lucie Bon, Mohamed El Mazlouzi, Mark R. Bakker, Nicolas Fanin, et al.. “Ectomycorrhizal exploration type” could be a functional trait explaining the spatial distribution of tree symbiotic fungi as a function of forest humus forms. Mycorrhiza, 2024, ⟨10.1007/s00572-024-01146-8⟩. ⟨hal-04592027⟩
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