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G Schwob1, M Roy2, A C Pozzi3,4

  • 1Laboratoire d'Écologie Microbienne, UMR 5557, CNRS, INRA, VetAgro Sup, Université Lyon 1, Université de Lyon, Villeurbanne, France guillaume_schwob@hotmail.fr.

Applied and Environmental Microbiology
|September 16, 2018
PubMed
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Spore-positive (Sp+) Frankia strains, common in highlands, show a narrower host range and influence ectomycorrhizal communities differently than spore-negative (Sp-) strains. Soil history and Frankia sporulation type shape alder symbiosis in the Holarctic region.

Area of Science:

  • Microbial Ecology
  • Plant-Microbe Interactions
  • Symbiotic Relationships

Background:

  • Alnus species form symbioses with Frankia bacteria and ectomycorrhizal fungi.
  • Two Frankia lineages exist: spore-positive (Sp+) and spore-negative (Sp-), with distinct geographical distributions and sporulation abilities.
  • Sp+ strains are prevalent in highlands on Alnus incana and Alnus viridis, while Sp- strains are found in lowlands on Alnus glutinosa.

Purpose of the Study:

  • Investigate if Sp+ Frankia predominance in nodules results from host selection or soil ecological history.
  • Determine the effect of Frankia sporulation genotype on ectomycorrhizal (ECM) communities.
  • Elucidate biogeographical drivers of alder symbionts in the Holarctic region.

Main Methods:

  • Conducted Frankia trapping experiments using Alnus plantlets on soils with varying alder species and Sp+ nodule frequencies.
Keywords:
AlnusFrankiaactinorhizal symbiosisectomycorrhizaehost specificityin planta sporulation

Related Experiment Videos

  • Analyzed Frankia diversity and Sp+ frequencies in trapped nodules.
  • Assessed nodulation impediments and ECM community composition based on Frankia genotype and host plant.

    • Main Results:

    • Trapping revealed higher Frankia diversity and Sp+ frequency variations than observed in natural fields.
    • Nodulation impediments in Sp+ soils suggest a narrower host range for Sp+ Frankia.
    • Frankia sporulation genotype significantly influenced ECM communities, with no observed host shift for Alnus-specific ECM.

    Conclusions:

    • Symbiotic associations between Alnus, Frankia, and ECM fungi are determined by host range, soil history, and Frankia in planta species type.
    • The sporulation genotype of Frankia spp. plays a crucial role in shaping ECM communities.
    • Understanding Sp+ Frankia biogeography offers insights into the ecological role of in planta sporulation and host-partner interactions.