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Ecosystem screening approach for pathogen-associated microorganisms affecting host disease.

Eric Galiana1, Antoine Marais, Catherine Mura

  • 1Institut National de la Recherche Agronomique, Unité Mixte de Recherche 1301 Interactions Biotiques et Santé Végétale, F-06903 Sophia Antipolis, France. galiana@sophia.inra.fr

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Summary

A new screening method identifies microbial species that influence plant disease. This research found a Vorticella species disseminates pathogens and a Phoma species suppresses disease by inhibiting pathogen germination.

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Area of Science:

  • Microbiology
  • Plant Pathology
  • Ecology

Background:

  • The microbial community is crucial for pathogen evolution and disease severity.
  • Interactions between species on host surfaces influence pathogen inoculum but are poorly understood.
  • Characterizing these interactions is vital for understanding disease dynamics.

Purpose of the Study:

  • To develop and validate a novel screening method for identifying microbial species that affect plant disease.
  • To characterize the roles of rhizosphere microbes in the disease cycle of Phytophthora parasitica.
  • To define microbial species as disease promoters or suppressors within a specific biotope.

Main Methods:

  • A three-step screening strategy using the pathogen as a trap and pathogen extracts as a nutrient source.
  • Constitution of the microbial community, community selection, and molecular identification of isolates.
  • In vitro and in vivo screening of isolates for their effects on pathogen growth and host disease.

Main Results:

  • Two eukaryotic species from the tobacco rhizosphere significantly interfered with the Phytophthora parasitica life cycle.
  • A Vorticella species exhibited mutualistic interaction, aiding pathogen dissemination from biofilms.
  • A Phoma species demonstrated amensal interaction, suppressing disease by inhibiting pathogen germination.

Conclusions:

  • The developed screening method effectively identifies microbial species influencing plant disease, applicable to nonobligate pathogens.
  • This approach defines microbial roles as disease promoters or suppressors, aiding ecological and evolutionary studies of pathogens.
  • Understanding these microbial relationships is key to managing plant diseases and understanding pathogen evolution.