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Area of Science:

  • Microbiology
  • Plant Pathology
  • Symbiotic Interactions

Background:

  • Commensalism and mutualism often evolve from parasitic ancestors.
  • Rhizobium-legume interactions are typically studied as either symbiotic or pathogenic, not both on the same host.
  • Dual pathogenic and nodulating abilities in a single rhizobial strain on one host have not been previously documented.

Purpose of the Study:

  • To isolate and characterize a bacterial strain exhibiting both pathogenic and nodulating capabilities on legume hosts.
  • To investigate the genomic and phenotypic basis of this dual ability in rhizobia.
  • To identify bacterial clades associated with these mixed interaction phenotypes.

Main Methods:

  • Isolation of bacterial strains from Medicago nodules.
  • Phenotypic characterization of bacterial interactions with various legume genotypes.
  • Genomic analysis and phylogenetic clustering of isolated strains.
  • Comparative analysis with known rhizobial groups.

Main Results:

  • Isolation of the T4 strain from Medicago nodules, demonstrating dual pathogenic and nodulating abilities.
  • The T4 strain induced ineffective nodules competitively and acted as a parasite, causing plant death on specific legume genotypes.
  • This dual ability was observed across multiple legume species within the Inverted Repeat-Lacking Clade.
  • Genomic analysis placed T4 within the nonsymbiotic Ensifer adhaerens group, clustering with another strain (T173) possessing similar dual traits.
  • Identification of a distinct bacterial clade encompassing these dual-ability rhizobial strains.

Conclusions:

  • A novel bacterial clade of rhizobia has been identified, characterized by the ability to act as both a pathogen and a symbiont on the same legume host.
  • The outcome of the interaction is dependent on the developmental stage of the plant.
  • This discovery expands the understanding of the evolutionary pathways and phenotypic plasticity within rhizobium-legume interactions.