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Helper bacteria and pathogenicity assessments.

A C Newton1, I K Toth1

  • 11 Fungal and Bacterial Plant Pathology Department, Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, Scotland, UK.

The New Phytologist
|April 17, 2021
PubMed
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Non-pathogenic bacteria can assist harmful pathogens in infecting plants. This study provides evidence that these bacteria, often overlooked, actively aid pathogen success, challenging assumptions of benign or competitive interactions.

Area of Science:

  • Plant pathology
  • Microbial ecology
  • Plant-microbe interactions

Background:

  • Pathogens interact with diverse organisms in their ecological environment.
  • Associated bacteria are often presumed to be benign or competitive.
  • Difficulties in pathogen isolation suggest complex interactions.

Purpose of the Study:

  • To investigate the role of associated bacteria in plant disease development.
  • To determine if non-pathogenic bacteria assist pathogens in host infection.

Main Methods:

  • Experimental evidence presented in Dewey et al. (this issue) was utilized.
  • Observational data on bacterial associations during pathogen isolation were considered.

Main Results:

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  • Clear evidence demonstrates that associated bacteria are not always benign or competitive.
  • These bacteria actively assist pathogens in successfully infecting host plants.
  • This assistance occurs even when the bacteria are not pathogens of the host themselves.

Conclusions:

  • The ecological role of associated bacteria in plant diseases is more complex than previously assumed.
  • Non-pathogenic bacteria can act as beneficial symbionts for plant pathogens.
  • Rethinking microbial interactions is crucial for understanding plant disease.