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Area of Science:

  • Evolutionary biology
  • Plant pathology
  • Microbial ecology

Background:

  • Vector-borne plant pathogens exhibit complex virulence evolution dynamics.
  • Understanding these dynamics is crucial for managing plant diseases.

Purpose of the Study:

  • To investigate how genetic trade-offs and population structure influence virulence evolution in vector-borne plant pathogens.
  • To explore short-term virulence evolution via antagonistically pleiotropic alleles in host and vector environments.
  • To gain insights into virulence evolution in *Xylella fastidiosa*.

Main Methods:

  • Individual-based, quantitative-genetic simulations were employed.
  • The model considered generic parameters inspired by *Xylella fastidiosa* ecology.
  • Analysis focused on pathogen performance within hosts and vectors.

Main Results:

  • Selection in the vector environment can induce correlational, potentially non-adaptive, virulence changes in the host.
  • The extent of virulence evolution is influenced by transmission rate, host/vector population proportions, and selection strengths.
  • Strong within-vector selection can dominate short-term virulence evolution, even in host-predominant populations.

Conclusions:

  • Vector environment selection plays a significant role in virulence evolution, irrespective of pathogen prevalence in hosts.
  • Antagonistic pleiotropy and population structure are key drivers of virulence dynamics.
  • Short-term virulence evolution can be complex and influenced by interactions between host and vector environments.