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Evolutionary diversification through hybridization in a wild host-pathogen interaction.

Luke G Barrett1, Peter H Thrall, Jeremy J Burdon

  • 1CSIRO Plant Industry, GPO Box 1600, Canberra, Australian Capital Territory, 2601, Australia. Luke.Barrett@csiro.au

Evolution; International Journal of Organic Evolution
|June 30, 2007
PubMed
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Coevolution varies across landscapes due to environmental factors. This study reveals how host-pathogen interactions, like Linum marginale and Melampsora lini, diversify through geographic selection and gene flow.

Area of Science:

  • Ecology
  • Evolutionary Biology
  • Plant Pathology

Background:

  • Coevolutionary dynamics are influenced by landscape-level variations in environmental conditions, gene flow, and selection pressures.
  • Understanding these dynamics is crucial for predicting species interactions across diverse geographic regions.

Purpose of the Study:

  • To investigate how environmental heterogeneity, genetic divergence, and regional adaptation shape coevolutionary processes.
  • To analyze the plant-pathogen interaction between Linum marginale (host) and Melampsora lini (pathogen) across Australia.

Main Methods:

  • Employed a combination of molecular, experimental, and field-based approaches.
  • Analyzed genetic divergence and geographic distribution of pathogen lineages.
  • Assessed host resistance diversity and mating systems in relation to pathogen characteristics.

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Main Results:

  • Identified two genetically and geographically distinct pathogen lineages of Melampsora lini in Australia.
  • Demonstrated a hybrid origin for one of these pathogen lineages.
  • Linked geographic divergence of pathogen lineages to variations in virulence, life-history traits, and environmental responses.

Conclusions:

  • Geographic selection and gene flow contribute to coevolutionary diversification in long-standing host-pathogen systems.
  • Environmental heterogeneity and regional adaptation play significant roles in shaping coevolutionary outcomes.
  • The Linum marginale-Melampsora lini interaction provides a model for understanding landscape-driven coevolution.