EVOLUTIONARY DIVERSIFICATION THROUGH HYBRIDIZATION IN A WILD HOST–PATHOGEN INTERACTION

Coevolutionary outcomes between interacting species are predicted to vary across landscapes, as environmental conditions, gene flow, and the strength of selection vary among populations. Using a combination of molecular, experimental, and field approaches, we describe how broad-scale patterns of env...

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Bibliographic Details
Published in:Evolution 2007-07, Vol.61 (7), p.1613-1621
Main Authors: Barrett, Luke G, Thrall, Peter H, Burdon, Jeremy J
Format: Article
Language:English
Subjects:
Basidiomycota - genetics
Basidiomycota - physiology
Biodiversity
Biological Evolution
Biological variation
Coevolution
Correlation analysis
ecological specialization
Epidemics
Evolution
Evolutionary genetics
Flax - genetics
Flax - microbiology
Flowers & plants
Genetic loci
Genetic variation
geographic mosaic
Host pathogen relationships
Hybridization
Hybridization, Genetic
Linum
Original s
Pathogens
Plants
Population genetics
red queen hypothesis
resistance
sex
Virulence
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Summary:Coevolutionary outcomes between interacting species are predicted to vary across landscapes, as environmental conditions, gene flow, and the strength of selection vary among populations. Using a combination of molecular, experimental, and field approaches, we describe how broad-scale patterns of environmental heterogeneity, genetic divergence, and regional adaptation have the potential to influence coevolutionary processes in the Linum marginale–Melampsora lini plant–pathogen interaction. We show that two genetically and geographically divergent pathogen lineages dominate interactions with the host across Australia, and demonstrate a hybrid origin for one of the lineages. We further demonstrate that the geographic divergence of the two lineages of M. lini in Australia is related to variation among lineages in virulence, life-history characteristics, and response to environmental conditions. When correlated with data describing regional patterns of variation in host resistance diversity and mating system these observations highlight the potential for gene flow and geographic selection mosaics to generate and maintain coevolutionary diversification in long-standing host–pathogen interactions.
ISSN:0014-3820
1558-5646
DOI:10.1111/j.1558-5646.2007.00141.x