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Evolutionary dynamics of plant R-genes
J Bergelson1, M Kreitman, E A Stahl
1Department of Ecology and Evolution, University of Chicago, 1101 East 57th Street, Chicago, IL 60637, USA. jbergels@midway.uchicago.edu
Plant R-genes, crucial for pathogen recognition, show rapid evolution due to coevolutionary arms races. However, within-species genetic diversity suggests complex evolutionary dynamics beyond simple selective sweeps.
Area of Science:
- Plant pathology
- Evolutionary genetics
- Molecular biology
Background:
- Plant R-genes mediate gene-for-gene interactions with pathogens.
- These interactions are expected to drive coevolutionary arms races.
- Rapid evolution of R-genes is hypothesized to be a hallmark of these arms races.
Purpose of the Study:
- To investigate the evolutionary dynamics of plant R-genes.
- To examine evidence for coevolutionary arms races in R-gene evolution.
- To understand the role of within-species polymorphism in R-gene adaptation.
Main Methods:
- Analysis of available R-gene sequence data.
- Examination of evolutionary rates in specific R-gene regions (leucine-rich repeats).
- Assessment of within-species polymorphism patterns.
Main Results:
- Solvent-exposed amino acid residues in leucine-rich repeats of R-genes evolve at unusually fast rates.
- Significant within-species polymorphism is observed in R-genes.
- These findings support the hypothesis of coevolutionary arms races.
Conclusions:
- Plant R-genes exhibit rapid evolution consistent with coevolutionary pressures.
- Within-species polymorphism indicates that R-gene evolution is not solely driven by successive selective sweeps.
- The observed patterns reflect complex adaptive evolutionary dynamics between plants and pathogens.
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