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Metabolic efficiency reshapes the seminal relationship between pathogen growth rate and virulence
Richard J Lindsay1, Philippa J Holder1, Nicholas J Talbot2
1Biosciences and Living Systems Institute, University of Exeter, Exeter, UK.
Ecology Letters
|April 14, 2023
Summary
Pathogen growth rate and virulence are not always directly linked. This study reveals a complex, non-monotonic relationship influenced by metabolic efficiency, offering new insights for disease management.
Area of Science:
- Evolutionary biology
- Pathogen-host interactions
- Plant pathology
Background:
- Classical virulence evolution theories assume a positive correlation between pathogen growth rate and virulence.
- These theories are foundational for disease management strategies but face empirical challenges.
- Existing models lack a key component to explain observed growth-virulence data.
Discussion:
- Empirical data often contradicts the simple positive growth-virulence assumption.
- This study investigates the interplay between growth rate and metabolic efficiency in pathogen virulence.
- Engineered strains of Magnaporthe oryzae were used to explore these relationships in planta.
Key Insights:
- A non-monotonic relationship between pathogen growth rate and virulence was uncovered.
- This relationship is jointly shaped by the interaction of growth rate and metabolic efficiency.
- A single metabolic gene modification significantly altered nutrient acquisition and growth rates.
Outlook:
- The findings necessitate a revision of classical virulence evolution theories.
- A new mechanistic framework is proposed, consistent with empirical observations.
- This research paves the way for more predictive and effective sustainable disease management.
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