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Heuristic Mining of Hierarchical Genotypes and Accessory Genome Loci in Bacterial Populations

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Comparative Genomics Provide Insight Into the Evolution of European Aphanomyces euteiches Strains.

Carol Kälin¹, Edoardo Piombo¹, David Manyara Wairimu¹

¹Department of Forest Mycology and Plant Pathology, Swedish University of Agricultural Sciences, Uppsala, Sweden.

Genome Biology and Evolution

|March 15, 2026

Summary

This summary is machine-generated.

Genomic analysis of Aphanomyces euteiches revealed three European genetic groups, with Italian strains forming a distinct, potentially cryptic species. This research aids in understanding oomycete pathogen evolution and pea disease management.

Keywords:

Aphanomyces euteiches carbohydrate esterase comparative genomics pea phylogenetic analysis root rot

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Area of Science:

Plant Pathology
Genomics
Oomycete Biology

Background:

Aphanomyces euteiches causes significant root rot and yield loss in legumes.
Previous studies identified three European genetic groups using SSR markers.

Purpose of the Study:

Investigate the population genetic structure of A. euteiches using whole-genome data.
Delineate species boundaries and identify adaptive gene evolution.
Explore the genetic basis of virulence in A. euteiches.

Main Methods:

Genome sequencing of 68 European A. euteiches strains.
Comparative genomic analysis and population genetics using SNPs.
Gene family evolution analysis and modular structure analysis.

Main Results:

Three distinct genetic groups identified, with Italian strains forming a genetically isolated cluster, suggesting a cryptic species.
Virulence varied among strains but did not correlate with genetic groups.
Significant expansion of gene families involved in detoxification and carbohydrate esterase family 1 (CE1) observed in A. euteiches.

Conclusions:

Italian A. euteiches strains may represent a cryptic species, necessitating further taxonomic investigation.
Expanded gene families, particularly CE1 with feruloyl esterase domains, likely contribute to the plant pathogenic lifestyle and plant cell wall degradation.
Understanding genetic diversity and adaptive evolution is crucial for managing Aphanomyces root rot in pea and legumes.