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Updated: Jan 22, 2026

Testing the Role of Multicopy Plasmids in the Evolution of Antibiotic Resistance

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Análisis del genoma completo de grafos revela la evolución de la ruptura de la resistencia en el mildiú velloso de la

Petros Skiadas^1,2, Melanie N Mendel^2,3, Joyce Elberse²

¹Theoretical Biology and Bioinformatics, Department of Biology, Utrecht University, Utrecht, The Netherlands.

|January 20, 2026

Resumen

Este estudio revela cómo el patógeno del mildiú velloso de la espinaca, Peronospora effusa, evoluciona para superar la resistencia de las plantas. El análisis genómico identificó genes efectores específicos que impulsan esta rápida adaptación, ofreciendo objetivos para el futuro mejoramiento de la espinaca.

Área de la Ciencia:

Plant pathology
Genomics
Evolutionary biology

Sus antecedentes:

Filamentous plant pathogens evolve rapidly, overcoming crop resistance through effector gene evolution.
Peronospora effusa causes downy mildew in spinach and its resistance-breaking mechanisms are poorly understood.
Crop monocultures accelerate pathogen evolution, leading to frequent resistance breakdown.

Objetivo del estudio:

To investigate the genomic adaptations enabling Peronospora effusa to overcome spinach resistance.
To identify specific effector genes and evolutionary pathways involved in resistance breaking.
To provide insights for developing durable spinach resistance strategies.

Principales métodos:

Generated genome assemblies for 19 Peronospora effusa isolates representing distinct resistance-breaking races.
Constructed a haplotype-resolved pangenome graph to analyze genomic variation and evolution.
Phased effector candidates to identify allelic variations associated with resistance breaking.

Principales resultados:

Identified diverse evolutionary trajectories in P. effusa isolates, including recent sexual recombination and prolonged asexual reproduction.
Discovered specific effector candidates linked to the ability of P. effusa to break spinach resistance.
Reconstructed the evolutionary history of effector diversification in response to host resistance.

Conclusiones:

Computational genomics approaches provide crucial insights into the rapid evolution of P. effusa.
Specific effectors are key drivers of resistance breakdown in spinach downy mildew.
Findings can inform future breeding programs for durable spinach resistance.

Palabras clave:

mildiú velloso Peronospora effusa genómica evolución resistencia de plantas efectores recombinación sexual reproducción asexual grafos de genoma completo

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