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Communication Dans Un Congrès Année : 2023

Effects of pathogen sexual reproduction on the evolutionary and epidemiological control provided by deployment strategies for two major resistance genes in agricultural landscapes

Résumé

Resistant cultivars are of value for protecting crops from disease, but can be rapidly overcome by pathogens. Several strategies have been proposed to delay pathogen adaptation (evolutionary control), while maintaining effective protection (epidemiological control). Resistance genes can be i) combined in the same cultivar (pyramiding), ii) deployed in different cultivars sown in the same field (mixtures) or in different fields (mosaics), or iii)alternated over time (rotations). The outcomes of these strategies have been investigated principally in pathogens displaying pure clonal reproduction, but many pathogens have at least one sexual event in their annual life cycles. Sexual reproduction may promote the emergence of superpathogens adapted to all the resistance genes deployed. Here we improved the spatially explicit stochastic model landsepi to include pathogen sexual reproduction, and then investigated the effect of sexual reproduction on evolutionary and epidemiological outcomes across deployment strategies for two major resistance genes. Sexual reproduction favours the establishment of a superpathogen when single mutant pathogens are present together at a sufficiently high frequency, as in mosaic and mixture strategies. However, sexual reproduction did not affect the optimal strategy recommendations for a wide range of mutation probabilities, associated fitness costs, and landscape organisations.
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Dates et versions

hal-04195648 , version 1 (04-09-2023)

Identifiants

  • HAL Id : hal-04195648 , version 1

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Marta Zaffaroni, Loup Rimbaud, Jean-François Rey, Frédéric Fabre, Julien Papaïx. Effects of pathogen sexual reproduction on the evolutionary and epidemiological control provided by deployment strategies for two major resistance genes in agricultural landscapes. 12. International congress of plant pathology (ICPP), Aug 2023, Lyon, France. ⟨hal-04195648⟩
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