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Virus Evolution Faced to Multiple Host Targets: The Potyvirus-Pepper Case Study.

The wealth of variability amongst genes controlling immunity against potyviruses in pepper (Capsicum spp.) has been instrumental in understanding plant-virus co-evolution and major determinants of plant resistance durability. Characterization of the eukaryotic initiation factor 4E1 (eIF4E1), involved in mRNA translation, as the basis of potyvirus resistance in pepper initiated a large body of work that showed that recessive resistance to potyviruses and other single-stranded positive-sense RNA viruses resulted from mutations in eukaryotic initiation factors in many plant crop species. Combining mutations in different eIF4Es in the same pepper genotype had complex effects on the breadth of the resistance spectrum and on resistance durability, revealing a trade-off between these two traits. In addition, combining eIF4E1 mutations with a quantitatively resistant genetic background had a strong positive effect on resistance durability. Analysing the evolutionary forces imposed by pepper genotypes onto virus populations allowed identifying three key factors improving plant resistance durability: the complexity of mutational pathways involved in virus adaptation to the plant resistance, the decrease of competitivity induced by these mutations on the virus and the intensity of genetic drift imposed by plant genotypes on the virus during its infection cycle.

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