Apr 16, 2020

Asian wild apples threatened by gene flow from domesticated apples and by their pestified pathogen

BioRxiv : the Preprint Server for Biology
A. FeurteyChristophe Lemaire


Massive gene flow between crops and their wild relatives may threaten the genetic integrity of wild species. Such threats are now well documented, but little is known about indirect consequences involving the spillover of crop pathogens to wild plants or introgression between crop and wild pathogens. To address these questions, we used population genetics approaches, demographic inference and pathogenicity tests on host-pathogen pairs. Our study system is composed of wild or domesticated apple trees of Central Asia and their fungal pathogen, Venturia inaequalis, itself differentiated into agricultural-type and wild-type populations. We confirmed the occurrence of gene flow from cultivated to wild apple trees in Asian forests, threatening the Asian wild apple genetic integrity. SNP markers and demographic modeling revealed the occurrence of a secondary contact followed by hybridization between agricultural-type and wild-type fungal pathogen populations, and the dispersal of the agricultural-type pathogen in wild forests. We detected a SNP predicting the ability of the fungus to parasitize the different host populations, which induced an early stop codon in a gene coding for a small secreted protein in the agricultural-type funga...Continue Reading

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Mentioned in this Paper

Research Organization
Biological Regulation
Environmental Infrastructure
Arthropod Vectors
Pathogenic Organism
Research Personnel
Genetic Manipulation

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