Figure S1. Geographic location of strains(circles) and hosts (squares) sampling sites. Populations ofstrains are identified by different colours: WildAsiaSiev (red),AgroAsiaSiev (orange), AgroAsiaDom (purple), AgroEuDom (yellow) andWildEuSylv (green). Red squares represent the three accessions ofM. sieversii from Kazakhstan. Accessions of M.sylvestris are located in France in the Rambouillet forest(next to Paris). Maps are provided by Google Earth©.

Data S1. M. sylvestris accessions were genotyped using microsatellite markers, and their assignment to the gene pool of their putative species of origin was checked using a reference data set.

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