Figure 1

Partition of genetic variation. Admixture clustering plots of the 11 Myzus persicae samples examined. Number of clusters, K = 3; Custer 1 = green colour, Cluster 2 = red colour, Cluster 3 = blue. Each aphid lineage is represented as a vertical bar partitioned into K segments. The lengths of each segment are proportional to the estimated membership coefficients of the lineage in each of the three K clusters. Lineages of different samples are separated by black lines. AMV = America (first from peach in Argentina, second from weeds in Chile, the last two from pepper in Canada) (n = 4), FRP = France peach (four lineages from weeds) (n = 62), WET = Western Europe tobacco and pepper (the third lineage) (n = 6), NGP = northern Greece peach (n = 20), CGP = central eastern Greece peach (n = 19), GRT = Greece (northern and southern regions) tobacco (n = 14), AUO = New Zealand (plus two lineages from potato and peach in Australia) potato (n = 23), SCO = Scotland other than tobacco crops (n = 16), ENO = England other than tobacco crops (n = 9), SLO = Slovenia (the last lineage from Turkey) pepper and potato (n = 17), FES = Far East (first two from weeds from Sri Lanka, third from peach from Japan, fourth and fifth from radish and potato from Japan and the last two from tobacco from Japan) (n = 7). The samples from peach in northern Greece and Japan were from tobacco growing regions as was the sample from weeds in Chile. All the other non-tobacco samples were collected in non-tobacco growing regions.