Fig. 3

Visualisations of population analyses conducted using 54 864 informative single nucleotide polymorphisms (SNPs) in 435 Leptosphaeria maculans isolates collected across 12 countries. Arg = Argentina; Aus = Australia; Can = Canada; Cz = Czechia; Fr = France; Ger = Germany; IV = In vitro; Ir = Iran; Nz = New Zealand; SA = South Africa; UK = United Kingdom; USA = United States of America (a) Scatterplot generated from the discriminant analysis of principal components (DAPC) using the first 100 principal components (PC’s) and four discriminant functions (LD). Each point represents an individual isolate, and colours denote their country-of-origin (b) Admixture plot for K = 5 showing admixture coefficients for different subpopulations (P1-P5) as determined by sparse nonnegative matrix factorisation (SNMF) on clone corrected data (R package LEA). Each column represents an individual isolate with the length of each colour segment denoting the proportions of a subpopulation assigned to the isolate with no prior on location. (c) Map showing the geographical distributions of the five subpopulations (P1-P5) based on mean admixture proportions. Colour codes for P1-P5 is shared by b and c