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Fig. 1 | BMC Ecology and Evolution

Fig. 1

From: Evolution of pathogen response genes associated with increased disease susceptibility during adaptation to an extreme drought in a Brassica rapa plant population

Fig. 1

Differentiation at multiple loci across the genome in a Brassica rapa population after seven years of drought, as well as historical measures of selection. a FST, an estimate of allelic differentiation between the 1997 and 2004 populations, was calculated using 100 kb sliding windows and then averaged for each gene (dots shown). Genes reported in the literature as involved in response to necrotrophic fungal infection (A. brassicicola) are shown in black. All other genes are shown in grey. For necrotrophic fungal pathogen response genes, significantly differentiated genes are labelled with red points and their gene ID. A LOESS trend line (span = 0.03) is shown for all genes (blue) and just for necrotrophic fungal pathogen response genes (red). Tajima’s D, a statistic estimating the effect of non-random processes from the site frequency spectrum, shows historical selection across the genome for the b ancestral population and c descendant populations. Analysis was conducted using a 100 kb sliding window (dots shown are windows; LOESS trend line in blue). Red bars highlight regions containing necrotrophic pathogen related genes with a significant high FST that are also in an area with reduced Tajima’s D (visual inspection). Regions with reduced Tajima’s D may have been subject to a historical selective sweep

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