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- W2981217392 endingPage "e1008223" @default.
- W2981217392 startingPage "e1008223" @default.
- W2981217392 abstract "Filamentous fungi rapidly evolve in response to environmental selection pressures in part due to their genomic plasticity. Parastagonospora nodorum, a fungal pathogen of wheat and causal agent of septoria nodorum blotch, responds to selection pressure exerted by its host, influencing the gain, loss, or functional diversification of virulence determinants, known as effector genes. Whole genome resequencing of 197 P. nodorum isolates collected from spring, durum, and winter wheat production regions of the United States enabled the examination of effector diversity and genomic regions under selection specific to geographically discrete populations. 1,026,859 SNPs/InDels were used to identify novel loci, as well as SnToxA and SnTox3 as factors in disease. Genes displaying presence/absence variation, predicted effector genes, and genes localized on an accessory chromosome had significantly higher pN/pS ratios, indicating a higher rate of sequence evolution. Population structure analyses indicated two P. nodorum populations corresponding to the Upper Midwest (Population 1) and Southern/Eastern United States (Population 2). Prevalence of SnToxA varied greatly between the two populations which correlated with presence of the host sensitivity gene Tsn1 in the most prevalent cultivars in the corresponding regions. Additionally, 12 and 5 candidate effector genes were observed to be under diversifying selection among isolates from Population 1 and 2, respectively, but under purifying selection or neutrally evolving in the opposite population. Selective sweep analysis revealed 10 and 19 regions that had recently undergone positive selection in Population 1 and 2, respectively, involving 92 genes in total. When comparing genes with and without presence/absence variation, those genes exhibiting this variation were significantly closer to transposable elements. Taken together, these results indicate that P. nodorum is rapidly adapting to distinct selection pressures unique to spring and winter wheat production regions by rapid adaptive evolution and various routes of genomic diversification, potentially facilitated through transposable element activity." @default.
- W2981217392 created "2019-10-25" @default.
- W2981217392 creator A5002362140 @default.
- W2981217392 creator A5003997063 @default.
- W2981217392 creator A5005847037 @default.
- W2981217392 creator A5016555620 @default.
- W2981217392 creator A5022235578 @default.
- W2981217392 creator A5059458995 @default.
- W2981217392 creator A5079982069 @default.
- W2981217392 date "2019-10-18" @default.
- W2981217392 modified "2023-10-15" @default.
- W2981217392 title "Local adaptation drives the diversification of effectors in the fungal wheat pathogen Parastagonospora nodorum in the United States" @default.
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