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- W4310183457 abstract "Impatiens downy mildew (IDM) caused by Plasmopara destructor is currently the primary constraint on the production and use of impatiens (Impatiens walleriana) as bedding plants worldwide. Downy mildew has been documented since the 1880s from wild-grown Impatiens spp. but epidemic outbreaks of the disease affecting the commercially grown, ornamental I. walleriana were only reported for the first time in 2003 in the United Kingdom and in 2004 in the United States. Here, we assess the genetic diversity, level of differentiation, and population structure from 623 samples associated with current and preepidemic IDM outbreaks, by genotyping the samples with simple sequence repeat markers. P. destructor population structure following the emergence of IDM in the United States is subdivided into four genetic lineages characterized by high genetic diversity, mixed reproduction mode, inbreeding, and an excess of heterozygosity. P. destructor genotypes are significantly differentiated from preepidemic IDM samples from hosts other than I. walleriana but no geographical or temporal subdivision is evident. P. destructor samples from different Impatiens spp. show significant but very low levels of differentiation in the analysis of molecular variance test that did not hold in discriminant analysis of principal components analyses. The same was observed between samples of P. destructor and P. velutina recovered from I. walleriana. The finding of shared genotypes in samples from different countries and lack of differentiation among U.S. and Costa Rican samples indicate the occurrence of international movement of the pathogen. Our study provides the first high-resolution analysis of the diversity of P. destructor populations and the IDM epidemic that may be instrumental for disease management and breeding efforts." @default.
- W4310183457 created "2022-11-30" @default.
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- W4310183457 date "2023-07-01" @default.
- W4310183457 modified "2023-09-26" @default.
- W4310183457 title "The Impatiens Downy Mildew Epidemic in the United States Is Caused by New, Introgressed Lineages of <i>Plasmopara destructor</i> with Prominent Genotypic Diversity and High Evolutionary Potential" @default.
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- W4310183457 doi "https://doi.org/10.1094/pdis-08-22-1872-re" @default.
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