2021
DOI: 10.1094/phyto-06-20-0219-fi
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Population Genomics Trace Clonal Diversification and Intercontinental Migration of an Emerging Fungal Pathogen of Boxwood

Abstract: Boxwood blight was first documented in Europe, prior to its recent colonization of North America, where it continues to have significant negative impacts on the ornamental industry. Due to near genetic uniformity in the two sister species of fungal plant pathogens that cause boxwood blight, understanding historical disease emergence and predicting future outbreaks is limited. The goal of this research was to apply population genomics to understand the role of pathogen diversification and migration in disease e… Show more

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Cited by 19 publications
(26 citation statements)
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“…In developing species distribution models for Cps and evaluating the role of climatic factors in shaping its known range limits, we have provided some of the first insights into the potential invasive distribution and geographic origin of the most widespread and damaging pathogens of boxwood. Understanding where the pathogen could establish is particularly important in light of evidence for intercontinental dispersal and multiple introductions of Cps in the United States, which suggests that introductions of the pathogen are common and will likely continue to occur (Castroagudín et al 2020a, LeBlanc et al 2021. The CLIMEX and ensemble correlative model are consistent in predicting the potential for further spread in Europe (southern and eastern Europe), and in North America (southern, midwestern, and Pacific coast region).…”
Section: Discussionmentioning
confidence: 88%
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“…In developing species distribution models for Cps and evaluating the role of climatic factors in shaping its known range limits, we have provided some of the first insights into the potential invasive distribution and geographic origin of the most widespread and damaging pathogens of boxwood. Understanding where the pathogen could establish is particularly important in light of evidence for intercontinental dispersal and multiple introductions of Cps in the United States, which suggests that introductions of the pathogen are common and will likely continue to occur (Castroagudín et al 2020a, LeBlanc et al 2021. The CLIMEX and ensemble correlative model are consistent in predicting the potential for further spread in Europe (southern and eastern Europe), and in North America (southern, midwestern, and Pacific coast region).…”
Section: Discussionmentioning
confidence: 88%
“…Future modeling work that uses current climate data to evaluate risk of establishment may provide better insights into potential range limits for Cps, such as in high-elevation or highlatitude areas where the pathogen may now be capable of survival due to warming temperatures in recent decades. The CLIMEX model developed for this study could be modified to predict the potential distribution of C. henricotiae, a closely related but genetically distinct species that also causes boxwood blight (Gehesquière et al 2016, LeBlanc et al 2021. To date C. henricotiae has only been found in five countries in Europe, but further range expansion of this pathogen is expected and would likely influence boxwood blight epidemiology in the landscape because its thermotolerance is greater than Cps (Miller et al 2018, LeBlanc et al 2021.…”
Section: Discussionmentioning
confidence: 99%
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“…Cps infects Buxus plants globally, while Che is restricted to Europe [1][2][3][4]. Both species were previously classified as distinct genotypes of Cps, but multi-locus phylogenetic analysis, comparative genomics, and phenotypic differences supported their placement into separate sister species, with the erection of Che [3,5].…”
Section: Introductionmentioning
confidence: 99%