2022
DOI: 10.1002/ece3.8832
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Phyllachora species infecting maize and other grass species in the Americas represents a complex of closely related species

Abstract: The genus Phyllachora contains numerous obligate fungal parasites that produce raised, melanized structures called stromata on their plant hosts referred to as tar spot. Members of this genus are known to infect many grass species but generally do not cause significant damage or defoliation, with the exception of P . maydis which has emerged as an important pathogen of maize throughout the Americas, but the origin of this pathogen remains unk… Show more

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Cited by 6 publications
(7 citation statements)
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“…STRUCTURE and population genetic analyses based on Nei’s (1972) genetic distance supported the subdivision of the P. maydis population into two clusters, suggesting the possibility of differentiation within the species. These results support the findings of Broders et al (2022) that revealed variation and possibly multiple species related to P. maydis in northern North America. Identification of population subdivision within a particular geographic area could be associated with variations in the agro-ecosystems, such as sources of inoculum and host or tissue specificity (Milgroom and Peever 2003).…”
Section: Discussionsupporting
confidence: 91%
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“…STRUCTURE and population genetic analyses based on Nei’s (1972) genetic distance supported the subdivision of the P. maydis population into two clusters, suggesting the possibility of differentiation within the species. These results support the findings of Broders et al (2022) that revealed variation and possibly multiple species related to P. maydis in northern North America. Identification of population subdivision within a particular geographic area could be associated with variations in the agro-ecosystems, such as sources of inoculum and host or tissue specificity (Milgroom and Peever 2003).…”
Section: Discussionsupporting
confidence: 91%
“…The exact mode of dissemination of P. maydis throughout the Midwest U.S. Corn Belt is not fully understood. However, the two most likely hypotheses include long-distance aerial dissemination of spores, or movement of infested corn material from one location to the next, presumably through human activities but also possibly via climatic systems such as high wind events including derechos and tornadoes (Broders et al 2022; Valle-Torres et al 2020). Dissemination of infested corn material may have resulted in migration and gene flow between populations resulting in the genetic signal of admixture among samples from the different geographical origins.…”
Section: Discussionmentioning
confidence: 99%
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“…Recent work, however, assessing the diversity of isolates of Phyllachora spp. and P. maydis from field and herbarium samples indicates that there may be more complexity in host associations than previously thought (Broders et al 2022).…”
Section: Host Rangementioning
confidence: 82%