Clonality and geographic structure of host-specialized populations of Corynespora cassiicola causing emerging target spot epidemics in the southeastern United States

Autor: Yeshwant R. Mehta, Marin Talbot Brewer, Leilani G. Sumabat, Dong Kyun Kim, Robert C. Kemerait
Jazyk: angličtina
Rok vydání: 2018
Předmět:
0106 biological sciences
0301 basic medicine
Epidemiology
Population genetics
lcsh:Medicine
Artificial Gene Amplification and Extension
Cotton
01 natural sciences
Polymerase Chain Reaction
Microsatellite Loci
Solanum lycopersicum
Medicine and Health Sciences
lcsh:Science
Flowering Plants
Phylogeny
education.field_of_study
Multidisciplinary
biology
Geography
Ecology
Eukaryota
food and beverages
Agriculture
Plants
Southeastern United States
Phylogeography
Biogeography
Genetic Epidemiology
Research Article
Ecological Metrics
Genotype
Population
Zoology
Crops
Research and Analysis Methods
Host Specificity
03 medical and health sciences
Ascomycota
Gene Types
Genetic variation
Genetics
education
Corynespora cassiicola
Molecular Biology Techniques
Molecular Biology
Plant Diseases
Genetic diversity
Evolutionary Biology
Gossypium
Population Biology
Host (biology)
Ecology and Environmental Sciences
lcsh:R
Organisms
Biology and Life Sciences
Genetic Variation
Species Diversity
Sequence Analysis
DNA
biology.organism_classification
030104 developmental biology
Genetics
Population
Earth Sciences
Biological dispersal
lcsh:Q
Soybeans
Soybean
Population Genetics
010606 plant biology & botany
Crop Science
Microsatellite Repeats
Zdroj: PLoS ONE, Vol 13, Iss 10, p e0205849 (2018)
PLoS ONE
ISSN: 1932-6203
Popis: Corynespora cassiicola is a destructive plant-pathogenic fungus causing widespread target spot epidemics, including outbreaks on cotton, soybean, and tomato in the southeastern United States. Previous studies revealed that populations from the three hosts are genetically distinct and host specialized. Although variation in aggressiveness to cotton and tomato were observed, no genetic diversity was detected within populations sampled from each of these hosts. We aimed to gain a better understanding of the emerging target spot epidemics by developing microsatellite markers for C. cassiicola to assess genetic variation, population structure, and to infer modes of reproduction and mechanisms of dispersal. Two hundred sixty-five isolates from cotton, soybean, tomato, and other host plants were genotyped with 13 microsatellite markers. Genotypic diversity revealed genetic variation within each of the populations collected from different hosts, with the population from cotton dominated by clonal genotypes and showing the least genetic diversity. In addition, C. cassiicola populations on different host species were genetically distinct and structured based on host species. No association between genetic and geographic distances was identified in the tomato populations, and the association in cotton populations was low. However, significant regional geographic structure was detected in the soybean populations of C. cassiicola. These results further support previous findings of introduced host specialized isolates or the evolution of more aggressive strains on each host. The lack of geographic structure suggests that the clones on cotton and tomato spread rapidly, or similar founder populations were established by human-mediated dispersal, and that dispersal is not limited. However, regional geographic structure of populations on soybean suggests limited dispersal among more established populations of C. cassiicola, or genetic differences in founder populations that colonized different geographic areas.
Databáze: OpenAIRE
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