Host-specific differentiation among populations of Venturia inaequalis causing scab on apple, pyracantha and loquat

Patterns of multilocus DNA sequence variation within and between closely related taxa can provide insights into the history of divergence. Here, we report on DNA polymorphism and divergence at six nuclear loci in globally distributed samples of the ascomycete Venturia inaequalis, responsible for sca...

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Bibliographic Details
Published in:Fungal genetics and biology 2010-06, Vol.47 (6), p.511-521
Main Authors: Gladieux, P., Caffier, V., Devaux, M., Le Cam, B.
Format: Article
Language:English
Subjects:
Allopatry
Ascomycetes
Ascomycota - classification
Ascomycota - genetics
Ascomycota - isolation & purification
Divergence population genetics
Eriobotrya
Eriobotrya - microbiology
Evolution, Molecular
Gene Flow
Genes, Fungal
Genetics
Haplotypes
Host-Pathogen Interactions
Life Sciences
Malus
Malus - microbiology
Phylogenetic species recognition
Phylogeny
Plant Diseases - microbiology
Polymorphism, Single Nucleotide
Pyracantha - microbiology
Recombination, Genetic
Reproductive isolation
Specialization
Speciation
Spilocaea
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Summary:Patterns of multilocus DNA sequence variation within and between closely related taxa can provide insights into the history of divergence. Here, we report on DNA polymorphism and divergence at six nuclear loci in globally distributed samples of the ascomycete Venturia inaequalis, responsible for scab on apple, loquat, and pyracantha. Isolates from different hosts were differentiated but did not form diagnosable distinct phylogenetic species. Parameters of an Isolation-with-Migration model estimated from the data suggested that the large amount of variation shared among groups more likely resulted from recent splitting than from extensive genetic exchanges. Inferred levels of gene flow among groups were low and more concentrated toward recent times, and we identified two potentially recent one-off shifters from apple and pyracantha to loquat. These findings support a scenario of recent divergence in allopatry followed by introgression through secondary contact, with groups from loquat and pyracantha being the most recently differentiated.
ISSN:1087-1845
1096-0937
DOI:10.1016/j.fgb.2009.12.007