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Congruent population genetic structures and divergence histories in anther-smut fungi and their host plants Silene italica and the Silene nutans species complex
- Source :
- Molecular Ecology, Molecular Ecology, Wiley, 2020, 29 (6), pp.1154-1172. ⟨10.1111/mec.15387⟩
- Publication Year :
- 2019
-
Abstract
- Study of the congruence of population genetic structure between hosts and pathogens gives important insights into their shared phylogeographical and coevolutionary histories. We studied the population genetic structure of castrating anther-smut fungi (genus Microbotryum) and of their host plants, the Silene nutans species complex, and the morphologically and genetically closely related Silene italica, which can be found in sympatry. Phylogeographical population genetic structure related to persistence in separate glacial refugia has been recently revealed in the S. nutans plant species complex across Western Europe, identifying several distinct lineages. We genotyped 171 associated plant-pathogen pairs of anther-smut fungi and their host plant individuals using microsatellite markers and plant chloroplastic single nucleotide polymorphisms. We found clear differentiation between fungal populations parasitizing S. nutans and S. italica plants. The population genetic structure of fungal strains parasitizing the S. nutans plant species complex mirrored the host plant genetic structure, suggesting that the pathogen was isolated in glacial refugia together with its host and/or that it has specialized on the plant genetic lineages. Using random forest approximate Bayesian computation (ABC-RF), we found that the divergence history of the fungal lineages on S. nutans was congruent with that previously inferred for the host plant and probably occurred with ancient but no recent gene flow. Genome sequences confirmed the genetic structure and the absence of recent gene flow between fungal genetic lineages. Our analyses of individual host-pathogen pairs contribute to a better understanding of co-evolutionary histories between hosts and pathogens in natural ecosystems, in which such studies remain scarce.
- Subjects :
- 0106 biological sciences
0301 basic medicine
cryptic speciation
[SDV]Life Sciences [q-bio]
co-evolution
host-pathogen interaction
01 natural sciences
Gene flow
Biological Coevolution
population genetic structure
Silene
education.field_of_study
biology
Silene nutans
DNA, Chloroplast
food and beverages
Europe
Phylogeography
[SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology
approximate Bayesian computation
genetic divergence
Genetic structure
Genome, Fungal
Genome, Plant
Gene Flow
Genetic Markers
Species complex
Genotype
Population
Flowers
010603 evolutionary biology
Polymorphism, Single Nucleotide
03 medical and health sciences
Genetics
education
Ecology, Evolution, Behavior and Systematics
Plant Diseases
Cell Nucleus
Host (biology)
Basidiomycota
fungi
15. Life on land
biology.organism_classification
Genetic divergence
030104 developmental biology
Genetics, Population
Evolutionary biology
Microbotryum
Microsatellite Repeats
Subjects
Details
- ISSN :
- 1365294X and 09621083
- Volume :
- 29
- Issue :
- 6
- Database :
- OpenAIRE
- Journal :
- Molecular ecologyREFERENCES
- Accession number :
- edsair.doi.dedup.....963da1071f3f2d792fac656fc63da3da