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  • Bioclimatic, ecological, and phenotypic intermediacy and high genetic admixture in a natural hybrid of octoploid strawberries

    Author(s)
    Salamone, I
    Govindarajulu, R
    Falk, S
    Parks, M
    Liston, A
    Ashman, TL
    Griffith University Author(s)
    Parks, Matthew
    Year published
    2013
    Metadata
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    Abstract
    堐remise of the Study: Hybrid zones provide "natural laboratories" for understanding the processes of selection, reinforcement, and speciation. We sought to gain insight into the degree of introgression and the extent of ecological-phenotypic intermediacy in the natural hybrid strawberry, Fragaria נananassa subsp. cuneifolia. 堍ethods: We used whole-plastome sequencing to identify parental species-specific (Fragaria chiloensis and F. virginiana) chloroplast single-nucleotide polymorphisms and combined the use of these with nuclear microsatellite markers to genetically characterize the hybrid zone. We assessed the potential ...
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    堐remise of the Study: Hybrid zones provide "natural laboratories" for understanding the processes of selection, reinforcement, and speciation. We sought to gain insight into the degree of introgression and the extent of ecological-phenotypic intermediacy in the natural hybrid strawberry, Fragaria נananassa subsp. cuneifolia. 堍ethods: We used whole-plastome sequencing to identify parental species-specific (Fragaria chiloensis and F. virginiana) chloroplast single-nucleotide polymorphisms and combined the use of these with nuclear microsatellite markers to genetically characterize the hybrid zone. We assessed the potential role of selection in the observed geographic patterns by bioclimatically characterizing the niche of the hybrid populations and phenotypically characterizing hybrid individuals of known genomic constitution. 堋ey Results: Significant admixture and little overall maternal bias in chloroplast or nuclear genomes suggest a high degree of interfertility among the parental and hybrid species and point to a long history of backcrossing and genetic mixing in the hybrid zone. Even though hybrids were phenotypically intermediate to the parental species, there was a discernible fingerprint of the parental genotype within hybrid individuals. Thus, although the pattern of introgression observed suggests geographic limitations to gene flow, it may be reinforced by selection for specific parental traits in the bioclimatically intermediate habitat occupied by the hybrid. 堃onclusions: This work uncovered the genetic complexity underlying the hybrid zone of the wild relatives of the cultivated strawberry. It lays the foundation for experimental dissection of the causes of genomic introgression and nuclear-cytoplasmic disassociation, and for understanding other parts of Fragaria evolutionary history.
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    Journal Title
    American Journal of Botany
    Volume
    100
    Issue
    5
    DOI
    https://doi.org/10.3732/ajb.1200624
    Subject
    Ecology
    Evolutionary biology
    Plant and fungus systematics and taxonomy
    Speciation and extinction
    Plant biology
    Publication URI
    http://hdl.handle.net/10072/54149
    Collection
    • Journal articles

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