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    Fecundity selection in a sunflower crop-wild study: can ecological data predict crop allele changes?

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    AlexH_2002.pdf (127.1Kb)
    Issue Date
    2002-12-01
    Author
    Cummings, Charity L.
    Alexander, Helen M.
    Snow, Allison A.
    Rieseberg, Loren H.
    Kim, Min Ju
    Culley, Theresa M.
    Publisher
    Ecological Society of America
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Metadata
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    Abstract
    Genes that spread from transgenic crops to populations of weedy relatives can be a cause of concern if fitness-related, transgenic traits persist and enhance weed invasiveness. Studies of the prevalence of crop-specific genetic markers in wild populations can provide data on such introgression. We conducted a field experiment in eastern Kansas to measure changes in frequencies of crop-specific genetic markers in wild sunflower (Helianthus annuus). Three allozyme markers were monitored in three artificial populations that each initially consisted of 100 wild and 100 F1 hybrid plants. Survival, flowering time, and average seed production per plant were quantified during the first year of the study (1997). Hybrid plants produced only 1–2% as many seeds per plant as wild plants but did not differ in survivorship. Simple selection models incorporating fecundity differences between wild and F1 hybrids accurately predicted crop allele frequencies in the 1998 seedlings. We predicted that frequencies of crop alleles in 1998 would average ∼0.03 for the three populations. Crop-specific allele frequencies dropped from the initial level of 0.25 to a mean of 0.03 in the 1998 seedlings and averaged 0.05 in the next generation of seeds. Accounting for differences in flowering phenology and predispersal seed predation did not improve the accuracy of our predictions for 1998 seedlings. Our results suggest that ecological data can be useful for estimating the frequencies of crop genes following episodes of crop–wild hybridization in sunflowers. This approach can be applied to other study systems in which data on survivorship and fecundity are used to estimate a genotype's evolutionary fitness.
    Description
    This is the publisher's version, also available electronically from http://www.esajournals.org/doi/abs/10.1890/1051-0761%282002%29012%5B1661%3AFSIASC%5D2.0.CO%3B2.
    URI
    http://hdl.handle.net/1808/15186
    DOI
    https://doi.org/10.1890/1051-0761(2002)012[1661:FSIASC]2.0.CO;2
    ISSN
    1051-0761
    Collections
    • Ecology and Evolutionary Biology Scholarly Works [1176]
    Citation
    Cummings, Charity L. et al. (2002). "Fecundity selection in a sunflower crop-wild study: can ecological data predict crop allele changes?" Ecological Applications, 12(6):1661. http://dx.doi.org/10.1890/1051-0761(2002)012[1661:FSIASC]2.0.CO;2

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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