Stress and domestication traits increase the relative fitness of crop–wild hybrids in sunflower

Authors

  • Kristin L. Mercer,

    Corresponding author
    1. Applied Plant Sciences Program, University of Minnesota, 411 Borlaug Hall, 1991 Upper Buford Circle, St Paul, MN 55108, USA
    2. Minnesota Center for Community Genetics, University of Minnesota, 100 Ecology, 1987 Upper Buford Circle, St Paul, MN 55108, USA
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    • Present address: Department of Evolution, Ecology and Organismal Biology, The Ohio State University, Columbus, OH 43210, USA.

  • David A. Andow,

    1. Minnesota Center for Community Genetics, University of Minnesota, 100 Ecology, 1987 Upper Buford Circle, St Paul, MN 55108, USA
    2. Department of Entomology, University of Minnesota, 219 Hodson Hall, 1980 Folwell Ave., St Paul, MN 55108, USA
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  • Donald L. Wyse,

    1. Department of Agronomy and Plant Genetics, University of Minnesota, 411 Borlaug Hall, 1991 Upper Buford Circle, St Paul, MN 55108, USA
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  • Ruth G. Shaw

    1. Minnesota Center for Community Genetics, University of Minnesota, 100 Ecology, 1987 Upper Buford Circle, St Paul, MN 55108, USA
    2. Department of Ecology, Evolution and Behavior, 100 Ecology, 1987 Upper Buford Circle, University of Minnesota, St. Paul, MN 55108, USA
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*E-mail: mercer.97@osu.edu

Abstract

After a decade of transgenic crop production, the dynamics of gene introgression into wild relatives remain unclear. Taking an ecological genetics approach to investigating fitness in crop–wild hybrid zones, we uncovered both conditions and characteristics that may promote introgression. We compared diverse crop–wild hybrid genotypes relative to wild Helianthus annuus under one benign and three stressful agricultural environments. Whereas relative fitness of crop–wild hybrids averaged 0.25 under benign conditions, with herbicide application or competition it reached 0.45 and was more variable. In some instances, hybrid fitness matched wild fitness (≈ 1). Thus, wild populations under agronomic stress may be more susceptible to introgression. Although ‘domestication’ traits are typically considered unlikely to persist in wild populations, we found some (e.g. rapid growth and early flowering) that may enhance hybrid fitness, especially in stressful environments. Rigorous assessment of how particular genotypes, phenotypes, and environments affect introgression will improve risk assessment for transgenic crops.

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