NDLI: Low crop plant population densities promote pollen-mediated gene flow in spring wheat (Triticum aestivum L.)

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Low crop plant population densities promote pollen-mediated gene flow in spring wheat (Triticum aestivum L.)

Content Provider	Springer Nature Link
Author	Willenborg, Christian J. Brûlé Babel, Anita L. Acker, Rene C.
Copyright Year	2009
Abstract	Transgenic wheat is currently being field tested with the intent of eventual commercialization. The development of wheat genotypes with novel traits has raised concerns regarding the presence of volunteer wheat populations and the role they may play in facilitating transgene movement. Here, we report the results of a field experiment that investigated the potential of spring wheat plant population density and crop height to minimize gene flow from a herbicide-resistant (HR) volunteer population to a non-HR crop. Pollen-mediated gene flow (PMGF) between the HR volunteer wheat population and four conventional spring wheat genotypes varying in height was assessed over a range of plant population densities. Natural hybridization events between the two cultivars were detected by phenotypically scoring plants in F$_{1}$ populations followed by verification with Mendelian segregation ratios in the F$_{1:2}$ families. PMGF was strongly associated with crop yield components, but showed no association with flowering synchrony. Maximum observed PMGF was always less than 0.6%, regardless of crop height and density. The frequency of PMGF in spring wheat decreased exponentially with increasing plant population density, but showed no dependence on either crop genotype or height. However, increasing plant densities beyond the recommended planting rate of 300 cropped wheat plants m$^{−2}$ provided no obvious benefit to reducing PMGF. Nevertheless, our results demonstrate a critical plant density of 175–200 cropped wheat plants m$^{−2}$ below which PMGF frequencies rise exponentially with decreasing plant density. These results will be useful in the development of mechanistic models and best management practices that collectively facilitate the coexistence of transgenic and nontransgenic wheat crops.
Starting Page	841
Ending Page	854
Page Count	14
File Format	PDF
ISSN	09628819
Journal	Transgenic Research
Volume Number	18
Issue Number	6
e-ISSN	15739368
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-04-22
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biosafety Herbicide-resistant Plant population density Pollen-mediated gene flow Spring wheat Volunteer crop Human Genetics Plant Sciences Animal Genetics and Genomics Plant Genetics & Genomics Molecular Medicine
Content Type	Text
Resource Type	Article
Subject	Genetics Animal Science and Zoology Biotechnology Agronomy and Crop Science

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