Modeling the Influence of Gene Flow and Selection Pressure on the Frequency of a GE Herbicide‐Tolerant Trait in Non‐GE Wheat and Wheat Volunteers

Crop Science ◽  
2006 ◽  
Vol 46 (4) ◽  
pp. 1704-1710 ◽  
Author(s):  
Anita L. Bruˆl'‐Babel ◽  
Christian J. Willenborg ◽  
Lyle F. Friesen ◽  
Rene C. Acker
Keyword(s):  
Gene Flow ◽  
Selection Pressure ◽  
Herbicide Tolerant

Potential gene flow of two herbicide-tolerant transgenes from oilseed rape to wild B. juncea var. gracilis

2010 ◽  
Vol 120 (8) ◽  
pp. 1501-1510 ◽  
Author(s):  
Xiaoling Song ◽  
Zhou Wang ◽  
Jiao Zuo ◽  
Chaohe Huangfu ◽  
Sheng Qiang
Keyword(s):  
Gene Flow ◽  
Oilseed Rape ◽  
Herbicide Tolerant

scholarly journals Local selection in the presence of high levels of gene flow: Evidence of heterogeneous insecticide selection pressure across Ugandan Culex quinquefasciatus populations

2017 ◽  
Vol 11 (10) ◽  
pp. e0005917 ◽  
Author(s):  
Walter Fabricio Silva Martins ◽  
Craig Stephen Wilding ◽  
Keith Steen ◽  
Henry Mawejje ◽  
Tiago Rodrigues Antão ◽  
...  
Keyword(s):  
Gene Flow ◽  
Culex Quinquefasciatus ◽  
Selection Pressure ◽  
Local Selection

Inter-specific Gene Flow from Herbicide-Tolerant Crops to their Wild Relatives

2017 ◽  
pp. 87-122 ◽  
Author(s):  
Amit J. Jhala ◽  
Debalin Sarangi ◽  
Parminder Chahal ◽  
Ashish Saxena ◽  
Muthukumar Bagavathiannan ◽  
...  
Keyword(s):  
Gene Flow ◽  
Wild Relatives ◽  
Specific Gene ◽  
Herbicide Tolerant

Gene flow from herbicide-tolerant GM rice and the heterosis of GM rice-weed F2 progeny

Planta ◽  
2011 ◽  
Vol 233 (4) ◽  
pp. 807-815 ◽  
Author(s):  
Young Jin Chun ◽  
Dae In Kim ◽  
Kee Woong Park ◽  
Hyo-Jeong Kim ◽  
Soon-Chun Jeong ◽  
...  
Keyword(s):  
Gene Flow ◽  
Gm Rice ◽  
Herbicide Tolerant ◽  
F2 Progeny

scholarly journals A decade of herbicide-resistant crops in Canada

2006 ◽  
Vol 86 (4) ◽  
pp. 1243-1264 ◽  
Author(s):  
H. J. Beckie ◽  
K. N. Harker ◽  
L. M. Hall ◽  
S. I. Warwick ◽  
A. Légère ◽  
...  
Keyword(s):  
Gene Flow ◽  
Weed Management ◽  
Selection Pressure ◽  
Cropping System ◽  
Fundamental Principle ◽  
Transgenic Crop ◽  
Economic Returns ◽  
Weed Species ◽  
Eastern Canada ◽  
Herbicide Resistant

This review examines some agronomic, economic, and environmental impacts of herbicide-resistant (HR) canola, soybean, corn, and wheat in Canada after 10 yr of growing HR cultivars. The rapid adoption of HR canola and soybean suggests a net economic benefit to farmers. HR crops often have improved weed management, greater yields or economic returns, and similar or reduced environmental impact compared with their non-HR crop counterparts. There are no marked changes in volunteer weed problems associated with these crops, except in zero-tillage systems when glyphosate is used alone to control canola volunteers. Although gene flow from glyphosate-HR canola to wild populations of bird’s rape (Brassica rapa L.) in eastern Canada has been measured, enrichment of hybrid plants in such populations should only occur when and where herbicide selection pressure is applied. Weed shifts as a consequence of HR canola have been documented, but a reduction in weed species diversity has not been demonstrated. However, reliance on HR crops in rotations using the same mode-of-action herbicide and/or multiple in-crop herbicide applications over time can result in intense selection pressure for weed resistance and consequently, greater herbicide use in the future to control HR weed biotypes. History has repeatedly shown that cropping system diversity is the pillar of sustainable agriculture; stewardship of HR crops must adhere to this fundamental principle. Key words: Canola, Brassica napus, corn, Zea mays, soybean, Glycine max, wheat, Triticum aestivum, gene flow, herbicide resistance, transgenic crop, volunteer crop

scholarly journals Evaluating Gene Flow Using Selected Markers: A Case Study

Genetics ◽  
1998 ◽  
Vol 149 (3) ◽  
pp. 1383-1392 ◽  
Author(s):  
Thomas Lenormand ◽  
Thomas Guillemaud ◽  
Denis Bourguet ◽  
Michel Raymond
Keyword(s):  
Gene Flow ◽  
Insecticide Resistance ◽  
Local Adaptation ◽  
Culex Pipiens ◽  
Selection Pressure ◽  
Fitness Costs ◽  
Southern France ◽  
Culex Pipiens Pipiens ◽  
Selection Intensities

Abstract The extent to which an organism is locally adapted in an environmental pocket depends on the selection intensities inside and outside the pocket, on migration, and on the size of the pocket. When two or more loci are involved in this local adaptation, measuring their frequency gradients and their linkage disequilbria allows one to disentangle the forces—migration and selection—acting on the system. We apply this method to the case of a local adaptation to organophosphate insecticides in the mosquito Culex pipiens pipiens in southern France. The study of two different resistance loci allowed us to estimate with support limits gene flow as well as selection pressure on insecticide resistance and the fitness costs associated with each locus. These estimates permit us to pinpoint the conditions for the maintenance of this pocket of adaptation as well as the effect of the interaction between the two resistance loci.

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