The Evolution of Natural Plant Communities through Crop Migration and Crop-to-weed Gene Flow

<p>With the rising demand for food and biofuels, the efficiency of crop production has become vital to assuring food security. Genetically engineered (GE) crop varieties are broadly thought to be a solution for improving the efficiency of crop production, but concerns regarding their release have heightened as more discoveries have focused on the influence of genetically engineered crops on native and weedy plant species. Risk assessment of GE crop varieties focuses on two main areas: feralization of crop systems and crop-weed hybridization. Risks include naturalization, transgene introgression, and the formation of novel genotypes in natural systems. In this study, roadside surveys and sentinel plant experiments were conducted in North Dakota, U.S.A. in order to assess the risks facing natural plant communities by crop migration and crop to weed gene flow. We documented the establishment of transgenic, persisting canola (Brassica napus L.) populations on a large spatial scale in the U.S.A. and the development of novel genotypes within these populations. We also identify species and population level differences in hybridization rates between transgenic canola and weedy Brassica species within a commercial field environment.</p>

Name thesis:degree_name

Master of Science in Biology (MS)

Level thesis:degree_level

Thesis

Year dc:date.available

2012

Author dc:creator

• Schafer, Meredith G.

Advisor dc:contributor.advisor

• Sagers, Cynthia L.

Contributors dc:contributor

• Etges, William J.
• Evans-White, Michelle A.

• Biological sciences
• Agroecology
• Brassicaceae
• Transgene flow
• Agronomy and Crop Sciences
• Food Security
• Plant Biology
• Plant Breeding and Genetics

Repository record dc:identifier

https://scholarworks.uark.edu/etd/458

OAI identifier oai:identifier

oai:scholarworks.uark.edu:etd-1457