Glyphosate-drift but not herbivory alters the rate of transgene flow from single and stacked trait transgenic canola (Brassica napus) to nontransgenic B. napus and B. rapa

Jason P. Londo, Michael A. Bollman, Cynthia L. Sagers, E. Henry Lee, Lidia S. Watrud

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Transgenic plants can offer agricultural benefits, but the escape of transgenes is an environmental concern. In this study we tested the hypothesis that glyphosate drift and herbivory selective pressures can change the rate of transgene flow between the crop Brassica napus (canola), and weedy species and contribute to the potential for increased transgene escape risk and persistence outside of cultivation. We constructed plant communities containing single transgenic B. napus genotypes expressing glyphosate herbicide resistance (CP4 EPSPS), lepidopteran insect resistance (Cry1Ac), or both traits ('stacked'), plus nontransgenic B. napus, Brassica rapa and Brassica nigra. Two different selective pressures, a sublethal glyphosate dose and lepidopteran herbivores (Plutella xylostella), were applied and rates of transgene flow and transgenic seed production were measured. Selective treatments differed in the degree in which they affected gene flow and production of transgenic hybrid seed. Most notably, glyphosate-drift increased the incidence of transgenic seeds on nontransgenic B. napus by altering flowering phenology and reproductive function. The findings of this study indicate that transgenic traits may be transmitted to wild populations and may increase in frequency in weedy populations through the direct and indirect effects of selection pressures on gene flow.

Original languageEnglish (US)
Pages (from-to)840-849
Number of pages10
JournalNew Phytologist
Volume191
Issue number3
DOIs
StatePublished - Aug 1 2011
Externally publishedYes

Fingerprint

glyphosate
Brassica napus
Herbivory
Brassica rapa
canola
Transgenes
transgenes
herbivores
genetically modified organisms
Seeds
Gene Flow
Herbicide Resistance
gene flow
Mustard Plant
Lepidoptera
seed productivity
Genetically Modified Plants
Brassica nigra
herbicide resistance
Population

Keywords

  • Brassica
  • Canola
  • CP4 EPSPS
  • Cry1Ac
  • Glyphosate resistance
  • Lepidopteran resistance
  • Transgene flow

ASJC Scopus subject areas

  • Physiology
  • Plant Science

Cite this

Glyphosate-drift but not herbivory alters the rate of transgene flow from single and stacked trait transgenic canola (Brassica napus) to nontransgenic B. napus and B. rapa. / Londo, Jason P.; Bollman, Michael A.; Sagers, Cynthia L.; Lee, E. Henry; Watrud, Lidia S.

In: New Phytologist, Vol. 191, No. 3, 01.08.2011, p. 840-849.

Research output: Contribution to journalArticle

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