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Proc Biol Sci. 2003 August 7; 270(1524): 1565–1571.
PMCID: PMC1691408

Evidence for gene flow via seed dispersal from crop to wild relatives in Beta vulgaris (Chenopodiaceae): consequences for the release of genetically modified crop species with weedy lineages.


Gene flow and introgression from cultivated to wild plant populations have important evolutionary and ecological consequences and require detailed investigations for risk assessments of transgene escape into natural ecosystems. Sugar beets (Beta vulgaris ssp. vulgaris) are of particular concern because: (i) they are cross-compatible with their wild relatives (the sea beet, B. vulgaris ssp. maritima); (ii) crop-to-wild gene flow is likely to occur via weedy lineages resulting from hybridization events and locally infesting fields. Using a chloroplastic marker and a set of nuclear microsatellite loci, the occurrence of crop-to-wild gene flow was investigated in the French sugar beet production area within a 'contact-zone' in between coastal wild populations and sugar beet fields. The results did not reveal large pollen dispersal from weed to wild beets. However, several pieces of evidence clearly show an escape of weedy lineages from fields via seed flow. Since most studies involving the assessment of transgene escape from crops to wild outcrossing relatives generally focused only on pollen dispersal, this last result was unexpected: it points out the key role of a long-lived seed bank and highlights support for transgene escape via man-mediated long-distance dispersal events.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
  • Bartsch D, Lehnen M, Clegg J, Pohl-Orf M, Schuphan I, I, Ellstrand NC. Impact of gene flow from cultivated beet on genetic diversity of wild sea beet populations. Mol Ecol. 1999 Oct;8(10):1733–1741. [PubMed]
  • Beaumont M, Barratt EM, Gottelli D, Kitchener AC, Daniels MJ, Pritchard JK, Bruford MW. Genetic diversity and introgression in the Scottish wildcat. Mol Ecol. 2001 Feb;10(2):319–336. [PubMed]
  • Cain ML, Milligan BG, Strand AE. Long-distance seed dispersal in plant populations. Am J Bot. 2000 Sep;87(9):1217–1227. [PubMed]
  • Hails RS. Genetically modified plants - the debate continues. Trends Ecol Evol. 2000 Jan;15(1):14–18. [PubMed]
  • Laporte V, Viard F, Bena G, Valero M, Cuguen J. The spatial structure of sexual and cytonuclear polymorphism in the gynodioecious Beta vulgaris ssp. maritima: I/ at a local scale. Genetics. 2001 Apr;157(4):1699–1710. [PubMed]
  • Lavigne C, Klein EK, Couvet D. Using seed purity data to estimate an average pollen mediated gene flow from crops to wild relatives. Theor Appl Genet. 2002 Jan;104(1):139–145. [PubMed]
  • Pritchard JK, Stephens M, Donnelly P. Inference of population structure using multilocus genotype data. Genetics. 2000 Jun;155(2):945–959. [PubMed]
  • Raybould AF. Transgenes and agriculture - going with the flow? Trends Plant Sci. 1999 Jul;4(7):247–248. [PubMed]
  • Saeglitz C, Pohl M, Bartsch D. Monitoring gene flow from transgenic sugar beet using cytoplasmic male-sterile bait plants. Mol Ecol. 2000 Dec;9(12):2035–2040. [PubMed]
  • Viard F, Bernard J, Desplanque B. Crop-weed interactions in the Beta vulgaris complex at a local scale: allelic diversity and gene flow within sugar beet fields. Theor Appl Genet. 2002 Mar;104(4):688–697. [PubMed]

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