Gene flow in genetically modified herbicide tolerant oilseed rape (Brassica napus) in the UK

The environmental and agronomic impact of genetically modified (GM) herbici de tolerant oilseed rape has been studied by NIAB since 1995. This paper re ports on results of gene flow frequencies recorded between trial plots at s everal National List sites and at a large scale release of genetically modi fied herbicide tolerant rape in. the UK. Levels of cross pollination tended to decrease with increasing distance from the pollen source, there was som e evidence of varietal differences in receptiveness to foreign pollen. Poll en dispersal was also recorded at distances of up to 400m from a large rele ase of GM herbicide tolerant rape using male sterile 'bait' plants.