Concerns exist that transgenic crop × weed hybrid populations will be more vigorous and competitive with crops compared with the parental weed species. Hydroponic, glasshouse, and field experiments were performed to evaluate the effects of introgression of Bacillus thuringiensis (Bt) cry1Ac and green fluorescent protein (GFP) transgenes on hybrid productivity and competitiveness in four experimental Brassica rapa × transgenic...

Rapeseed Brassica napus L. transgenic for a Bacillus thuringiensis ( Bt ) transgene was developed and was shown to be insecticidal towards certain caterpillars including the diamondback moth Plutella xylostella L. and the corn earworm Helicoverpa zea Boddie. To simulate an escape of the transgenics from cultivation, a field experiment was performed in which transgenic and nontransgenic rapeseed plants were planted in natural v...