Genetically modified seeds and plant propagating material in Europe: potential routes of entrance and current status

Genetically modified organisms (GMO), mainly crop plants, are increasingly grown worldwide leading to large trade volumes of living seeds and other plant material both for cultivation and for food and animal feed. Even though all the traded GMOs have been assessed for their safety with regards to human and animal health and the environment, there still are some concerns regarding the potential uncontrolled release in the environment of authorized or unauthorized GM plants. In this review, we identify the possible entrance routes of GM seeds and other propagating plant material in the EU which could be linked to unauthorized release of GMOs in the environment. In addition, we discuss the situation with GM plant cultivation in some non-EU countries in terms of potential risks for GM seed imports. The available body of information suggests that GM seeds and plant propagating material can enter the EU due to problems with labeling/traceability of GM seed lots, contamination of conventional seed lots and accidental release into the environment of grains imported for food and animal feed. Even though cases of uncontrolled release of authorized GMOs, as well as, release of unauthorized GMOs have been reported, they can be generally attributed to adventitious and technically unavoidable presence with little environmental impact. In conclusion, the probability of GM seeds and plant propagating material illegally entering the cultivation in EU is unlikely. However, specific monitoring programs need to be established and maintained to facilitate the compliance of European farmers with the current GMO legislation.