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Recently, there are many reports on production and field test of transgenic plants including forest trees (Hinchee et al., 2011, Kole and Hall, 2008, Walter et al., 2004). However there are arguments and delicate matters about field release of transgenic trees concerning the influence to environment (McLean and Charrest, 2000). Regulations on recombinant DNA plant biotechnology were developed in USA, Canada, Europe, Oceania, China and Japan (Strauss, 2003, Kalaitzandonakes, 2004, Redenbaugh and McHughen, 2004, Lu & Hu, 2011, Watanabe et al., 2004) as well as in international agreement (Strauss et al., 2009). The Conference of the Parties 9 meeting held in Milan 2003 decided recognizing host parties evaluate risks associated with the use of genetically modified organisms by afforestaion and reforestation project activities. Risk assessments shall be carried out in a scientifically sound manner and taking into account recognized risk assessment techniques to identify and evaluate the possible adverse effects of living modified organisms on the conservation and sustainable use of biological diversity (Strauss et al., 2009). Environmental safety is considered in speed of degradation of introduced genes in the soil, impact on soil invertebrates like earthworms, impact on aquatic invertebrates like daphnia, impact on beneficial insects like ladybugs, impact on fish, birds, mammals and other plants. Eucalyptus species has in general allelopathy activity like suppression of growth and germination of understory weeds (Zeng et al., 2008). Poplar has also some allelopathy to the crops like wheat or mycorrhizal fungi in the field (Singh et al., 1993, Olsen et al., 1971).

GMO Safety Assessment-Feasibility of Bioassay to Detect Allelopathy Using Handy Sandwich Method in Transgenic Plants