Environmental risk assessment of transgenic miraculin-accumulating tomato in a confined field trial in Japan

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  • Hiwasa-Tanase Kyoko
    Faculty of Life and Environmental Sciences, University of Tsukuba Tsukuba-Plant Innovation Research Center, University of Tsukuba
  • Yano Tsubasa
    Inplanta Innovations, Inc.
  • Kon Tatsuya
    Inplanta Innovations, Inc.
  • Terakawa Teruhiko
    Inplanta Innovations, Inc.
  • Ezura Hiroshi
    Faculty of Life and Environmental Sciences, University of Tsukuba Tsukuba-Plant Innovation Research Center, University of Tsukuba

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<p>The commercial use of genetically modified (GM) crops requires prior assessment of the risks to the environment when these crops are grown in the field or distributed. Assessments protocols vary across countries and GM crop events, but there is a common need to assess environmental biosafety. In this study, we conducted an environmental risk assessment in a confined field of GM tomato plants that can produce miraculin, a taste-altering protein that causes sour tastes to be perceived as sweet, for practical use in Japan. The evaluation was conducted for 1) competitiveness (the ability to compete with wild plants for nutrients, sunlight, and growing areas and prevent their growth) and 2) the production of toxic substances (the ability to produce substances that interfere with the habitat and growth of wild plants, animals, and microorganisms). Investigations of plant morphology and growth characteristics as well as tolerance to low temperature during early growth and overwintering for assessment endpoints related to competitiveness showed no biologically meaningful difference between GM tomato and non-GM tomato. In addition, harmful substances in plant residues and root secretions were assessed by the plow-in method, succeeding crop test and soil microflora tests, and it was determined that GM tomato does not exhibit an increase in harmful substances. Based on these results, it was concluded that GM miraculin-accumulating tomato is comparable to conventional tomato and is unlikely to have unintended adverse effects in the natural environment of Japan.</p>

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