Abstract:

【Objective】 To assess the potential ecological risk for weediness of transgenic soybean 40-3-2, which was introduced as production raw material for edible oil, and to verify the operation of clauses for weediness assessment of transgenic soybean in China. 【Method】 In the field, the surviving competition ability (including germination rate, plant height, leaf number), reproducing ability (the number of flowers, legumes, and seeds per plant), volunteer possibility, seed shattering and persisting possibility of transgenic glyphosate-resistant soybean 40-3-2, recipient variety and conventional soybean varieties were comparatively evaluated. 【Result】 The surviving competition ability of transgenic glyphosate-resistant soybean was less than that of conventional soybean variety which was similar with that of recipient soybean in appropriate season. However, the surviving competition ability of three soybean varieties was similar in appropriate season. The number of flowers was also similar among the three varieties in appropiate season, but the number of legumes and seeds per plant of transgenic glyphosate-resistant soybean and recipient soybean were less than that of conventional soybean variety in appropriate season. The number of flowers, legumes and seeds per plant of conventional soybean variety were a little bit less than that of transgenic glyphosate-resistant soybean and recipient soybean in unfavorable one. The seed shattering and persisting ability of all experimental soybean varieties were weak. And no volunteer plant was observed in experimental period. 【Conclusion】 It is concluded that the transgenic glyphosate-resistant soybean from Monsanto Company had lowest potential weediness when it was planted or was imported as production raw materials for edible oil in Nanjing, China. It was verified that the items on weediness in the evaluation standard of environmental safety are practical through the field trial.

Key words: transgenic glyphosate-resistant soybean, weediness, safety assessment