Limited ecological risk of insect-resistance transgene flow from cultivated rice to its wild ancestor based on life-cycle fitness assessment

文献类型： 外文期刊

第一作者： Li, Lei

作者： Li, Lei;Yang, Xiao;Wang, Lei;Yan, Huanxin;Lu, Bao-Rong;Su, Jun;Wang, Feng

作者机构：

关键词： Environmental impact;Fecundity and survival;Genetically modified organisms;Lepidopteran;Oryza sativa;Wild relative

期刊名称：SCIENCE BULLETIN （ 影响因子：11.78； 五年影响因子：7.658 ）

ISSN： 2095-9273

年卷期： 2016 年 61 卷 18 期

页码：

收录情况： SCI

摘要： Ecological impact caused by transgene flow from genetically engineered (GE) crops to their wild relatives is largely determined by the fitness effect brought by a transgene. To estimate such impact is critical for the ecological risk assessment prior to the commercialization of GE crops. We produced F-1 and F-2 hybrid descendants from crosses of two insect-resistant GE rice lines (Bt, Bt/CpTI) and their non-GE rice parent with a wild rice (Oryza rufipogon) population to estimate the transgenic fitness. Insect damages and life-cycle fitness of GE and non-GE crop-wild hybrid descendants as well as their wild parent were examined in a common-garden experiment. No significant differences in insect damages were observed between the wild rice parent and GE hybrid descendants under high-insect pressure. The wild parent showed significantly greater relative survival-regeneration ratios than its GE and non-GE hybrid descendants under both high- and low-insect pressure. However, more seeds were produced in GE hybrid descendants than their non-GE counterparts under high-insect pressure. Given that the introduction of Bt and Bt/CpTI transgenes did not provide greater insect resistance to crop-wild hybrid descendants than their wild parent, we predict that transgene flow from GE insect-resistant rice to wild rice populations may not cause considerable ecological risks.

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