Hu Ning, Hu Ji-Chao, Jiang Xiao-Dong, Xiao Wei, Yao Ke-Min, Li Liang, Li Xin-Hai, Pei Xin-Wu
Yale-NUIST Center on Atmospheric Environment International Joint Laboratory on Climate and Environment Change Nanjing University of Information Science & Technology Nanjing China.
Jiangsu Key Laboratory of Agricultural Meteorology Nanjing University of Information Science & Technology Nanjing Jiangsu China.
Evol Appl. 2022 Mar 11;15(3):471-483. doi: 10.1111/eva.13361. eCollection 2022 Mar.
On the coexistence of genetically modified (GM) and non-GM maize, the isolation distance plays an important role in controlling the transgenic flow. In this study, maize gene flow model was used to quantify the MTD and MTD in the main maize-planting regions of China; those were the maximum threshold distance for the gene flow frequency equal to or lower than 1% and 0.1%. The model showed that the extreme MTD and MTD were 187 and 548 m, respectively. The regions of northern China and the coastal plain, including Hainan crop winter-season multiplication base, showed a significantly high risk for maize gene flow, while the west-south of China was the largest low-risk areas. Except for a few sites, the isolation distance of 500 m could yield a seed purity of better than 0.1% and meet the production needs of breeder seeds. The parameters of genetic competitiveness () were introduced to assess the effects of hybrid compatibility between the donor and recipient. The results showed that hybrid incompatibility could minimize the risk. When = 0.05, MTD and MTD could be greatly reduced within 19 m and 75 m. These data were helpful to provide scientific data to set the isolation distance between GM and non-GM maize and select the right place to produce the hybrid maize seeds.
关于转基因（GM）玉米和非转基因玉米的共存，隔离距离在控制转基因漂移方面起着重要作用。本研究利用玉米基因流模型对中国主要玉米种植区的最大阈值距离（MTD）和最小阈值距离（MTD）进行了量化；即基因流频率等于或低于1%和0.1%时的最大阈值距离。模型显示，极端的MTD和MTD分别为187米和548米。中国北方地区和沿海平原，包括海南作物冬季繁殖基地，玉米基因流风险显著较高，而中国西南部是最大的低风险区域。除少数地点外，500米的隔离距离可使种子纯度优于0.1%，满足育种种子的生产需求。引入遗传竞争力（）参数来评估供体和受体之间杂交亲和性的影响。结果表明，杂交不亲和性可将风险降至最低。当=0.05时，MTD和MTD可在19米和75米内大幅降低。这些数据有助于为设定转基因玉米和非转基因玉米之间的隔离距离以及选择合适的地点生产杂交玉米种子提供科学依据。
