美国 Calgene 公司(在加利福尼亚州戴维斯)已经得到美国农业部批准,对 rDNA 烟草进行小规模的田间试验。将对用细菌载体工程操作过的两组植物进行试验:一组抗除草剂溴苯腈,另一组抗草甘膦。试验将在若干预防措施方面受到监视(这些措施已成为 rDNA 植物试验中的例行措施),包括在开花之前摘除植物的顶部以防结籽,在10.4英亩的试验区周围设置缓冲区和链索栅栏。美国农业部的动物和植物健康检查处说,该试验不会对环境有什 Calgene, Calif., In Davis, Calif., Has been approved by the U.S. Department of Agriculture for a small field trial of rDNA tobacco. Two groups of plants that have been engineered with bacterial vectors will be tested: one for the herbicide bromoxynil and the other for glyphosate resistance. The tests will be monitored in a number of precautionary measures (these have become routine in rDNA plant tests), including removal of the top of plants before anthesis to prevent seed setting, provision of buffers and strands around a 10.4-acre trial area Fence. The animal and plant health check-ups of the U.S. Department of Agriculture said the test will not be environmentally specific