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One of the concerns about ___1___ genetically modified crops has been that vegetation growing in agricultural fields might escape out into the world. Now, for the first time in the U.S., researchers report a large population of ___2___ beyond the farm.
Transgenic canola plants in North Dakota had received genes making them resistant to herbicides, such as the ___3___ killer Roundup. Researchers collected and tested 406 canola plants along thousands of miles of state roads. They found 347 carrying at least one resistance gene. There were also indications that the inserted genes were being passed on to new generations, producing some plants in the wild with multiple transgenes. The findings were presented on August 6th at the annual meeting of the Ecological Society of America in Pittsburgh.
The transgenic canola plants are not about to ___4___ the world. But researchers are obviously curious about how these particular plants managed to make it in places like the edges of parking lots rather than ___5___ fields. Any answers they find will likely affect future biotechnology regulation.
working with GM crops weed take over pampered
人们对转基因作物的疑虑之一在于这些作物的改良基因可能会从农田蔓延至全世界。如今，美国研究人员发布的一项科研报告首度揭示了转基因作物远不只存在于农田。 种植于北达科他州的转基因油菜中植入了抗除草剂基因，使之对“农达”等除草剂产生抗性。研究人员沿着数千英里的国道收集了406株油菜。经检测，其中有347株至少携带一种抗性基因。另有迹象表明，油菜中植入的外源基因传给了下一代，导致某些野生植株也获得了多种改良基因。该研究成果在8月6日匹兹堡举行的美国生态协会年度会议上进行了发布。（作者：梅瑞迪斯·谢弗等，阿肯色大学） 虽然转基因油菜还不会泛滥成灾，占领全世界，但研究人员显然非常关心，这些特殊农作物是如何在停车场的角落这类地方生存下来的。要知道，这些地方可不比肥沃的农田养料多。他们找到的答案无论是什么，都有可能对未来的生物技术管理造成影响。