International Herald Tribune The researchers of Danish company "Aresa" developed a genetically modified cress plant under the guidance of Professor Karsten Meyer of the University of Copenhagen. The plant can change its color and indicate that it is buried around it. Land mines. Using this method of mine clearance may make a positive contribution to saving thousands of lives. This kind of transgenic cress is very sensitive to the nitrogen dioxide gas released by the landmines in the soil. As long as it grows for 3 to 5 weeks in this place, the color of its leaves will change from green to red. However, the team did not know how sensitive the plant was to nitrogen dioxide. So it is not clear how much gas is needed to make it green from red. They hope that this technology can pass field trials. Once it is successful, it will greatly speed up the process of mine clearance. At present, with the most commonly used mine detection technology, one person can only inspect and clean minefields of two square meters a day. Meyer said: "The speed of burying mines is much faster than clearing them." Researchers manipulate the natural mechanism that turns red leaves in the autumn - the gene that produces red pigments - anthocyanins - to change the color of the plant. The gene is turned off most of the year. The team injected a gene that enabled the red pigment to open when it encountered nitrogen dioxide. Alessa is currently developing a spray gun that can safely and cheaply sow the plant. They are also developing plants that can respond to other pollutants including cadmium and nickel. In this way, the heavy metal contaminants in the soil can be promptly removed. The research team has already taken steps to prevent this genetically engineered plant from spreading to the wild. They remove an important growth hormone from the gene, so the growth of this plant requires a specially designed fertilizer. However, Greenpeace spokesperson Ben Araf said: "Technology is not the best solution to the land-mine problem. Now that there is an effective way to deal with the land-mine problem, it lacks the corresponding political resolve. The ultimate solution should be first of all not to Mine is buried again." (Wei Wei)
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