Wednesday, April 28, 1999 Published at 17:45 GMT 18:45 UK
GM plants eat explosives
In the laboratory, tobacco plants have eaten up explosives
Soil polluted by high explosives could be cleaned up by simply growing plants on it.
"Effectively they use the explosives as a food source," says Dr Neil Bruce of Cambridge University's Institute of Biotechnology, who lead the research.
"The bacteria would take centuries to break down the explosives, but the plants would clean up the soil in just years," he told the BBC.
"Some of these sites are literally on the verge of exploding," says Dr Hooker. "They also present serious exposure risks to humans and wildlife. This is a new option for cleaning up these toxins and mutagens and could soon become a reality."
Soils near ammunition factories and dumps can contain up to 20% explosives. Currently, this has to be dug up and passed through an incinerator. But this is very expensive.
Newer ideas have tried to use fungi and microbes to break down the dangerous compounds but this still involves costly excavations.
Some plants, like sugar beet, have shown promise but only remove the explosives partially and very slowly. In some cases the breakdown products are new toxins.
Grow and degrade
Using the new genetically-engineered plants suffers none of these drawbacks. The plants simply grow on the land and completely degrade the explosives.
Dr Bruce believes the plants will be more acceptable to the public, as they will create greenery on previously barren sites.
The laboratory experiments have been done using the tobacco plant. But the poplar is more likely to be put into use as it has long, deep roots and grows quickly.
Dr Bruce's team are currently working on other genetically-engineered plants to destroy solvent chemicals.