Wednesday, July 21, 1999 Published at 16:56 GMT 17:56 UK
GM crops without foreign genes
The new technique does not involve transfering genes
By BBC News Online Science Editor Dr David Whitehouse
Scientists may soon be able to produce genetically-modified (GM) crops without transferring genes between species.
The method might be an answer to the objections of groups opposed to GM crops who say that, for example, taking an anti-freeze gene from a fish and inserting it into a strawberry is unnatural and dangerous.
The technique is described in the Proceedings of the National Academy of Sciences.
It involves preparing a section of DNA and RNA, the molecules that hold the organism's genetic blueprint.
The DNA/RNA molecule is called a chimeraplast. It attaches itself to the specific part of the gene that needs changing.
Farmers may benefit
Dr Chris Baszczynski, one of the scientists involved, said that the technique "doesn't use anything physically from the source gene. The changes are all chemically synthesised."
Dr Charles Arntzen, another of the researchers, believes the new technology "would be used to benefit farmers and food producers".
"We may one day be able to quickly reduce caffeine in coffee beans, or shorten the long-chain fatty acids found in plants like soybeans - making the fat in them more heart-healthy like olive oil."
Working with corn, the scientists created a strain resistant to a herbicide. They based it on a natural mutation found in some strains of corn.
Despite the technique not involving the transfer of genetic material between species, many opponents of genetic research may still not approve of this work which still involves altering an organism's genetic code.