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Edible Cotton
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| Bryan Walsh Time, Sept 4, 2009 |
It's as true in today's world as it was in the antebellum South: cotton is king. The plant has been cultivated for its fiber for over 7,000 years, and today it's grown by more than 20 million farmers in some 80 countries. But while cotton accounts for nearly 40% of the fiber used worldwide to make clothing, there's one thing the plant has never been able to do well: feed people. Cottonseeds are a rich source of protein--the current cotton crop produces enough seeds to meet the daily requirements of half a billion people a year. But the seeds can be consumed only after an extensive refining process removes the gossypol, a toxic chemical that helps protect the plant from insect and microbe infestation. "People, pigs, chickens--none of us can stomach gossypol," says Kater Hake, vice president of agricultural research for the industry group Cotton Inc. Only cows and other ruminants can handle it.
Remove the gossypol, however, and you'd have a cheap and abundant form of protein for everyone. But get rid of all the gossypol, as plant breeders did in the 1950s, and insects will devour the defenseless cotton. Enter Keerti Rathore, a professor at Texas A&M University, who found a way around the problem through genetic engineering. In new field-trial data, Rathore's team demonstrated that it can turn off the genes that stimulate the production of gossypol in the cottonseeds while the rest of the plant keeps its natural defenses
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