Medo da tecnologia?
Biotechnology can also help protect and restore tree species that are threatened by pests and disease. For example, the American chestnut was devastated by an introduced fungal disease that killed more the 3.5 billion trees in the first half of the 20th century. These majestic trees could reach 100 feet in height and five feet in diameter. The chestnut had been the dominant hardwood species throughout the Appalachian Mountains. An enterprising squirrel, we are told, could travel from Maine to Georgia without touching the ground through the interlinked branches of chestnut trees. Now scientists at the University of Georgia and the State University of New York are investigating ways to insert blight-resistance genes into American chestnut artificial seed embryos. Thanks to biotechnology, the American chestnut could be restored later this century to the forests from which it has been missing for nearly two generations.
Claudio
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