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Virus-resistant grapevines
Date:7/2/2009

This release is available in German.

A good wine needs to ripen. But it's a long way to the barrel. Even before the harvest, the grapevines have to overcome all kinds of obstacles. Extremely hot or rainy periods can destroy entire crops, not to mention the wide variety of pests that can appear on the scene. Bugs such as the vine louse or the rust mite, fungi such as mildew, or viruses such as the "Grapevine fanleaf virus" (GFLV for short) can give the vines a hard time. The GFLV infects the grapevine and causes fanleaf disease, resulting in deformed and very yellowed leaves, smaller grapes and crop loss.

However, there will soon be a cure for GFLV infections: Researchers at the Fraunhofer Institute for Molecular Biology and Applied Ecology IME in Aachen are making certain plants resistant to the GFLV by genetic engineering. "Our modified plants produce antibodies," explains Dr. Stefan Schillberg, head of department at the IME. "These antibodies 'recognize' the viruses and prevent them from spreading in the plant and causing damage." To enable the plant to produce the antibodies, the scientists have to modify its genotype and channel genetic information for the antibodies into it. This task is performed by tiny helpers called agrobacteria, which genetic engineers have been using for over twenty years. These are soil bacteria that inherently transfer parts of their own genome to that of the plant. Using simple routine processes, the researchers introduce the antibody gene into the bacteria, which then act as a transport vehicle and carry it over to the vine.

The researchers are still testing this process on model plants, and the first results show that their modified versions are up to 100 percent resistant to the virus. "The antibody is produced very effectively inside the plants," says Schillberg. "The next step on the agenda is to test the
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Contact: Stefan Schillberg
stefan.schillberg@ime.fraunhofer.de
49-241-608-511-051
Fraunhofer-Gesellschaft
Source:Eurekalert  

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Virus-resistant grapevines
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