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Many plants are naturally GMO, research finds
Joan Conrow | Cornell Alliance for Science

Though much of the controversy around genetically modified crops is driven by the belief that the process of moving genes from one species to another is “unnatural,” new research shows some 1 in 20 flowering plants are naturally transgenic. Dozens of plants, including bananas, peanuts, Surinam cherries,  hops, cranberries and tea, contain the Agrobacterium microbe — the very same bacterium that scientists typically use to create GM crops. The research follows on the heels of the 2015 discovery that sweet potatoes are naturally transgenic. Agrobacterium DNA also has been found in tobacco plants.The findings were reported in a paper published Sept. 21 in the journal Plant Molecular Biology. Researchers studied the genomes of some 356 dicot species and found 15 naturally occurring transgenic species. “Thus, HGT [horizontal gene transfer] from Agrobacterium to dicots is remarkably widespread,” the abstract stated.

As Michael Le Page wrote in New Scientist:

It has also been discovered that the horticultural process of grafting different plants together can lead to the exchange of genes, meaning humans have inadvertently been creating transgenic plants for millennia. From genome studies, we can see that gene swapping has been going on since the dawn of life.

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