The Transgenic Issue
The rise of the organic food movement has always somewhat perplexed me. Having grown up on Kraft Mac n’ Cheese, I never really gave much thought to where my food came from (a box) or what went into it (1 cup of water and microwave radiation). Still, I can appreciate the desire not to ingest chemicals I can’t pronounce. Genetically modified foods, on the other hand, don’t really bother me. I’m okay with the idea that my tomatoes have a few non-coding “foreign” DNA sequences as long as the procedure contributed other benefits, such as disease resistance or enriched vitamin content. However, some people fear that these extra sequences or the procedure itself could prove harmful to humans in the long run. Judging by the continued expansion of organic food aisles in grocery stores, this is a big concern among the general public despite known government safety testing.
The resulting challenge for scientists is to develop a method of improving crops without introducing these “potentially harmful” sequences people find so objectionable. Thus enters the concept of precision breeding, which has recently been used to give rice the ability to breathe underwater. According to the CNN article, Dr. Pamela Ronald and a team at UC Davis have managed to introduce a novel gene from a low-yield rice variety into a commonly used high-yield variety that will enable it to survive up to 17 days completely underwater – almost 6x longer than the regular species. The new plants were tested in rice-loving India and Bangladesh, where massive flooding has severely reduced crop yields in recent years. The neat trick is that they managed to do this without introducing any of the non-related DNA traditionally used as vectors in genetic engineering. Precision or smart breeding instead uses knowledge of the plant genome to make informed breeding matches to generate the hybrid of choice – no test tubes involved. It’s a technique that’s been around for a few years and is gaining momentum among plant breeders and researchers, who have dubbed it “green biotech.” It’ll be interesting to see how this plays out in the supermarket over the next decade or so.