here comes the genetically modified salmon, and you can still eat it safely.
We are no strangers to genetically modified foods since their birth, but most consumers still choose non-genetically modified foods because of safety or price. However, with the progress of technology, people's views on genetically modified foods are gradually changing. They no longer talk about "turning" color change as they did a few years ago, and the genetically modified foods on the market tend to be diverse, from a single genetically modified crop food to genetically modified animal food. ?
In p>215, the United States approved genetically modified salmon for human consumption. After two years, the first sale of genetically modified salmon was finally completed in Canada. It is reported that this kind of genetically modified salmon can grow rapidly in cold conditions, and it can grow up in just 18 months, and its size is larger than that of similar non-genetically modified salmon, so it can meet people's consumption needs more quickly and more. ?
genetically modified salmon and normal-sized salmon (source network)?
It is a great leap for genetically modified salmon to enter the market. After all, it has gone through two years of hardships from being approved for consumption to actually entering the market, which is not easy. ?
so why are genetically modified foods so resistant? We can learn about the development history of genetically modified food first. ?
the "evolution" history of genetically modified food?
in p>1983, the first transgenic crop came out in the United States. In 1986, genetically modified crops went out of the laboratory and were planted in the field with the approval of the US government. On May 18, 1994, the Federal Food and Drug Administration of the United States officially approved the first transgenic crop-tomato for sale, but it must be specially noted, thus creating a precedent for the commercialization of transgenic plants. ?
California Gene Company used their patented bio-gene technology to copy the genes causing rot in tomatoes, and then injected them back into tomatoes in the reverse direction, thus stopping the internal rot process of tomatoes. ?
this technology can be applied to any crops, and any bad traits can be removed. Because this kind of tomato is not perishable, it is not only convenient for transportation and storage, but also allows it to stay in the plant for a longer time, fully absorb sunlight, and then transport it to the market for sale after it is fully mature. It can be preserved for a long time and still has the "taste of summer maturity". This technology can be applied to any crops, and it can also get rid of any bad traits in crops. ?
genetically modified tomatoes?
transgenic technology has significantly improved the quality and yield of crops, so it has been rapidly popularized and has become a widely used improved variety cultivation technology. By 2, the planting area of genetically modified crops in the world has reached 44.2 million hectares, of which soybeans account for 58%; Corn accounts for 23%%; Cotton accounts for 12%. In the global total output of genetically modified crops, the United States accounts for 68%. ?
the development of genetically modified food in China?
China began to import genetically modified soybeans in 1997, and at present, eight varieties of genetically modified soybeans have been approved for import as processing raw materials. At present, cotton, rice, corn and papaya have been granted safety certificates in China, but only cotton and papaya have been approved for commercial cultivation; Genetically modified crops approved for import as processing raw materials include soybeans, corn, rape, cotton and sugar beet, and these foods must obtain safety certificates in China. ?
As for genetically modified animal food, there is only one country in the world, Canada, which we mentioned earlier. ?
Genetically modified crops have actually caused a heated debate since they were born. ?
Opponents raised objections from the perspectives of food safety, gene diffusion and ecological imbalance. And the cause also justifiably refuted them one by one. The debate about the advantages and disadvantages of genetically modified foods is still going on, and there is no conclusion yet. At least at present, there is no sufficient evidence that genetically modified crops and foods will lead to harmful consequences to people, animals, plants and the ecological environment, and there is no report of health damage caused by consumers eating genetically modified foods. ?
today, we have been able to gradually get rid of the original fear of genetically modified food and face up to the importance of genetically modified food for food security. But what kind of Bt transgenic rice is still in the research and development stage, which is very important for China's food security? Scientists say this kind of rice is safe to eat. Is it true? ?
Bt transgenic rice?
Bt protein is a kind of protein produced by Bacillus thuringiensis. It has become a kind of microbial pesticide with the largest output and the widest application at present because of its safety and high efficiency. It is the main exogenous gene product of transgenic insect-resistant rice at present, and has been used safely as a pesticide to control pests for nearly 1 years. ?
there are two processes from Bt protein to toxic protein to insecticidal effect:?
1.Bt protein is hydrolyzed by protease in alkaline environment to produce active toxin protein; ?
2. The specific receptors in the midgut epithelial cells of insects (only in specific insects) bind with toxin proteins, thus causing perforation of the intestinal cell membrane of insects, destroying the osmotic balance of cells, swelling and dissolving the cells, and finally leading to the death of insects. ?
schematic diagram of the action mechanism of p>Bt protein?
However, the epithelial cells of human digestive tract have no receptor that can bind to toxin protein (the receptor only exists in specific insects). Even if Bt protein is hydrolyzed smoothly, the toxin protein produced can't function without binding receptor. Therefore, we can understand that this transgenic rice is harmless to human body. ?
What's more, China's research and application management of genetic modification is very strict. It can be said that it must be one of the strictest countries, if not the strictest in the world. As early as 1996, the Ministry of Agriculture issued the Implementation Measures for Safety Management of Agricultural Biogenetic Engineering. Later, in 21, the State Council promulgated the Regulations on the Safety Management of Agricultural Genetically Modified Organisms, which managed the whole process of the research, experiment, production, processing, management, import and export of agricultural genetically modified organisms in China. ?
At present, the Ministry of Agriculture also organizes relevant local departments to take samples of experimental and propagating materials planted by scientific research units and seed companies for genetically modified detection every year, so as to prevent the indiscriminate planting and illegal diffusion of genetically modified materials. It can be seen that China's approval and supervision of genetic modification is very cautious and strict. ?
what is the general process of GM crop management in China?
At present, China's agricultural production is facing the problem of increasing abuse of chemical pesticides and fertilizers. Genetically modified cotton with less demand for pesticides, genetically modified corn with less demand for fertilizers, and even genetically modified rice with less demand for irrigation ... Scientists just hope to provide a good medicine for food safety, environmental protection and more effective use of resources in China by popularizing these genetically modified crops. ?