The reporter learned recently at the South China Botanical Garden that the research team headed by Duan Jun’s research team has spent nearly eight years of hard exploration and has successfully developed herbicide-tolerant bar transgenic rice and anti-senescent transgenic PSAG12-ipt rice using genetic engineering techniques. . According to Duan Jun's researcher, the bar-transgenic rice plants passed the intermediate and environmental release tests stipulated by the Ministry of Agriculture's "Agricultural Biogenetics Safety Management Implementation Measures" in 2003 and 2004, respectively. The results showed that the bar genes were transferred. It can be stably inherited and can fully express its resistance to herbicides at different growth stages without gene silencing and gene drift. In 2005, it was officially approved for production trials. Using this result, the purity of hybrid rice seeds can be identified quickly and accurately, and the purity identification procedure can be simplified while the purity identification cost can be saved. At the same time, this research result can be used for the cultivation of super hybrid rice and the safe production of two-line hybrid rice. There are also important application values ​​for mechanized seed production of hybrid rice. Transgenic technology can separate specific genes such as insect resistance, disease resistance, anti-aging, herbicide resistance, and other useful genes from plants, animals, and microorganisms into rice varieties, so that rice can produce traits that it does not have, so that breeders can keep The pursuing directional improvement of rice has become possible, opening up a new way for rice breeding. According to reports, in 2004, a total of 17 countries around the world planted genetically modified crops, with a total area of ​​81 million hectares. The crops involved include soybeans, corn, cotton and canola. From the perspective of the imported foreign genes, the largest planting area in the world is herbicide-resistant transgenic crops, followed by transgenic crops with insect-resistance characteristics. In 2004, a total of 58.6 million hectares of herbicide-tolerant GM crops were planted worldwide. China has always attached great importance to the research of genetically modified technology and has set up a special “national research and industrialization project for genetically modified plants” to support this research. The current progress is very rapid. According to statistics, from 1998 to 2004, the cultivation of genetically modified crops in China has increased from less than 500,000 hectares to 3.7 million hectares (only 5% of the world's total planted area), but the application is very careful. According to the "Implementation Measures for the Safety Management of Agricultural Biological Gene Engineering" of the Ministry of Agriculture, the large-scale application of genetically modified crops must go through four stages, namely, experimental research, intermediate experiments, environmental release, and production tests, and at the same time make an accurate assessment of its safety. . At present, the genetically modified crops that have been approved for production and application by the Ministry of Agriculture include cotton, tomatoes, and sweet peppers.

API

what is API?

High-purity plant monomer refers to one or more single chemical components with specific biological activity or pharmacological effects extracted from plants, and its purity is usually high, meaning that the content of the component in the extract reaches a certain percentage, and the content of other impurities or irrelevant components is low.

These plant monomers are usually secondary metabolites of plants, such as flavonoids (flavonoids), alkaloids (alkaloids), terpenoids (terpenoids), phenolics (phenolics), etc., which play a variety of physiological functions in plants such as defense, signal transduction, and antioxidant. Due to their pharmacological activity, high-purity plant monomers are often used in pharmaceuticals, health products, cosmetics and other biotechnology products.

For example, Naringenin is a high-purity plant monomer extracted from citrus plants with antioxidant and anti-inflammatory activities; Corosolic acid is a high-purity active monomer extracted from loquat leaves, which is considered to be effective in treating type 2 diabetes and obesity.

Extraction and preparation of high-purity plant monomers usually require a complex separation and purification process, including extraction, column chromatography, crystallization, recrystallization and other steps to ensure the purity and activity of the final product. These processes may be required by specialized biotechnology companies.

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