Cotton cultivation has a long history, and my country’s annual planting area reaches nearly 100 million acres. Cotton also has an important impact on the development of the national economy. Since the 1990s, my country's cotton production has undergone two fundamental changes: first, Bt insect-resistant cotton has replaced traditional cotton varieties, and second, the popularization of the use of methylamine control technology has become a key factor in preventing cotton plants from growing excessively. a routine measure of production.
With the continuous expansion of production, research has found that the early growth potential of transgenic insect-resistant cotton is too weak, It is prone to premature senescence in the later stages and unstable insect resistance during the growth period (the insecticidal properties of the leaves vary between different growth periods and different growth parts. Under conditions such as drought, rain, and waterlogging, the insecticidal properties of the leaves decrease significantly) , aphids and blind stink bugs are causing more damage. Under the above circumstances, the traditional chemical control technology using mediamine will not be able to effectively solve the problems of early growth retardation and late premature aging of insect-resistant cotton, let alone the problem of insect resistance of insect-resistant cotton.
How to solve the technical problems that arise in the production process of Bt insect-resistant cotton and ensure stable and high yield of cotton has become an important issue for agricultural scientific research experts to solve, and has also received great attention from relevant national departments. With many years of scientific research experience in the field of crop chemical regulation, the cotton cultivation physiology expert team of the Institute of Crop Science, Chinese Academy of Agricultural Sciences, with the support of special funds such as the National Natural Science Foundation of China and the National "863" Program, has focused on practical problems existing in Bt cotton production. Applying advanced technology and methods, in 2003, we developed a special high-efficiency regulator for cotton - Cotton Tontianbao. According to the growth characteristics of Bt insect-resistant cotton in different periods, it promotes the growth and development of cotton and improves the resistance to cotton bollworm. , improve the resistance to aphids and blind stink bugs, improve the boll-setting ability of cotton, promote cotton boll development, and improve the yield and quality of lint cotton, enriching the family series of cotton tontianbao (special cotton tontianbao in the early bud stage) , special-purpose cotton tontianbao for the blooming period, and special cotton tontianbao for the full-bell stage), which effectively solve the main problems existing in the field production of Bt genetically modified insect-resistant cotton. The Institute of Crop Science of the Chinese Academy of Agricultural Sciences transferred the patent for this technology to Heilongjiang Hetian Fengze Xingnong Technology Development Co., Ltd. The company is responsible for full production and promotion, which has brought positive promotion to the production of genetically modified cotton.
Cotton Tontianbao has the characteristics of high scientific and technological content, remarkable effects, safe use, and high input-output ratio. Since 2004, it has been used in the main cotton producing areas of Xinjiang, Shandong, Jiangsu, Zhejiang, and Anhui. , Henan, Hebei, Shanxi, Shaanxi and other places arranged test demonstrations, and all achieved good test results.
The test demonstration results show that the application of Cotton Tontianbao to systematically control Bt insect-resistant cotton can not only create ideal yield-increasing populations, improve light energy utilization, and reduce buds caused by excessive growth and excessive shade. In addition to boll shedding and rotting, increasing boll weight and clothing score, it can also improve the expression ability of insect-resistant genes in Bt insect-resistant cotton and improve the insect resistance of transgenic insect-resistant cotton. Experiments have proven that the growth rate of Bt insect-resistant cotton is negatively correlated with the expression of resistance genes to cotton bollworms. Cotton Tiantianbao's full-process chemical control effectively regulates the vegetative growth, reproductive growth and insect-resistant gene expression of transgenic insect-resistant cotton. The relationship between them has achieved the double win-win situation of the healthy and stable growth of Bt insect-resistant cotton and the large-scale synthesis of insect-resistant proteins, and has achieved the effective unification of high-yielding population construction and acquisition of high insect resistance. Four consecutive years of experiments in cotton fields in North China have shown that in early July, the plant height of genetically modified insect-resistant cotton systematically controlled by Cotton Tontianbao was less than 60 cm. When the second-generation cotton bollworm occurred, the top damage rate was less than 3 %, the budding damage rate is less than 5%; while the genetically modified insect-resistant cotton that has not been systematically controlled by Cotton Tontianbao has a plant height of about 80 cm, the top damage rate is about 20%, and the budding damage rate is as high as 40%.