After 12 years of hard work, the research team led by Fan Xingming, a researcher of the Yunnan Academy of Agricultural Sciences' Grain Crops Research Institute, succeeded in breeding a high-yield corn Yunrui 21 (Yunyou 21). This is the first tropical white high-oil corn variety at home and abroad selected from Yunnan's original tropical white high-oil corn germplasm, successfully widening the genetic basis of high-oil corn, and solving long-term problems that have plagued high oil corn in the world. A major technical problem with a narrow germplasm base and a lack of genetic diversity. This achievement was recently awarded the first prize of the 2007 Yunnan Province Science and Technology Award for Technology and Invention.
It is reported that the study of high-oil corn was first started in the University of Illinois in the United States. After more than 100 years of breeding, it was an important subject in the genetics and breeding discipline of corn. However, the high-oil corn has a major problem of narrow genetic base of germplasm. China began researching high-oil corn in the 1980s and selected a number of high-oil maize varieties. However, the high-oil maize germplasm selected in China was temperate germplasm, and the high-oil corn varieties selected were generally poor in resistance. Problems such as low production volume and promotion of production are small.
The research group led by Fan Xingming uses molecular biology (SSR markers) in combination with conventional breeding, and combines the analysis of combining ability, genetic diversity, and the classification of heterotic groups, and has been applied to breeding practices for the first time at home and abroad. Tropical high oil corn Yun Rui 21. According to the testing of the Grain Quality Supervision, Inspection and Testing Center of the Ministry of Agriculture, the whole grain crude fat is 6.06%, crude starch is 72.25%, crude protein is 7.66%, and lysine is 0.31%. It is the only high-oil corn variety that meets the high starch standard at home and abroad. . At the same time, as identified by the Crop Science Research Institute of the Chinese Academy of Agricultural Sciences, this strain is resistant to major maize diseases such as corn leaf spot, gray leaf spot, head smut, ear rot, and dwarf mosaic disease, and is currently a prominent disease resistance in China. The high oil white corn varieties, and in 2007 won the national new plant varieties and protected varieties rights.
At present, the variety has been cumulatively promoted in Yunnan Province by 1,818,200 mu, adding 118,800 tons of corn, and an average yield of 58,6.1 kg per mu. This effectively solved the current low domestic production of high-oil corn, and the direct and indirect new production value reached 480 million yuan. . At the same time, experiments in Yunnan Province have shown that pigs fed with Yunyou 21 as the main feed have an average efficiency increase of 33.55% compared with ordinary corn feed, which promotes the development of related industries such as animal husbandry and improves the people in poverty-stricken areas. The nutritional and dietary structure and the economic and social benefits of addressing people’s nutritional problems in corn-based food areas are significant.
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