A study led by the Tea Research Institute of the Chinese Academy of Agricultural Sciences and the Shenzhen Agricultural Genome Research Institute of the Chinese Academy of Agricultural Sciences depicts the evolutionary history of cultivated tea plants. The research results provide rich materials for tea genomics and breeding research, as well as tea genetics and evolution research. Tea is a worldwide beverage. Tea originated in China, widely distributed in China, rich in germplasm resources. Six major types of tea, including black tea, green tea, oolong tea, yellow tea, black tea and white tea, have their own characteristics, but there is little research on the evolution of tea plants. < p > < p > the researchers first took the famous Chinese tea variety “Longjing 43” as material to overcome the problems of high heterozygosity and high proportion of repetitive sequences, and completed the genome assembly of “Longjing 43” at chromosome level. On this basis, the researchers found the gene “code” that determines the excellent economic traits of “Longjing 43”, such as early germination, high yield and strong stress resistance. According to Yang Yajun, a researcher at the Tea Research Institute of the Chinese Academy of Agricultural Sciences, this year coincides with the 60th anniversary of the breeding of Longjing 43, a tea variety with the highest promotion area in China’s main green tea production area. The research results explain the molecular nature of “Longjing 43” with excellent quality and strong stress resistance, which has important commemorative significance. Based on the high-quality genome assembled from “Longjing 43”, the researchers analyzed the genomic variation of 139 representative tea plant materials from different countries and regions in the world, revealed the phylogenetic relationship of tea plant population and described the evolution history of cultivated tea tree. In this study, it was found that the wild related populations of tea plants were the ancestors of the cultivated small and medium leaf tea varieties (most of them belonged to tea varieties in plant classification) and large leaf tea varieties (mostly belonged to Assam tea varieties in plant classification), and there were differences in the selection direction between the two varieties in the process of domestication. The higher expression of terpene metabolism genes in the buds and leaves of small and medium-sized tea plants in China means that their flavor characteristics are more obvious and richer. < / P > < p > the research results were published online on September 7 in the international well-known academic journal Nature communication. The research participants include Kunming Institute of zoology, Chinese Academy of Sciences and Tea Research Institute of Yunnan Academy of Agricultural Sciences. Chinese version of K-car: reading a10e design drawing exposure