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    Home > Food News > Food Articles > The whole genome of Chinese tea trees was decrypted

    The whole genome of Chinese tea trees was decrypted

    • Last Update: 2021-03-09
    • Source: Internet
    • Author: User
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    The research team of Professor Wan Xiaochun of Anhui Agricultural University's National Key Laboratory for Tea Tree Biology and Resource Utilization (Anhui Province Laboratory), in cooperation with the research team of Shenzhen Huada Gene and the National Genetic Research Center of the Chinese Academy of Sciences (Shanghai), has cracked the whole genome information of the world's most widely distributed Tea Tree in China, the results of which were published online on April 21 at
    .
    The world's main tea tree belongs to two variants: the Chinese species and the Assam species, the former small leaves, widely distributed, suitable green tea and other six tea species; The research team sequenced the national tea tree variety Shu tea early (Chinese species), sequenced it with second- and third-generation sequencing techniques, adopted a hybrid assembly strategy, obtained high-quality sequence sketches covering 93% of the genome, and annotated 33,932 high-confidence tea tree genes.
    results show that the size of the Chinese genome is 3.1Gb, the content of repeated sequence is 64%, the integrity and quality of genome assembly is much higher than the existing similar sequenced species assembly level. The study found that the tea tree ancestor species differentiated from the closest kiwi species to kinship about 80 million years ago, and then between 1.54 and 380,000 years ago, the Chinese and Assam species were differentiated.
    study found that there were two genome-wide replication events in the tea tree genome, the most recent between 40 and 30 million years ago, which and subsequent series replication led to a significant increase in the number of copies of genes associated with the biosynthetics of caffeine-like substances and caffeine. The biosynthetics of urinals are regulated by complex transcription, and many transcription factors associated with biological and non-biological adversity are highly related to the levels of utin. The study found a key enzyme gene (CsTSI) involved in the synthesis of theanine, and by transcriptional histology and genetically modified analysis, it was proved that CSTSI had the enzyme activity of synthetic theanine. Comparative genomic analysis found that the number of synthase gene copies of substances such as terpenes also increased significantly in the tea tree genome, helping to explain the unique aroma of tea. These findings are the first to solve the mystery of the unique flavor-rich substances found in tea leaves at the genomic level. (Source: China Science Journal reporter Yang Baoguo, Zhu Hanbin Correspondent Wu Dandan, Cao Lei)
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