Novel insight into theacrine metabolism revealed by transcriptome analysis in bitter tea (Kucha, Camellia sinensis)

文献类型： 外文期刊

第一作者： Wang, Songlin

作者： Wang, Songlin;Chen, Jiedan;Ma, Jianqiang;Jin, Jiqiang;Chen, Liang;Yao, Mingzhe

作者机构：

期刊名称：SCIENTIFIC REPORTS （ 影响因子：4.379； 五年影响因子：5.133 ）

ISSN： 2045-2322

年卷期： 2020 年 10 卷 1 期

页码：

收录情况： SCI

摘要： Kucha (Camellia sinensis) is a kind of unique wild tea resources in southwest China, containing sizeable amounts of theacrine (1,3,7,9-tetramethyluric acid) and having a special bitter taste both in fresh leaves and made tea. Theacrine has good healthy function locally. But the molecular mechanism of theacrine metabolism in Kucha was still unclear. In order to illuminate the biosynthesis and catabolism of theacrine in Kucha plants, three tea cultivars, C. sinensis 'Shangyou Zhongye' (SY) with low-theacrine, 'Niedu Kucha 2' (ND2) with middle-theacrine and, 'Niedu Kucha 3' (ND3) with high-theacrine, were used for our research. Purine alkaloid analysis and transcriptome of those samples were performed by High Performance Liquid Chromatography (HPLC) and RNA-Seq, respectively. The related gene expression levels of purine alkaloid were correlated with the content of purine alkaloid, and the results of quantitative real-time (qRT) PCR were also confirmed the reliability of transcriptome. Based on the data, we found that theacrine biosynthesis is a relatively complex process, N-methyltransferase (NMT) encoded by TEA024443 may catalyze the methylation at 9-N position in Kucha plant. Our finding will assist to reveal the molecular mechanism of theacrine biosynthesis, and be applied to selection and breeding of Kucha tea cultivars in the future.

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