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Relationship between theanine, catechins and related genes reveals accumulation mechanism during spring and summer in tea plant (Camellia sinensis L.)

文献类型： 外文期刊

作者： Huang, Fangfang 1 ; Li, Ying 1 ; Yang, Peidi 3 ; Liu, Zhong hua 1 ; Huang, Jian 'an 1 ; Xiong, Ligui 1 ; Li, Juan 1 ;

作者机构： 1.Hunan Agr Univ, Key Lab Tea Sci, Minist Educ, Changsha 410128, Peoples R China

2.Hunan Agr Univ, Natl Res Ctr Engn & Technol Utilizat Bot Funct Ing, Changsha 410128, Peoples R China

3.Hunan Acad Agr Sci, Tea Res Inst, Changsha 410125, Peoples R China

4.Hunan Co Innovat Ctr Educ Minist Utilizat Bot Func, Changsha 410128, Peoples R China

关键词： Tea plant; Theanine; Catechins; Gene expression; Correlation analysis

期刊名称：SCIENTIA HORTICULTURAE （ 影响因子：4.342； 五年影响因子：4.342 ）

ISSN： 0304-4238

年卷期： 2022 年 302 卷

页码：

收录情况： SCI

摘要： The tea plant (Camellia sinensis L.) is an important commercial crop. Theanine and catechins, abundant in the tea plant and represented as secondary metabolites of the tea plant, contribute to the refreshing and astringent taste of tea, respectively. In this study, three C. sinensis cultivars, 'Baojing Huangjincha 1 & PRIME; (HJC1), 'Huangjincha 2 & PRIME; (HJC2), and 'Huangjincha 168 & PRIME; (HJC168) harvested in spring and summer were used to investigate differences in theanine and catechin concentrations by high-performance liquid chromatography. The expression levels of genes associated with theanine and catechin biosynthesis were investigated using a real-time quantitative polymerase chain reaction. Results indicated that theanine, aspartic acid, serine, glutamate and alanine contents were higher in spring in three cultivars, while CsGDH1 showed higher expression in summer. As for catechins, HJC1 and HJC2 accumulated more epigallocatechin gallate (EGCG) and epicatechin gallate (ECG) contents in summer. On the contrary, HJC168 showed higher EGCG and ECG contents in spring. CsF3H showed higher expression in spring than in summer in three cultivars. Correlation analysis indicated a positive correlation between the CsGABA-T expression and theanine contents in spring and summer (p < 0.05), with the activity of GABA-T in theanine synthesis, implying that CsGABA-T might be a crucial positive regulator in theanine accumulation. Besides, most catechin compounds were positively correlated with related genes expression during summer. It was presumed that catechin synthesis contributes to catechin accumulation in summer. In summary, this study provides insights into the potential regulatory mechanisms of theanine and catechins in spring and summer.

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