Effects of Long-Term Nitrogen Fertilization on the Formation of Metabolites Related to Tea Quality in Subtropical China

文献类型： 外文期刊

第一作者： Chen, Yuzhen

作者： Chen, Yuzhen;Wang, Feng;Wu, Zhidan;Jiang, Fuying;You, Zhiming;Chen, Yuzhen;Wang, Feng;Wu, Zhidan;Jiang, Fuying;You, Zhiming;Yu, Wenquan;Yang, Jie;Chen, Jiaming;Jian, Guotai;Zeng, Lanting;Yang, Jie;Chen, Jiaming;Jian, Guotai;Zeng, Lanting

作者机构：

关键词： long-term nitrogen fertilization; Camellia sinensis; tea quality; chlorophyll; catechin; L-theanine; aroma compound

期刊名称：METABOLITES （ 影响因子：4.097； ）

ISSN：

年卷期： 2021 年 11 卷 3 期

页码：

收录情况： SCI

摘要： As a main agronomic intervention in tea cultivation, nitrogen (N) application is useful to improve tea yield and quality. However, the effects of N application on the formation of tea quality-related metabolites have not been fully studied, especially in long-term field trials. In this study, a 10-year field experiment was conducted to investigate the effect of long-term N application treatments on tea quality-related metabolites, their precursors, and related gene expression. Long-term N application up-regulated the expression of key genes for chlorophyll synthesis and promoted its synthesis, thus increasing tea yield. It also significantly increased the contents of total free amino acids, especially L-theanine, in fresh tea leaves, while decreasing the catechin content, which is conducive to enhancing tea liquor freshness. However, long-term N application significantly reduced the contents of benzyl alcohol and 2-phenylethanol in fresh tea leaves, and also reduced (E)-nerolidol and indole in withered leaves, which were not conducive to the formation of floral and fruity aroma compounds. In general, an appropriate amount of N fertilizer (225 kg/hm(2)) balanced tea yield and quality. These results not only provide essential information on how N application affects tea quality, but also provide detailed experimental data for field fertilization.

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