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- Title
Effects of Long-Term Nitrogen Fertilization on the Formation of Metabolites Related to Tea Quality in Subtropical China.
- Authors
Chen, Yuzhen; Wang, Feng; Wu, Zhidan; Jiang, Fuying; Yu, Wenquan; Yang, Jie; Chen, Jiaming; Jian, Guotai; You, Zhiming; Zeng, Lanting; Hall, Robert D
- Abstract
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/hm2) 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.
- Subjects
CHINA; TEA; BENZYL alcohol; METABOLITES; TEA growing; CATECHIN; NITROGEN; EPIGALLOCATECHIN gallate; REACTIVE nitrogen species
- Publication
Metabolites (2218-1989), 2021, Vol 11, Issue 3, p146
- ISSN
2218-1989
- Publication type
Article
- DOI
10.3390/metabo11030146