Differential accumulation of specialized metabolite L-theanine in green and albino-induced yellow tea (Camellia sinensis) leaves
文献类型： 外文期刊
作者： Cheng, Sihua 1 ; Fu, Xiumin 1 ; Liao, Yinyin 1 ; Xu, Xinlan 1 ; Zeng, Lanting 1 ; Tang, Jinchi 4 ; Li, Jianlong 4 ; Lai, 1 ;
作者机构： 1.Chinese Acad Sci, South China Bot Garden, Key Lab South China Agr Plant Mol Anal & Genet Im, Xingke Rd 723, Guangzhou 510650, Guangdong, Peoples R China
2.Chinese Acad Sci, South China Bot Garden, Guangdong Prov Key Lab Appl Bot, Xingke Rd 723, Guangzhou 510650, Guangdong, Peoples R China
3.Univ Chinese Acad Sci, 19A Yuquan Roacl, Beijing 100049, Peoples R China
4.Guangdong Acad Agr Sci, Tea Res Inst, Dafeng Rd 6, Guangzhou 510640, Guangdong, Peoples R China
5.Guangdong Prov Key Lab Tea Plant Resources Innova, Dafeng Rd 6, Guangzhou 510640, Guangdong, Peoples R China
6.Anji Agr Bur, Econ Crop Stn, Lingzhi West Rd 1, Huzhou 313399, Peoples R China
关键词： Albino; Amino acid; Camellia sinensis; Hydrolase; Tea; Theanine
期刊名称：FOOD CHEMISTRY （ 影响因子：7.514； 五年影响因子：7.516 ）
ISSN： 0308-8146
年卷期： 2019 年 276 卷
页码：
收录情况： SCI
摘要： L-Theanine is a specialized metabolite in tea (Camellia sinensis) leaves that contributes to tea function and quality. Yellow tea leaves (albino) generally have higher L-theanine contents than green tea leaves (normal), but the reason is unknown. The objective of this study was to investigate why L-theanine is accumulated in yellow tea leaves. We compared original normal leaves (green) and light-sensitive albino leaves (yellow) of cv. Yinghong No. 9. The L-theanine content was significantly higher in yellow leaves than in green leaves (p <= 0.01). After supplementation with [H-2(5)]-L-theanine, yellow leaves catabolized less [H-2(5)]-L-theanine than green leaves (p <= 0.05). Furthermore, most plants contained the enzyme catalyzing L-theanine conversion to ethylamine and L-glutamic acid. In conclusion, L-theanine accumulation in albino-induced yellow tea leaves was due to weak L-theanine catabolism. The differential accumulation mechanism differed from the L-theanine accumulation mechanism in tea and other plants.
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