Differential accumulation of specialized metabolite L-theanine in green and albino-induced yellow tea (Camellia sinensis) leaves

被引：78

作者：

Cheng, Sihua ^{[1
,2
,3
]}

Fu, Xiumin ^{[1
,2
]}

Liao, Yinyin ^{[1
,2
,3
]}

Xu, Xinlan ^{[1
,2
]}

Zeng, Lanting ^{[1
,2
,3
]}

Tang, Jinchi ^{[4
,5
]}

Li, Jianlong ^{[4
,5
]}

Lai, Jianhong ^{[6
]}

Yang, Ziyin ^{[1
,2
,3
]}

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

来源：

FOOD CHEMISTRY | 2019年 / 276卷

关键词：

Albino; Amino acid; Camellia sinensis; Hydrolase; Tea; Theanine; CHLOROPLAST PROTEINS; MUTANT; CHLOROPHYLLS; ARABIDOPSIS; TEMPERATURE; EXPRESSION; PATHWAY; ENZYME; ACID;

D O I：

10.1016/j.foodchem.2018.10.010

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

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.

引用

页码：93 / 100

页数：8