Mei Xin, Liu Xiaoyu, Zhou Ying, Wang Xiaoqin, Zeng Lanting, Fu Xiumin, Li Jianlong, Tang Jinchi, Dong Fang, Yang Ziyin
Guangdong Provincial Key Laboratory of Applied Botany & Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, South China Botanical Garden, Chinese Academy of Sciences, Xingke Road 723, Tianhe District, Guangzhou 510650, China.
Guangdong Provincial Key Laboratory of Applied Botany & Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement, South China Botanical Garden, Chinese Academy of Sciences, Xingke Road 723, Tianhe District, Guangzhou 510650, China; University of Chinese Academy of Sciences, No.19A Yuquan Road, Beijing 100049, China.
Food Chem. 2017 Dec 15;237:356-363. doi: 10.1016/j.foodchem.2017.05.124. Epub 2017 May 25.
Famous oolong tea (Oriental Beauty), which is manufactured by tea leaves (Camellia sinensis) infected with tea green leafhoppers, contains characteristic volatile monoterpenes derived from linalool. This study aimed to determine the formation mechanism of linalool in tea exposed to tea green leafhopper attack. The tea green leafhopper responsible for inducing the production of characteristic volatiles was identified as Empoasca (Matsumurasca) onukii Matsuda. E. (M.) onukii attack significantly induced the emission of linalool from tea leaves (p<0.05) as a result of the up-regulation of the linalool synthases (CsLIS1 and CsLIS2) (p<0.05). Continuous mechanical damage significantly enhanced CsLIS1 and CsLIS2 expression levels and linalool emission (p<0.05). Therefore, continuous wounding was a key factor causing the formation and emission of linalool from tea leaves exposed to E. (M.) onukii attack. This information should prove helpful for the future use of stress responses of plant secondary metabolism to improve quality components of agricultural products.
著名的乌龙茶（东方美人）由受茶小绿叶蝉感染的茶叶（茶树）制成，含有源自芳樟醇的特征性挥发性单萜。本研究旨在确定受茶小绿叶蝉侵害的茶叶中芳樟醇的形成机制。被确定为负责诱导特征性挥发物产生的茶小绿叶蝉为假眼小绿叶蝉。假眼小绿叶蝉的侵害由于芳樟醇合酶（CsLIS1和CsLIS2）的上调（p<0.05）而显著诱导茶叶中芳樟醇的释放（p<0.05）。持续的机械损伤显著提高了CsLIS1和CsLIS2的表达水平以及芳樟醇的释放（p<0.05）。因此，持续的伤口是导致受假眼小绿叶蝉侵害的茶叶中芳樟醇形成和释放的关键因素。这些信息对于未来利用植物次生代谢的应激反应来改善农产品的品质成分应具有帮助作用。
