Huang Shan, Zuo Ting, Xu Wanfu, Zhang Yaxiong, Ni Wuzhong
Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
Zhejiang Anji Summit Angeltea Co., Ltd., Anji, Zhejiang313300, China.
J Agric Food Chem. 2021 Feb 3;69(4):1242-1250. doi: 10.1021/acs.jafc.0c06284. Epub 2021 Jan 20.
White leaf No.1 (WL-1) is a low temperature-induced albino tea cultivar, which sticks out from tea plants with rich amino acids. Because harmonization of chloroplast ultrastructure integrity and lower chlorophyll contents during the albinism processes is much crucial for WL-1 production under extreme weather conditions, we carried out a field experiment to investigate the regulating effects of exogenous glycinebetaine (GB) on the chloroplast ultrastructure and quality constituents in young leaves of WL-1 at different albinism stages. The internal structure of chloroplasts degenerated at the albinistic stage, and chlorophyll contents were significantly lower than those at pre-albinistic and regreening stages. Spraying GB regulated etioplast-chloroplast transition, significantly increased epigallocatechin gallate, theanine, and caffeine contents, and lowered chlorophyll content in albinistic young leaves of WL-1, thus improving its quality in some aspects, maintaining special leaf color, exerting flavor and umami, and improving antioxidant and refreshing effects. Foliar application of GB is an efficient technical measure in practice.
白叶 1 号（WL-1）是一种低温诱导的白化茶品种，其氨基酸含量丰富，在茶树中较为突出。由于在极端天气条件下，白化过程中叶绿体超微结构完整性的协调和较低的叶绿素含量对 WL-1 的生产至关重要，我们进行了一项田间试验，以研究外源甘氨酸甜菜碱（GB）对 WL-1 不同白化阶段幼叶叶绿体超微结构和品质成分的调节作用。叶绿体的内部结构在白化阶段退化，叶绿素含量显著低于白化前和返绿阶段。喷施 GB 调节了黄化质体 - 叶绿体的转变，显著提高了表没食子儿茶素没食子酸酯、茶氨酸和咖啡因的含量，并降低了 WL-1 白化幼叶中的叶绿素含量，从而在某些方面提高了其品质，保持了特殊的叶色，发挥了风味和鲜味，并提高了抗氧化和提神效果。叶面喷施 GB 是一种有效的实际技术措施。
