Graduate School of Life and Environmental Sciences, Kyoto Prefectural University, Kyoto, Japan.
Biotechnology Research Department, Kyoto Prefectural Agriculture, Forestry and Fisheries Technology Center, Seika, Kyoto, Japan.
Biosci Biotechnol Biochem. 2022 Oct 20;86(11):1515-1523. doi: 10.1093/bbb/zbac154.
Shade cultivation of tea plants (Camellia sinensis L.) is employed for the production of high-quality green tea which increases the content of chlorophylls and free amino acids, including theanine. However, shaded tea plants suffer from photooxidative stress caused by sudden exposure to high light (HL) when the shade is removed. In this study, we tried to acclimatize shaded tea plants to light prior to shade removal to alleviate HL-induced stress. Acclimated tea plants showed milder photoinhibition in response to HL exposure than the shaded plants without acclimation. Moreover, there were no large differences in the total chlorophylls and free amino acids (including theanine) content between acclimated and non-acclimated plants. These results indicate that acclimation of shaded tea plants can alleviate subsequent HL stress without causing large changes in the content of chemical components associated with tea quality.
茶树遮荫栽培用于生产高品质绿茶，增加叶绿素和游离氨基酸含量，包括茶氨酸。然而，当遮荫去除时，遮荫茶树会因突然暴露在高光下而遭受光氧化胁迫。在这项研究中，我们试图在去除遮荫之前使遮荫茶树适应光照，以减轻高光诱导的胁迫。与未经驯化的遮荫茶树相比，驯化后的茶树在暴露于高光下时表现出较轻的光抑制。此外，驯化和未驯化的茶树之间的总叶绿素和游离氨基酸（包括茶氨酸）含量没有大的差异。这些结果表明，遮荫茶树的驯化可以减轻随后的高光胁迫，而不会导致与茶叶品质相关的化学成分含量发生大的变化。
