Effect of selenium on tea (Camellia sinensis) under low temperature: Changes in physiological and biochemical responses and quality

• Published in: Environmental and experimental botany 2021-08, Vol.188, p.104475, Article 104475
• Main Authors: Liu, Kehong, Li, Siying, Han, Jingdong, Zeng, Xiaoyan, Ling, Menglin, Mao, Junling, Li, Yeyun, Jiang, Jiayue
• Format: Article
• Language: English
• Subjects: Low temperature; Metabolite; Selenium; Tea
• ISSN: 0098-8472; 1873-7307
• DOI: 10.1016/j.envexpbot.2021.104475

[Display omitted] •Selenium improves the cold tolerance of tea by stabilizing the photosynthesis and membrane system of plants.•Selenium increased the activities of SOD, POD, CAT and APX to cope with oxidative damage in tea plants caused by cold stress.•We firstly provide metabolic insights into selenium-mediated low temperature stress in tea plant.•Selenium improves the quality of tea by reducing the oxidation of polyphenols and increasing the content of soluble sugars and amino acids. Tea is a high-value cash crop, and it is a popular beverage globally owing to its unique flavor and health benefits. Selenium can increase tea yield, and the increasing demand for selenium-enriched tea has made it a research hotspot. However, the effect of selenium on the quality and cold resistance of tea has rarely been studied. The purpose of this study was to examine the effects of exogenous selenium application on the physiological and biochemical properties, antioxidant enzyme activity, and quality of tea under low-temperature stress (4℃). The results showed that selenium treatment increased the net photosynthetic rate of leaves under low-temperature stress. Furthermore, it reduced the contents of malondialdehyde and hydrogen peroxide to stabilize plant photosynthesis and the membrane system and to improve the cold tolerance of tea.Moreover, selenium treatment regulates the content of proline and increases the activities of superoxide dismutase, ascorbate peroxidase, peroxidase and catalase to prevent oxidative damage caused by cold stress. In addition, treatment with selenium regulated changes in the secondary metabolites of tea under low-temperature stress, including reducing the oxidation products of polyphenols, increasing the polyphenol content, increasing sugar accumulation, and promoting the synthesis of various tea amino acids to improve tea quality.