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Secondary metabolites of tea leaves and their role in protecting against environmental stressors
https://doi.org/10.31676/0235-2591-2020-4-12-17
Abstract
The dynamics of a number of secondary metabolites and the activity of guaiacol peroxidase in 3-leaf sprout of tea varieties and forms were studied. In the course of 3-year research we noted the presence of declines and peaks in the activity of the enzyme and the accumulation of flavonoids, carotenoids, caffeine and amino acids associated with the meteorological conditions of each month. It is shown that there is a close inverse relationship between increased enzyme activity, carotenoid content and hydrothermal factors. The most significant correlation was found between the activity of guaiacol peroxidase and carotenoids in a 3-leaf tea flush with precipitation (r = -0.86 and -0.68). At the beginning of vegetation the enzyme activity is low (ranging from 0.363 to 0.607 units/g·s). The decrease in the activity of guaiacol peroxidase in June is due to the biological peculiarities of the tea culture associated with a period of rest, during which the metabolic processes are somewhat slowed down. Increased activity of guaiacol peroxidase is accompanied by rapid synthesis of phenolic compounds, such as flavonoids. We have traced the dynamics of the formation of thearubigins and theaflavins in tea sprout. It is shown that their amount varies depending on the season of collection from 0.075 mg/g (theaflavins) and 1.178 mg/g (thearubigins) to 0.115 mg/g and 1.625 mg/g (theaflavins and thearubigins, respectively) and their dynamics is similar. The content of the routine varies depending on the season of tea leaf collection. The synthesis of caffeine also depends on the growing conditions, the active accumulation of which in experimental plants was observed in July (on average 26.6±1.4 mg/g). The largest amount of amino acids (16 665 mg/g) is synthesized in May, and then their synthesis is halved. Genotypic peculiarities are manifested in the content of secondary metabolites and the activity of guaiacol peroxidase. The revealed patterns are common for all varieties and forms of tea.
Keywords
tea,
guaiacol peroxidase,
ruthin,
caffeine,
flavonoids,
carotenoids,
air temperature,
precipitation,
correlation,
resistance
About the Authors
N. B. Platonova
Federal Research Center “Subtropical Scientifi c Center of the Russian Academy of Sciences”
Russian Federation
Russian Federation
Junior Researcher, Laboratory of Plant Physiology and Biochemistry, Sochi, Russia
O. G. Belous
Federal Research Center “Subtropical Scientifi c Center of the Russian Academy of Sciences”
Russian Federation
Russian Federation
Oksana G.Belous, Dr. Sci. (Biol.), Chief Researcher, Laboratory of Plant Physiology and Biochemistry, 2/28, Yana Fabritsiusa str., Sochi, 354002, Russia
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Review
For citations:
Platonova N.B., Belous O.G. Secondary metabolites of tea leaves and their role in protecting against environmental stressors. Horticulture and viticulture. 2020;(4):12-17. (In Russ.) https://doi.org/10.31676/0235-2591-2020-4-12-17
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