HIGHLIGHTS
SUMMARY
Metabolites of polyphenols, alkaloids, theanine, tea saponin, and tea polysaccharides are rich in tea, and they have nutrients and functions in healthcare (Yang et_al, 1999; Zheng et_al, 2011). Previous research has shown that tea plants contain many metabolites with obvious antibacterial properties, such as tea polyphenols and alkaloids (Karou et_al, 2006; Ma et_al, 2020). Secondary metabolites can be used as biochemical barriers to resist pathogen invasion and can also be used as signal substances to participate in the transduction of plant-disease resistance response (Escobedo-MartÃnez et_al, 2010; El-Hadidy and El-Ati . . .

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