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August 19, 2016Journal of Agricultural and Food Chemistry

Metabolic Changes of Caffeine in Tea Plant (Camellia sinensis (L.) O. Kuntze) as Defense Response to Colletotrichum fructicola

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Authors

YWYuchun WangWQWenjun QianNLNana Li

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Overview

Comparative biochemical analysis reveals antifungal caffeine accumulation in tea plants during fungal infection, highlighting its protective role against anthracnose.

Key Points

  • To investigate the metabolic changes and defensive functions of caffeine and related secondary metabolites in tea plants responding to Colletotrichum fructicola infection.
  • Quantified total phenolics, catechins, and caffeine across resistant and susceptible Camellia sinensis cultivars during Colletotrichum fructicola infection.
  • Conducted in vitro bioactivity assays and electron microscopy to evaluate the inhibitory effects of caffeine on fungal mycelial growth and membrane integrity.
  • Profiled promoter sequences of S-adenosylmethionine synthetase and tea caffeine synthase to detect stress-responsive cis-acting regulatory elements.
  • (-)-Epigallocatechin-3-gallate, (+)-catechin, caffeine, and their key biosynthetic genes were induced in resistant tea tissues following fungal exposure.
  • Caffeine inhibited Colletotrichum fructicola mycelial growth more strongly than catechins or polyphenols, directly damaging fungal cell walls and plasma membranes.
  • Multiple stress response-related cis-acting elements were identified in the promoters of tea caffeine synthase and S-adenosylmethionine synthetase.

Cite This Study

Wang et al. (2016) studied this question.

synapsesocial.com/papers/69f41cb5fbc6a3062ad40074https://doi.org/10.1021/acs.jafc.6b02044
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Also Consider

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