Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 64, Issue 35, Pages 6685-6693Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.6b02044
Keywords
Theaceae; disease resistance; tea polyphenols; catechins; Colletotrichum
Funding
- Earmarked Fund for China Agriculture Research System [CARS-23]
- Chinese Academy of Agricultural Sciences through an Innovation Project for Agricultural Sciences and Technology [CAAS-ASTIP-2014-TRICAAS]
- Major Project for New Agricultural Varieties Breeding of Zhejiang Province [2012C2905-3]
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Tea plant (Camellia sinensis) is one of the most economically valuable crops in the world. Anthracnose can affect the growth of leaves and cause serious yield losses of tea. Tea plants are rich in secondary metabolites; however, their roles in resistance to anthracnose are unclear. Herein we compared the contents of total phenolics, catechins, and caffeine in two cultivars with different resistances to anthracnose during Colletotrichum fructicola infection. (-)-Epigallocatechin-3-gallate (EGCG), (+)-catechin (C), caffeine, and critical regulatory genes were induced in C. fructicola-resistant tissues. In vitro antifungal tests showed that caffeine more strongly inhibited mycelial growth than tea polyphenols and catechins. Both electron microscopy and bioactivity analysis results showed that caffeine can affect mycelial cell walls and plasma membranes. Through promoter sequences analysis, a number of stress response-related cis-acting elements were identified in S-adenosylmethionine synthetase and tea caffeine synthase. These results demonstrated that ()-EGCG, (+)-C, and caffeine may be involved in the resistance of tea plants to anthracnose.
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