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Variation in flavonoid levels in Citrus benikoji Hort. ex. Tan. infected by Colletotrichum gloeosporioides.

Abstract
Anthracnose caused by Colletotrichum gloeosporioides is one of the most serious postharvest diseases of citrus fruit. Fruit peels infected with C. gloeosporioides and the peels of healthy fruit were analysed for flavonoids, using high performance liquid chromatography-tandem mass spectroscopy, to evaluate variations in flavonoid levels in Citrus benikoji Hort. ex. Tan. Seventeen flavonoids were characterised from the fruit peels. The flavonoids were validated using structurally related standards and quantified. Among the 17 flavonoids, the concentration of component 3 was the highest and that of component 10 was the lowest. During 8 days after inoculation, the concentration of the seven flavonoids 1-3, 5, 6, 13, and 14 increased gradually up to day 8. Flavonoid 4 was detected from day 7. The seven minor flavonoid components, 8-12, 15, and 16 increased to day 5 and then decreased. However, flavonoids level variations were not significantly different from that of the non-infected fruits during the experimental period. The monitoring suggested that the constitutively formed seven polymethoxyflavones (8-12, 15, and 16) may act as phytoanticipins in the defence mechanism against the fungus, and that hespertin 7-O-glucoside (4), produced de novo on day 6 after infection, may function as a phytoalexin.
AuthorsSung Woo Jeong, Hae Gyeong Kim, Semin Park, Jung Han Lee, Yun-Hi Kim, Gon-Sup Kim, Jong Sung Jin, Youn-Sig Kwak, Moo Ryong Huh, Ji Eun Lee, Yi Song, Sung Chul Shin
JournalFood chemistry (Food Chem) Vol. 148 Pg. 284-8 (Apr 01 2014) ISSN: 1873-7072 [Electronic] England
PMID24262558 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
CopyrightCopyright © 2013 Elsevier Ltd. All rights reserved.
Chemical References
  • Flavonoids
  • Plant Extracts
Topics
  • Citrus (chemistry, metabolism, microbiology)
  • Colletotrichum (physiology)
  • Flavonoids (analysis, metabolism)
  • Fruit (chemistry, metabolism, microbiology)
  • Plant Diseases (microbiology)
  • Plant Extracts (analysis, metabolism)

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