Document Detail

Changes in the levels of polymethoxyflavones and flavanones as part of the defense mechanism of Citrus sinensis (cv. Valencia Late) fruits against Phytophthora citrophthora.
MedLine Citation:
PMID:  15053528     Owner:  NLM     Status:  MEDLINE    
Phytophthora citrophthora causes serious losses in Citrus fruits through brown rot lesion. The effect of infection with P. citrophthora on Citrus sinensis (cv. Valencia Late) fruits was studied, with particular reference to the levels of the flavanones hesperidin and isonaringin and the polymethoxyflavones sinensetin, nobiletin, tangeretin, and heptamethoxyflavone, because flavonoids are most probably involved as natural defense or resistance mechanisms in this genus. Changes in the levels of these flavonoids were detected after infection. The hesperidin and isonaringin contents fell by 13 and 67%, respectively, whereas the contents of their corresponding aglycons, hesperetin and naringenin, increased, suggesting the hydrolyzing effect of this fungus on the glycosylated flavanones. The heptamethoxyflavone, nobiletin, sinensetin, and tangeretin levels increased by 48, 28, 26, and 24%, respectively. The in vitro study revealed that these compounds acted as antifungal agents, the most active being the aglycons (naringenin and hesperetin), followed by the polymethoxyflavones and flavanone glycosides. The participation of these flavonoids in the defense mechanism of this Citrus species is discussed.
J A del Río; P Gómez; A G Baidez; M C Arcas; J M Botía; A Ortuño
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  52     ISSN:  0021-8561     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2004 Apr 
Date Detail:
Created Date:  2004-03-31     Completed Date:  2004-05-07     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1913-7     Citation Subset:  IM    
Plant Biology Department, Faculty of Biology, University of Murcia, 30100 Espinardo, Murcia, Spain.
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MeSH Terms
Citrus sinensis / chemistry*
Flavanones / analysis*
Flavonoids / analysis*
Fruit / chemistry*
Fungicides, Industrial
Hesperidin / analysis
Phytophthora* / drug effects,  metabolism,  ultrastructure
Plant Diseases / microbiology*
Reg. No./Substance:
0/Flavanones; 0/Flavonoids; 0/Fungicides, Industrial; 10236-47-2/naringin; 520-26-3/Hesperidin; 520-33-2/hesperetin

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