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UV-B protective potential and flavonoid content of leaf hairs of Quercus ilex

TitleUV-B protective potential and flavonoid content of leaf hairs of Quercus ilex
Publication TypeJournal Article
Year of Publication1994
AuthorsSkaltsa, H., Verykokidou E., Harvala C., Karabourniotis G., & Manetasi Y.
JournalPhytochemistry
Volume37
Pagination987-990
KeywordsFagaceae, flavonoids, Holly Oak, leaf hairs, Quercus ilex, UV-B damage
Abstract

Flavonoids of non-glandular leaf hairs from Quercus ilex were analysed. The main compounds were acylated kaempferol glycosides. Acylation shifted the absorption peak into the ultraviolet-B region of the spectrum in which intact trichome layers absorbed strongly. Ultraviolet-B radiation caused a considerable reduction of photosystem II photochemical efficiency only in dehaired leaves. It is suggested that leaf hairs, besides other roles, may function as an effective filter against the harmful ultraviolet-B radiation.