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Abstract

Degenia velebitica (Degen) Hayek, the most important representative of the Croatian endemic flora, is a heliophyte and xerophyte highly specialized for survival in extreme living conditions characterised by intense solar radiation. In this work, the composition and in situ localization of flavonoids in the epidermal trichomes and leaf tissues of D. velebitica were investigated. Flavonoids were localized in the lumens of stellate trichomes, vacuoles and cell walls of epidermal cells, but only in peripheral parts of spongy and palisade parenchyma cells, on both the abaxial and adaxial sides of the leaf. Quercetin, kaempferol and isorhamnetin were the main flavonoid aglycones in extracts of trichomes and leaves. The results show the important physiological role of epidermal trichomes and flavonoids in protecting D. velebitica against insolation.

Keywords

fluorescence microscopy isorhamnetin kaempferol quercetin stellate trichomes UV protection xeromorphysm

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Copyright (c) 2025 Vanja Stamenković, Mirta Tkalec

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How to Cite
Stamenković, V., & Tkalec, M. (2025). Flavonoid composition and localization in trichomes and leaves of Degenia velebitica (Brassicaceae). Acta Botanica Croatica, 84(2), 247–255. https://doi.org/10.37427/botcro-2025-029
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