Abstract
Flavonoids generally occur in higher plants as water-soluble glycosides. However, lipophilic flavonoid aglycones can be excreted by glandular trichomes or extruded through the cuticle. They are accumulated on the plant surface as constituents of leaf resins or thin epicuticular layers. External flavonoid aglycones are found in various families throughout the higher plants, but appear to be most abundant in theAsteraceae. They occur relatively frequently in plants of (semi-)arid habitats. It is advantageous for chemotaxonomic studies that the structural diversity of exudate flavonoids is normally greater than that of the tissue glycosides in these plants.
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Vorgetragen auf der Tagung der Deutschen Botanischen Gesellschaft, Wien, September 1984.
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Wollenweber, E. Exkret-Flavonoide bei Höheren Pflanzen arider Gebiete. Pl Syst Evol 150, 83–88 (1985). https://doi.org/10.1007/BF00985569
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DOI: https://doi.org/10.1007/BF00985569