title: Exudate flavonoids in some Gnaphalieae and Inuleae (Asteraceae).
abstract: Three members of the tribe Gnaphalieae and six members of the tribe Inuleae (Asteraceae) were analyzed for their exudate flavonoids. Whereas some species exhibit rather trivial flavonoids, others produce rare compounds. Spectral data of rare flavonoids are reported and their structural identification is discussed. 6-Oxygenation of flavonols is a common feature of two Inula species and Pulicaria sicula. By contrast, flavonoids with 8-oxygenation, but lacking 6-oxygenation, are common in two out of three Gnaphalieae species examined. In addition, B-ring deoxyflavonoids are abundantly present in the leaf exudates of Helichrysum italicum (Gnaphalieae). These distinctive features of the two Asteraceae tribes are in agreement with previous flavonoid surveys of these and related taxa.
authors.affiliation: Institut für Botanik der TU Darmstadt, Germany. wollenweber@bio.tu-darmstadt.de
authors.forename: Eckhard
authors.initials: E
authors.lastname: Wollenweber
authors.forename: Matthias
authors.initials: M
authors.lastname: Christ
authors.forename: R Hugh
authors.initials: RH
authors.lastname: Dunstan
authors.forename: James N
authors.initials: JN
authors.lastname: Roitman
authors.forename: Jan F
authors.initials: JF
authors.lastname: Stevens
mesh_terms: D019659:Asteraceae / Q000737:chemistry* / Q000145:classification; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification*; D044948:Flavonols / Q000737:chemistry* / Q000302:isolation & purification; D036622:Gnaphalium / Q000737:chemistry*; D036562:Helichrysum / Q000737:chemistry; D038143:Inula / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D010936:Plant Extracts / Q000737:chemistry* / Q000302:isolation & purification; D013045:Species Specificity
chemical_list: D005419:Flavonoids; D044948:Flavonols; D010936:Plant Extracts