Exudate Flavonoids in Asteraceae from Arizona, California and Mexico

Abstract

A steraceae, A stereae, Eupatorieae, Helenieae, Heliantheae, Exudate Flavonoids A series of A steraceae, belonging to the tribes Astereae, Eupatorieae, Helenieae and Heli antheae, have been analyzed for the presence of flavonoid aglycones accumulated on leaf and stem surfaces. Methyl ethers of apigenin, luteolin, kaempferol, and quercetin as well as methyl ethers of their relevant 6 -hydroxy derivatives were abundant, whereas 8 -O-substituted derivatives and flavanones were encountered only occasionally; 6 ,8 -di-O-substituted flavonols were found in only one species.

Chemodiversity of Exudate Flavonoids in Seven Tribes of Cichorioideae and Asteroideae (Asteraceae)

“…Gray, while E. staechadifolium Lag. yielded qu/-3-Me/-3Ј-Me/ -3,3Ј-diMe; queg-3,6-diMe/-3,6,3Ј-triMe (Wollenweber et al, 1997b). Apart from these results, no further flavonoid data are available on this genus.…”

“…Therefore, § Part V in the series "Exudate Flavonoids in Miscellaneous Asteraceae". For Part IV see Wollenweber et al (2005), for Part III see Wollenweber et al (1997b). Earlier, we have shown that some accumulation tendencies apparently exist in single tribes (Wollenweber and Valant-Vetschera, 1996).…”

“…integrifolia Nutt. (Wollenweber et al, 1997b). No 6-substituted flavonoids were found in the exudates of G. tenella; similarly, resin of G. camporum Greene contained only ap-4-Me, qu/-3,3Ј-diMe and kae-3,7-diMe (Hoffmann et al, 1984).…”

“…A. Gray was found to accumulate a series of 8-OMe flavone derivatives in its exudate (Wollenweber et al, 1997b).…”

Eudesmane Sesquiterpenes and Other Constituents from Aster himalaicus

“…-Extensive chromatographic purification of the petroleum ether/Et 2 O/MeOH 1 : 1 : 1 extract of the whole plant of Aster himalaicus led to the isolation of a new eudesmane sesquiterpene, 1-oxoeudesm-11(13)-eno-12,8a-lactone (1), along with twelve known compounds, including ilicic acid (2) [9], (7aH)-3-oxoeudesma-4,11(13)-dien-12-oic acid (3) [10], (5a,7aH)-2-oxoeudesma-3,11(13)-dien-12-oic acid (4) [11], luteolin (5) [12], 5,6-dihydroxy-3,7,4'-trimethoxyflavonol (6) [13], 5,6,3'-trihydroxy-3,7,4'-trimethoxyflavonol (7) [14], 5,6-dihydroxy-3,7,3',4'-tetramethoxyflavonol (8) [15], b-sitosterol, 3,4-dihydroxybenzaldehyde [16], p-hydroxybenzoic acid methyl ester [17], 3,4-dihydroxybenzoic acid [17], and 4-hydroxy-3-methoxybenzoic acid [17]. b-Sitosterol was identified on the basis of melting point and TLC comparison with an authentic sample.…”