Flavonoid aglycones and flavonol glycosides in the lipophilic leaf exudate of Nothofagus antarctica

Wollenweber, Eckhard; Stüber, Andreas; Kraut, Ludwig

doi:10.1016/s0031-9422(96)00745-5

Cited by 16 publications

(4 citation statements)

References 7 publications

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“…Thus, although the number of seedlings was shown to range from 0 to 197/m 2 depending on the shade provided by the mother stand, 70-100% seedlings were found to die within the first year [14]. Moreover, Echevarría et al [18] showed that seedling browsing associated with high numbers of livestock suppressed their growth (and resulting forest regeneration) in spite of the fact that N. antarctica is less damaged by browsing than other species in the genus [19].…”

Section: Introductionmentioning

confidence: 99%

Experimental Examination of Vegetative Propagation Methods of Nothofagus antarctica (G. Forst.) Oerst. for Restoration of Fire-Damaged Forest in Torres del Paine National Park, Chile

Cafourek

Maděra

Střítecký³

et al. 2021

Forests

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Nothofagus antarctica (Antarctic beech) is one of the main woody plants in the temperate deciduous forests and anti-boreal forests of the southern hemisphere. Since colonization of the Andean-Patagonian region by European settlers, however, stands of this species have been severely affected by fires caused by human activities, considerably reducing their area. To restore these forests to their area occupied before the fires, it is necessary to use artificial regeneration, relying on production of transplants in forest nurseries. Due to the low capacity for seed propagation, we focus on possibilities of producing seedlings by vegetative propagation. In a trial, we collected cuttings during three sets of dates, and attempted to root them using three combinations of substrate and ten combinations of stimulators. Using the most favorable combination of collection period, substrate and stimulator tested resulted in rooting of 23% of the cuttings, which exceeds the documented germination rates for this species.

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Section: Introductionmentioning

confidence: 99%

Experimental Examination of Vegetative Propagation Methods of Nothofagus antarctica (G. Forst.) Oerst. for Restoration of Fire-Damaged Forest in Torres del Paine National Park, Chile

Cafourek

Maděra

Střítecký³

et al. 2021

Forests

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“…3). Spectroscopy data showed signals characteristic of quercetin-3-Oα-arabinopyranoside (Wollenweber et al 1997;Ahmadu et al 2007), described for the first time for this species. The 1 H-NMR (500 MHz, CD 3 OD) displayed characteristic signals of the aglycone quercetin δ H 6.21 (1H, d, J = 2.0, H-6), 6.41 (1H, d, J = 2.0, H-8), 7.74 (1H, d, J = 2.2, H-2'), 6.90 (1H, d, J = 8.5, H-5'), 7.57 (1H, dd, J = 2.2 and 8.5, H-6') and sugar signals δ H 5.10 (1H, d, J = 6.7, H-1''), 3.90 (1H, dd, J = 6.6 and 8.5, H-2''), 3.65 (1H, dd, J = 3.1 and 8.4, H-3''), 3.83 (1H, s, J = 8.5, H-4''), 3.80 (1H, d, J = 3.5, H-5a''), and 3.43 NO and TNF-α inhibition and cytotoxicity of isolated compounds in LPS-stimulated RAW 264.7 cells Quercetin (2) presented the highest potential in NO (IC 50 4.58±0.95 µg/mL) and TNF-α (IC 50 33.25±0.88 µg/mL) inhibition.…”

Section: Compound Identificationmentioning

confidence: 93%

Humiria balsamifera extract inhibits nitric oxide and tumor necrosis factor production in LPS-stimulated macrophages

et al. 2021

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Humiria balsamifera is used in traditional medicine as anthelmintic, expectorant, to treat hepatitis, diarrhea, hemorrhoids; to cure chronic wounds; and to alleviate toothaches. This species occurs in Jurubatiba shoal, Rio de Janeiro state-Brazil, a rich region which offers a variety of promising bioactive product sources. The present study focuses on the chemical and pharmacological evaluation of H. balsamifera. The n-hexane, dichloromethane and ethyl acetate leaf fractions exhibited higher inhibitory potential on NO production. Friedelin (1), quercetin (2) and quercetin-3-α-O-arabinopyranoside (3) were isolated and characterized; the latter is described for the first time for H. balsamifera. Quercetin (2) showed the best inhibitory activity on NO production and moderate inhibition of TNF-α production. These results contribute to the knowledge of Humiria balsamifera as a source of anti-inflammatory compounds. Furthermore, the identification of the terpenes ß-amyrone, betulin, citronellol, eremophillene, dihydroactinolide and borneol, and the isolation of quercetin-3-α-O-arabinopyranoside are being reported for the first time for this species.

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“…The occurrence of flavonoid glycosides in lipophilic exudates still appears to be a rare phenomenon [16] . Among the Asteraceae, we observed it in Tragopogon pratensis, where they cooccur with flavonoid aglycones [17].…”

Section: Silphium Terebinthinaceum Jacqmentioning

confidence: 99%

New reports on surface flavonoids from Chamaebatiaria (Rosaceae), Dodonaea (Sapindaceae), Elsholtzia (Lamiaceae), and Silphium (Asteraceae)

Wollenweber

Roitman

2007

Natural Product Communications

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Flavonoid aglycones and flavonol glycosides in the lipophilic leaf exudate of Nothofagus antarctica

Cited by 16 publications

References 7 publications

Experimental Examination of Vegetative Propagation Methods of Nothofagus antarctica (G. Forst.) Oerst. for Restoration of Fire-Damaged Forest in Torres del Paine National Park, Chile

Experimental Examination of Vegetative Propagation Methods of Nothofagus antarctica (G. Forst.) Oerst. for Restoration of Fire-Damaged Forest in Torres del Paine National Park, Chile

Humiria balsamifera extract inhibits nitric oxide and tumor necrosis factor production in LPS-stimulated macrophages

New reports on surface flavonoids from Chamaebatiaria (Rosaceae), Dodonaea (Sapindaceae), Elsholtzia (Lamiaceae), and Silphium (Asteraceae)

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