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10 rezultatus
Senecionine, Seneciphylline, Jacobine and Otosenine from Senecio cineraria.
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Otosenine from Senecio aureus.
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Methyl Jasmonate Changes the Composition and Distribution Rather than the Concentration of Defence Compounds: a Study on Pyrrolizidine Alkaloids.
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In this study we investigated the effect of methyl jasmonate (MeJA) application on pyrrolizidine alkaloid (PA) concentration and composition of two closely related Jacobaea species. In addition, we examined whether MeJA application affected herbivory of the polyphagous leaf feeding herbivore
Alkaloids from Senecio aegyptius and S. desfontainei.
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Otosenine and senecionine/seneciphyllme were isolated from Senecio aegyptius and S. desfontainei, respectively. Senecionine and seneciphylline easily cocrystallize; m.p. and IR-spectra of mixtures of both alkaloids and their separation by PC are described. IR evidence of individual alkaloids and of
Pyrrolizidine alkaloid variation in shoots and roots of segregating hybrids between Jacobaea vulgaris and Jacobaea aquatica.
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Hybridization can lead to novel qualitative or quantitative variation of secondary metabolite (SM) expression that can have ecological and evolutionary consequences. We measured pyrrolizidine alkaloid (PA) expression in the shoots and roots of a family including one Jacobaea vulgaris genotype and
The relationship between structurally different pyrrolizidine alkaloids and western flower thrips resistance in F(2) hybrids of Jacobaea vulgaris and Jacobaea aquatica.
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Segregating plant hybrids often have more ecological and molecular variability compared to parental species, and are therefore useful for studying relationships between different traits, and the adaptive significance of trait variation. Hybrid systems have been used to study the relationship between
Pyrrolizidine alkaloid composition influences cinnabar moth oviposition preferences in Jacobaea hybrids.
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Plants produce a variety of secondary metabolites (PSMs) that may be selective against herbivores. Yet, specialist herbivores may use PSMs as cues for host recognition, oviposition, and feeding stimulation, or for their own defense against parasites and predators. This summarizes a dual role of
Pyrrolizidine alkaloids from Senecio lorenthii.
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The isolation and NMR spectra of otosenine (1) and seneciphylline (2) from Senecio lorenthii are reported.
Macrocyclic pyrrolizidine alkaloids from Senecio anonymus. Separation of a complex alkaloid extract using droplet counter-current chromatography.
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Ten 12-membered macrocyclic pyrrolizidine alkaloids, all of them esters of the necines, retronecine or otonecine, have been isolated from Senecio anonymus. The separation, carried out by droplet counter-current chromatography, afforded senecionine [1], integerrimine [2], retrorsine [3], senkirkine
Pyrrolizidine alkaloid profiles of the Senecio cineraria group (Asteraceae).
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Alkaloid profiles of five Senecio species (Asteraceae), including S. ambiguus subsp. ambiguus, S. ambiguus subsp. nebrodensis, S. gibbosus subsp. bicolor, S. gibbosus subsp. gibbosus, and S. gibbosus subsp. cineraria, were studied. Eleven pyrrolizidine alkaloids were identified and their content was
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