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Pagina 1 a partire dal 224 risultati
Anti-inflammatory and antioxidant activities of methanol extracts and alkaloid fractions of four Mexican medicinal plants of Solanaceae.
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BACKGROUND
Methanol extracts and alkaloid fractions of different parts of four plant species belonging to Solanaceae family and used in Mexican traditional medicine were investigated for their total phenolic contents, anti-inflammatory and antioxidant properties.
METHODS
The total phenolic compounds
Actions of piperidine alkaloid teratogens at fetal nicotinic acetylcholine receptors.
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Teratogenic alkaloids are found in many species of plants including Conium maculatum L., Nicotiana glauca, Nicotiana tabaccum, and multiple Lupinus spp. Fetal musculoskeletal defects produced by alkaloids from these plants include arthrogyropisis, scoliosis, torticollis, kyposis, lordosis, and cleft
Ethylene response factor NtERF91 positively regulates alkaloid accumulations in tobacco (Nicotiana tabacum L.).
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Tobacco alkaloid metabolism is regulated by various transcription factors (TFs). Here, we have characterized a non-NIC2 locus gene, Ethylene Response Factor 91 (ERF91), function in regulation of alkaloid accumulation in tobacco. NtERF91 was preferentially expressed in roots and induced by jasmonic
Alteration of the alkaloid profile in genetically modified tobacco reveals a role of methylenetetrahydrofolate reductase in nicotine N-demethylation.
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Methylenetetrahydrofolate reductase (MTHFR) is a key enzyme of the tetrahydrofolate (THF)-mediated one-carbon (C1) metabolic network. This enzyme catalyzes the reduction of 5,10-methylene-THF to 5-methyl-THF. The latter donates its methyl group to homocysteine, forming methionine, which is then used
Teratogenicity in swine of the tobacco alkaloid anabasine isolated from Nicotiana glauca.
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Nicotiana glauca, wild tree tobacco, induces arthrogrypotic congenital defects in piglets similar to those induced by Nicotiana tabacum, common tobacco. The present work was conducted to isolate the principal alkaloid of N. glauca, anabasine, in large quantity and good purity and to test the
Root-to-shoot translocation of alkaloids is dominantly suppressed in Nicotiana alata.
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In tobacco (Nicotiana tabacum), nicotine and related pyridine alkaloids are produced in the root, and then transported to the aerial parts where these toxic chemicals function as part of chemical defense against insect herbivory. Although a few tobacco transporters have been recently reported to
Effect of photoperiod and end-of-day light quality on alkaloids and phenolic compounds of tobacco.
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Tobacco plants (Nicotiana tabacum L.) were grown on long or short photoperiods followed by 5 minutes of red or far red radiation each day. Plants that received 16-hour photoperiods had a significantly higher concentration of total alkaloids and total phenolics than those that received 8-hour
Damage-induced alkaloids in tobacco: Pot-bound plants are not inducible.
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Field-grown wild tobacco plants (Nicotiana sylvestris) were subjected to a defoliation regime designed to mimic the rate and amount of leaf mass removed by one tobacco hornworm per plant. Undamaged leaves on these plants undergo a dramatic (457% for leaf position 5, 410% for leaf position 8)
Modified alkaloid pattern in developing tobacco callus.
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Developing Nicotiana tabacum L. cv. Wisconsin-38 callus grown on modified Murashige-Skoog (MS) medium with Kao organic acids (pyruvic, citric, malic and fumaric acids) contains abnormally high levels of nornicotine and total alkaloids when compared with the leaves of the donor plant.
Alkaloid Changes in Tobacco Seeds during Germination.
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Nicotine, nornicotine, anabasine, and anatabine, normally found in growing and mature tobacco (Nicotiana tabacum L.) plants, were extracted and quantified from mature tobacco seeds and young tobacco seedlings. The rate of net alkaloid disappearance and accumulation in tobacco seedlings was related
Genetic variation in alkaloid accumulation in leaves of Nicotiana.
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Alkaloids are plant secondary metabolites that are widely distributed in Nicotiana species and contribute greatly to the quality of tobacco leaves. Some alkaloids, such as nornicotine and myosmine, have adverse effects on human health. To reduce the content of harmful alkaloids in tobacco leaves
Alkaloid chemophenetics and transcriptomics of the Nicotiana genus
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In this study, we determined the pyridine alkaloid content (nicotine, nornicotine, anabasine, anatabine, cotinine, and myosmine) of 58 species and 2 subspecies of the Nicotiana genus by ultra-high-performance liquid chromatography coupled with mass spectrometry. We observed clear correlation between
Survival and development of Heliothis virescens (Lepidoptera: Noctuidae) larvae on isogenic tobacco lines with different levels of alkaloids.
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Levels of pyridine alkaloids were measured in 18 tobacco, Nicotiana tabacum L., entries from three parental isolines ('NC 95', 'SC 58', and 'Coker 139'), grown at Tifton, GA, Florence, SC, and Oxford, NC, in 1991. Levels of alkaloids in bud leaves (first fully unfolded leaf below the apical leaf
Reactive oxygen species regulate alkaloid metabolism in undifferentiated N. tabacum cells.
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Plants produce an immense number of natural products and undifferentiated cells from various plant tissues have long been considered an ideal source for their synthesis. However, undifferentiated plant cells often either lose their biosynthetic capacity over time or exhibit immediate repression of
"Self" and "non-self" in the control of phytoalexin biosynthesis: plant phospholipases A2 with alkaloid-specific molecular fingerprints.
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The overproduction of specialized metabolites requires plants to manage the inherent burdens, including the risk of self-intoxication. We present a control mechanism that stops the expression of phytoalexin biosynthetic enzymes by blocking the antecedent signal transduction cascade. Cultured cells
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