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nicotinic acid/nicotiana
Odkaz sa uloží do schránky
Strana 1 od 16 výsledky
[Metabolism of nicotinic acid in plant cell suspension cultures, IV: Occurrence and metabolism of nicotinic acid N-alpha-arabinoside (author's transl)].
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Application of nicotinic acid to cell suspension cultures of Petroselinum hortense Hoffm., Daucus carota, Nicotiana tabacum and Nicotiana glauca leads to the formation of the recently isolated[2] nicotinic acid N-alpha-L-arabinoside. In these cell cultures the arabinoside is a metabolically active
Potential for use of nicotinic acid as a selective agent for isolation of high nicotine-producing lines of Nicotiana rustica hairy root cultures.
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The addition of exogenous nicotinic acid, nicotinamide or nicotine was studied with reference to their effects on growth and alkaloid production by hairy root cultures of Nicotiana rustica. Nicotinic acid and nicotinamide were toxic (50% phytostatic dose being 2.4 and 9 mM respectively) while
Nicotinic acid as a metabolite of nicotine in Nicotiana rustica.
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Short communications. The incorporation of ( 14 C 4 )aspartic acid into nicotinic acid N-glucoside in Nicotiana tabacum.
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Cloning and functional characterization of quinolinic acid phosphoribosyl transferase (QPT) gene of Nicotiana tabacum.
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The quinolinate phosphoribosyl transferase (QPT) is a key enzyme that converts quinolinic acid into nicotinic acid mononucleotide. The QPT gene plays an essential role in the pyridine nucleotide cycle as well as in the biosynthetic pathway of the alkaloid nicotine. However, a clear role for QPT is
Activation of the de novo pathway for pyridine nucleotide biosynthesis prior to ricinine biosynthesis in castor beans.
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The ricinine content of etiolated seedlings of Ricinus communis increased nearly 12-fold over a 4-day period. In plants quinolinic acid is an intermediate in the de novo pathway for the synthesis of pyridine nucleotides. The only known enzyme in the de novo pathway for pyridine nucleotide
Comparison of secondary product accumulation in photoautotrophic, photomixotrophic and heterotrophic Nicotiana tabacum cell suspension cultures.
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Photoautotrophic, photomixotrophic and heterotrophic Nicotiana tabacum cell suspension cultures were compared for the constitutive accumulation of secondary metabolites and the elicitor-induced formation of the phytoalexin capsidiol. Nicotine and chlorogenic acid were found in high amounts in the
Effects of down-regulating ornithine decarboxylase upon putrescine-associated metabolism and growth in Nicotiana tabacum L.
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Transgenic plants of Nicotiana tabacum L. homozygous for an RNAi construct designed to silence ornithine decarboxylase (ODC) had significantly lower concentrations of nicotine and nornicotine, but significantly higher concentrations of anatabine, compared with vector-only controls. Silencing of ODC
Antisense-mediated down-regulation of putrescine N-methyltransferase activity in transgenic Nicotiana tabacum L. can lead to elevated levels of anatabine at the expense of nicotine.
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Nicotiana tabacum L. produces a number of pyridine alkaloids, with nicotine representing the major component and anatabine comprising most of the remainder of the alkaloid fraction. An antisense approach was used here to down-regulate activity of the important enzyme putrescine N-methyltransferase
Influence of the nutrient medium on the recovery of dividing cells from tobacco protoplasts.
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Systematic tests resulted in a nutrient solution containing the following, in milligrams per liter, for the culture of protoplasts isolated from Nicotiana tabacum L. callus cells: Murashige and Skoog salts (T. Murashige and F. Skoog, 1962. Physiol. Plant. 15: 473-497); sucrose, 15,000; mannitol,
Conditional modulation of NAD levels and metabolite profiles in Nicotiana sylvestris by mitochondrial electron transport and carbon/nitrogen supply.
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Environmental controls on leaf NAD status remain poorly understood. Here, we analyzed the effects of two key environmental variables, CO(2) and nitrogen, on leaf metabolite profiles, NAD status and the abundance of key transcripts involved in de novo NAD synthesis in wild-type (WT) Nicotiana
Enzymatic, expression and structural divergences among carboxyl O-methyltransferases after gene duplication and speciation in Nicotiana.
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Methyl salicylate and methyl benzoate have important roles in a variety of processes including pollinator attraction and plant defence. These compounds are synthesized by salicylic acid, benzoic acid and benzoic acid/salicylic acid carboxyl methyltransferases (SAMT, BAMT and BSMT) which are members
A PIP-family protein is required for biosynthesis of tobacco alkaloids.
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Plants in the Nicotiana genus produce nicotine and related pyridine alkaloids as a part of their chemical defense against insect herbivores. These alkaloids are formed by condensation of a derivative of nicotinic acid, but the enzyme(s) involved in the final condensation step remains elusive. In
The A622 gene in Nicotiana glauca (tree tobacco): evidence for a functional role in pyridine alkaloid synthesis.
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Nicotiana glauca (Argentinean tree tobacco) is atypical within the genus Nicotiana, accumulating predominantly anabasine rather than nicotine and/or nornicotine as the main component of its leaf pyridine alkaloid fraction. The current study examines the role of the A622 gene from N. glauca (NgA622)
Vacuole-localized berberine bridge enzyme-like proteins are required for a late step of nicotine biosynthesis in tobacco.
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Tobacco (Nicotiana tabacum) plants synthesize nicotine and related pyridine-type alkaloids, such as anatabine, in their roots and accumulate them in their aerial parts as chemical defenses against herbivores. Herbivory-induced jasmonate signaling activates structural genes for nicotine biosynthesis
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