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15 rezultatima
CYP712K4 Catalyzes the C-29 Oxidation of Friedelin in the Maytenus ilicifolia Quinone Methide Triterpenoid Biosynthesis Pathway.
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The native Brazilian plant Maytenus ilicifolia accumulates a set of quinone methide triterpenoids with important pharmacological properties, among which maytenin, pristimerin and celastrol that accumulate exclusively in the root bark of this medicinal plant. The first committed step in the quinone
Plant cell death caused by fungal, bacterial, and viral elicitors: protective effect of mitochondria-targeted quinones.
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Chitosan (partially deacetylated chitin), a component of fungal cell walls, caused epidermal cell (EC) death in the leaves of pea (Pisum sativum L.) and tobacco Nicotiana tabacum or Nicotiana benthamiana detected by destruction of cell nuclei. The mitochondria-targeted quinone SkQ1 prevented the
NAD(P)H:(Quinone-Acceptor) Oxidoreductase of Tobacco Leaves Is a Flavin Mononucleotide-Containing Flavoenzyme.
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The soluble NAD(P)H:(quinone-acceptor) oxidoreductase [NAD(P)H-QR, EC 1.6.99.2] of Nicotiana tabacum L. leaves and roots has been purified. NAD(P)H-QR contains noncovalently bound flavin mononucleotide. Pairs of subunits of 21.4 kD are linked together by disulfide bridges, but the active enzyme is a
Enhanced ferredoxin-dependent cyclic electron flow around photosystem I and alpha-tocopherol quinone accumulation in water-stressed ndhB-inactivated tobacco mutants.
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Dissipation mechanisms of excess photon energy under water stress were studied in ndhB-inactivated tobacco (Nicotiana tabacum cv. Xanthi) mutants, which are impaired in NAD(P)H dehydrogenase-dependent cyclic electron flow around PSI. Relative leaf water content and net CO(2) assimilation decreased
Ferredoxin limits cyclic electron flow around PSI (CEF-PSI) in higher plants--stimulation of CEF-PSI enhances non-photochemical quenching of Chl fluorescence in transplastomic tobacco.
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We tested the hypothesis that ferredoxin (Fd) limits the activity of cyclic electron flow around PSI (CEF-PSI) in vivo and that the relief of this limitation promotes the non-photochemical quenching (NPQ) of Chl fluorescence. In transplastomic tobacco (Nicotiana tabacum cv Xanthi) expressing Fd from
Characterization of photosystem II photochemistry in transgenic tobacco plants with lowered Rubisco activase content.
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Rubisco activase plays an important role in the regulation of CO(2) assimilation. However, it is unknown how activase regulates photosystem II (PSII) photochemistry. To investigate the effects of Rubisco activase on PSII photochemistry, we obtained transgenic tobacco (Nicotiana tabacum) plants with
Different enhancement of senescence induced by metabolic products of Alternaria alternata in tobacco leaves of different ages.
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The purpose of this study was to explore the mechanisms by which Alternaria alternata damages tobacco (Nicotiana tabacum) leaves. Treatment with A. alternata metabolic products enhanced senescence in leaves of different ages, as indicated by the significant decrease in chlorophyll, soluble protein,
On the acceptor specificity of glycollate oxidase of Nicotiana tabacum.
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The effect of compounds on the activity of ammonium sulphate preparations of glycollate oxidase from Nicotiana tabacum cv. John Williams' Broadleaf and the aurea mutant Su/su is reported. Coupling to DCPIP as terminal oxidant under anaerobic conditions gave greater rates of glycollate oxidation than
Lysinibacillus tabacifolii sp. nov., a novel endophytic bacterium isolated from Nicotiana tabacum leaves.
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A Gram-positive, catalase- and oxidase-positive, strictly aerobic, endospore-forming rod bacterium, designated K3514(T), was isolated from the leaves of Nicotiana tabacum. The strain was able to grow at temperatures of 8-40°C, pH 5.0-10.0 and NaCl concentrations of 0-7%. The predominant quinones
Analysis of CoQ10 in cultivated tobacco by a high-performance liquid chromatography-ultraviolet method.
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Coenzyme Q (CoQ) is a naturally occurring lipid-soluble quinone that performs multiple functions in all living cells and has become a popular antioxidant supplement, a coadjuvant in the treatment of heart disease, and the object of study for treating neurodegenerative disorders. Although there are
Lysobacter tabacisoli sp. nov., isolated from rhizosphere soil of Nicotiana tabacum L.
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A Gram-stain-negative, aerobic, rod-shaped bacterium, designated strain C8-1T, was isolated from the rhizosphere soil of Nicotiana tabacum L. collected from Kunming, south-west China. The cells showed oxidase-positive and catalase-positive reactions. Growth was observed at 10-40 °C, at pH
Pretreatment with alternation of light/dark periods improves the tolerance of tobacco (Nicotiana tabacum) to clomazone herbicide.
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This work analyses the effects of alternation of light/dark periods pretreatment (AL) in tobacco plantlets (Nicotiana tabacum L. cv.Virginie vk51) growing in solution with low concentration of the clomazone herbicide. The experimentation has been carried out by exposing the plantlets to successive
Biochemical Basis of Resistance of Tobacco Callus Tissue Cultures to Hydroxyphenylethylamines.
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It has been reported that hydroxyphenylethylamines, such as tyramine and octopamine, are toxic to tobacco (Nicotiana tabacum L.) callus cultures grown in the presence of auxins, whereas calli grown in the presence of cytokinins and crown gall cultures are resistant to these amines (P. Christou and
Flavisolibacter nicotianae sp. nov., isolated from rhizosphere soil of Nicotiana tabacum L.
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A Gram-stain-negative, aerobic, non-motile and rod-shaped bacterium, designated strain X7XT, was isolated from a rhizosphere soil sample of Nicotiana tabacum L. collected from a tobacco factory located in Kunming, south-western China. The cells showed oxidase-positive and
Sphingobacterium nematocida sp. nov., a nematicidal endophytic bacterium isolated from tobacco.
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A novel Gram-negative strain, designated M-SX103(T), was isolated from a fresh leaf of Nicotiana tabacum Linn. collected at Yuxi City, Yunnan province, China, and subjected to a polyphasic taxonomic study. Growth occurred at 10-40 °C, at pH 6.0-9.0 and with 0-3% (w/v) NaCl. The predominant
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