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15 rezultati
Scopoletin uptake from culture medium and accumulation in the vacuoles after conversion to scopolin in 2,4-D-treated tobacco cells.
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Tobacco (Nicotiana tabacum L. Bright Yellow) T-13 cell line has the ability to produce scopoletin endogenously and release some of it into the culture medium. We investigated the mechanism of scopoletin uptake following treatment of a tobacco culture with 2,4-dichlorophenoxyacetic acid (2,4-D).
Effect of 2,4-dichlorophenoxyacetic Acid on glucosylation of scopoletin to scopolin in tobacco tissue culture.
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2,4-Dichlorophenoxyacetic acid (2,4-D) stimulated the formation of scopoletin and scopolin in tobacco (Nicotiana tabacum L. ;Bright Yellow') cell culture. It especially stimulated the uptake of scopoletin from culture medium into the cells and the glucosylation of scopoletin to its monoglucoside,
Immobilization of Nicotiana tabacum plant cell suspensions within calcium alginate gel beads for the production of enhanced amounts of scopolin.
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Scopolin-producing cells of Nicotiana tabacum were immobilized within Ca-alginate gel beads. Free cell suspensions accumulated scopolin within cytoplasmic compartments and cell disruption was necessary to recover scopolin. On the contrary, immobilized plant cells excreted considerable amounts of
Patterns of phenylpropanoids in non-inoculated and potato virus Y-inoculated leaves of transgenic tobacco plants expressing yeast-derived invertase.
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The patterns of secondary metabolites in leaves of yeast invertase-transgenic tobacco plants (Nicotiana tabacum L. cv. Samsun NN) were analyzed. Plants expressing cytosolic yeast-derived invertase (cytInv) or apoplastic (cell wall associated) yeast invertase (cwInv) showed a characteristic
Plant hormone regulation on scopoletin metabolism from culture medium into tobacco cells.
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Tobacco (Nicotiana tabacum L. Bright Yellow) T-13 cell line has an ability for production of scopoletin. In this cell culture, scopoletin is taken up from culture medium and accumulated in vacuoles after conversion to scopolin when cells are treated with 2,4-dichlorophenoxyacetic acid (2,4-D)
Resistance of transgenic tobacco seedlings expressing the Agrobacterium tumefaciens C58-6b gene, to growth-inhibitory levels of cytokinin is associated with elevated IAA levels and activation of phenylpropanoid metabolism.
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We previously reported that the Agrobacterium tumefaciens C58-6b gene confers resistance to growth-inhibitory levels of exogenously applied N(6)-benzyladenine (BA, cytokinin) in transgenic tobacco (Nicotiana tabacum) seedlings. Here, we found that intracellular levels of indoleacetic acid (IAA,
Molecular cloning and heterologous expression of novel glucosyltransferases from tobacco cultured cells that have broad substrate specificity and are induced by salicylic acid and auxin.
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Scopoletin is one of the phytoalexins in tobacco. Cells of the T-13 cell line (Nicotiana tabacum L. Bright Yellow) accumulate a large amount of scopoletin, also known as 7-hydroxy-6-methoxycoumarin, as a glucoconjugate, scopolin, in vacuoles. We report here the molecular cloning of
Purification and characterization of UDP-glucose: hydroxycoumarin 7-O-glucosyltransferase, with broad substrate specificity from tobacco cultured cells.
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The enzyme UDP-glucose: hydroxycoumarin 7-O-glucosyltransferase (CGTase), which catalyzes the formation of scopolin from scopoletin, was purified approximately 1200-fold from a culture of 2,4-D-treated tobacco cells (Nicotiana tabacum L. cv. Bright Yellow T-13) with a yield of 7%. Purification to
Changes in Amount of Polyphenols and Activity of Related Enzymes during Growth of Tobacco Flower and Capsule.
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Developmental stages of tobacco (Nicotiana tabacum L. cv. Burley 21) flower and capsule were correlated with tissue contents of polyphenols and activities of phenylalanine ammonialyase, polyphenoloxidase, and peroxidase. Chlorogenic acid, scopolin, and scopoletin were present in most tissues,
Identification and quantitation of adenosine-3':5'-cyclic monophosphate in plants using gas chromatography-mass spectrometry and high-performance liquid chromatography.
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Direct evidence has been obtained for the presence of adenosine-3':5'-cyclic monophosphate (cAMP) in tobacco (Nicotiana tabacum L.) callus tissue cultures, bean (Phaseolus vulgaris L.) seedlings and immature kernels of sweet corn (Zea mays L.) through the use of a highly specific and sensitive gas
Secondary products in mycorrhizal roots of tobacco and tomato.
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Colonization of the roots of various tobacco species and cultivars (Nicotiana glauca Grah., N. longiflora Cav., N. rustica L., N. tabacum L., N. tabacum L. cv. Samsun NN, N. sanderae hort. Sander ex Wats.) as well as tomato plants (Lycopersicon esculentum L. cv. Moneymaker) by the arbuscular
Over-expression of a scopoletin glucosyltransferase in Nicotiana tabacum leads to precocious lesion formation during the hypersensitive response to tobacco mosaic virus but does not affect virus resistance.
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Nicotiana tabacum Togt encodes a scopoletin glucosyltransferase (UDPglucose:scopoletin O -beta-D-glucosyltrans- ferase, EC 2.4.1.128) known to act in vitro on many different substrates including the 6-methoxy-7-hydroxy- coumarin scopoletin. This phenolic compound accumulates in vast amounts,
Regulation of arbuscular mycorrhization by apoplastic invertases: enhanced invertase activity in the leaf apoplast affects the symbiotic interaction.
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The effect of constitutive invertase overexpression on the arbuscular mycorrhiza (AM) is shown. The analysis of the enhanced potential for sucrose cleavage was performed with a heterozygous line of Nicotiana tabacum 35S::cwINV expressing a chimeric gene encoding apoplast-located yeast-derived
Scopoletin is a phytoalexin against Alternaria alternata in wild tobacco dependent on jasmonate signalling.
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Alternaria alternata (tobacco pathotype) is a necrotrophic fungus causing severe losses in Nicotiana species by infection of mature leaves. Similar to what has been observed in cultivated tobacco, N. tabacum, young leaves of wild tobacco, N. attenuata, were more resistant to A. alternata than mature
IRE1-bZIP60 Pathway Is Required for Nicotiana attenuata Resistance to Fungal Pathogen Alternaria alternata.
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As an endoplasmic reticulum (ER) stress sensor, inositol-requiring enzyme 1 (IRE1) splices the bZIP60 mRNA, and produces an active bZIP60 transcription factor that regulates genes involved in the unfolded protein response (UPR) during ER stresses. This IRE1-bZIP60 pathway is conserved in plant
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