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catharanthus roseus/nikotin
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Nucleotide sequence of the tryptophan decarboxylase gene of Catharanthus roseus and expression of tdc-gusA gene fusions in Nicotiana tabacum.
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The enzyme tryptophan decarboxylase (TDC; EC 4.1.1.28) converts tryptophan into tryptamine. In Catharanthus roseus and other plants capable of producing terpenoid indole alkaloids (TIAs) TDC links primary metabolism to the secondary metabolic pathway involved in the biosynthesis of these compounds.
Expression of two consecutive genes of a secondary metabolic pathway in transgenic tobacco: molecular diversity influences levels of expression and product accumulation.
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We have created a population of transgenic tobacco plants carrying cDNAs encoding two consecutive enzymes from early stages in monoterpenoid alkaloid biosynthesis in Catharanthus roseus. The cDNAs, encoding tryptophan decarboxylase (tdc) and strictosidine synthase (str1) together with a selectable
Subcellular localization of the coat protein in tobacco cells infected by cucumber mosaic virus isolated from Catharanthus roseus.
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Electron microscopy and immunolabelling with antiserum specific to cucumber mosaic virus coat protein were used to examine tobacco leaf cells infected by cucumber mosaic virus isolated from Catharanthus roseus (CMV-Cr). Crystalline and amorphous inclusions in the vacuoles were the most obvious
Suppression of aggressive strains of 'Candidatus phytoplasma mali' by mild strains in Catharanthus roseus and Nicotiana occidentalis and indication of similar action in apple trees.
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To study antagonistic interactions of 'Candidatus Phytoplasma mali' strains, graft inoculation of Catharanthus roseus and Nicotiana occidentalis was performed with mild strains 1/93Vin and 1/93Tab as suppressors and three aggressive strains as challengers. Inoculation of the suppressors was carried
A G-box element from the Catharanthus roseus strictosidine synthase (Str) gene promoter confers seed-specific expression in transgenic tobacco plants.
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The enzyme encoded by the strictosidine synthase (Str) gene from Catharanthus roseus catalyses a key step in the biosynthesis of the pharmaceutically important terpenoid indole alkaloids. Str cDNA and genomic clones have already been isolated, allowing us to study the regulation of Str gene
Tobacco ringspot virus Found in the Cardboard Cycad (Zamia furfuracea) in Florida.
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Zamia furfuracea (Zamiaceae) is native of coastal Mexico. It is a popular houseplant and easy to grow outdoors in warm climates. In November 2005, a plant of Z. furfuracea, originally from Texas, was received at the Division of Plant Industry in Gainesville, FL. The plant had numerous chlorotic
Fatty-acid composition and biosynthesis in cell suspension cultures of Glycine max (L.) Merr., Catharanthus roseus G. Don and Nicotiana tabacum L.
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The fatty-acid composition of C. roseus and N. tabacum cell suspension cultures was unaffected by subculture on Wood and Braun, Murashige and Skoog, or Gamborg B5C media. However, placing the cultures - which were normally grown at 25° C - at 15° C reduced growth but resulted in enhanced formation
Kinetics and stoichiometry of growth of plant cell cultures of Catharanthus roseus and Nicotiana tabacum in batch and continuous fermentors.
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Plant cell suspension cultures of Catharanthus roseus and Nicotiana tabacum were grown in stirred tank bioreactors operated in batch and continuous mode. The stoichiometry of growth of both species in steady-state glucose limited chemostats was studied at a range of different dilution rates. A
High levels of tryptamine accumulation in transgenic tobacco expressing tryptophan decarboxylase.
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A full-length complementary DNA clone encoding tryptophan decarboxylase (TDC; EC 4.1.1.28) from Catharanthus roseus (De Luca V, Marineau C, Brisson N [1989] Proc Natl Acad Sci USA 86: 2582-2586) driven by the CaMV 35S promoter was introduced into tobacco (Nicotiana tabacum) to direct the synthesis
Functional analysis of the DAT gene promoter using transient Catharanthus roseus and stable Nicotiana tabacum transformation systems.
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The Catharanthus roseus DAT gene encodes the enzyme acetyl-CoA:deacetylvindoline-4-O-acetyltransferase involved in the last step of the indole alkaloid pathway leading to vindoline. This gene is characterized by specific cell type expression in idioblasts and laticifers. To understand the specific
APETALA2/ETHYLENE RESPONSE FACTOR and basic helix-loop-helix tobacco transcription factors cooperatively mediate jasmonate-elicited nicotine biosynthesis.
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Transcription factors of the plant-specific apetala2/ethylene response factor (AP2/ERF) family control plant secondary metabolism, often as part of signalling cascades induced by jasmonate (JA) or other elicitors. Here, we functionally characterized the JA-inducible tobacco (Nicotiana tabacum)
The promoter of the strictosidine synthase gene from periwinkle confers elicitor-inducible expression in transgenic tobacco and binds nuclear factors GT-1 and GBF.
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Strictosidine synthase (STR) is a key enzyme in the biosynthesis of terpenoid indole alkaloids. This class of secondary metabolites harbours several pharmaceutically important compounds used, among other applications, in cancer treatment. Terpenoid indole alkaloid biosynthesis and expression of
Virus-induced gene silencing in Catharanthus roseus by biolistic inoculation of tobacco rattle virus vectors.
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Catharanthus roseus constitutes the unique source of several valuable monoterpenoid indole alkaloids, including the antineoplastics vinblastine and vincristine. These alkaloids result from a complex biosynthetic pathway encompassing between 30 and 50 enzymatic steps whose characterisation is still
Expression of enzymatically active and correctly targeted strictosidine synthase in transgenic tobacco plants.
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Strictosidine, a precursor to over 1000 indole alkaloids including the anti-tumor drugs vinblastine, vincristine, and camptothecin, is produced by the condensation of tryptamine and secologanin. Strictosidine synthase, the enzyme responsible for this condensation, is the first committed step in the
Suspension cultured transgenic cells of Nicotiana tabacum expressing tryptophan decarboxylase and strictosidine synthase cDNAs from Catharanthus roseus produce strictosidine upon secologanin feeding.
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A transgenic cell suspension culture of Nicotiana tabacum L. `Petit Havana' SR1 was established expressing tryptophan decarboxylase and strictosidine synthase cDNA clones from Catharanthus roseus (L.) G. Don under the direction of cauliflower mosaic virus 35S promoter and nopaline synthase
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