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putrescine/tobak
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Effects of putrescine accumulation in tobacco transgenic plants with different expression levels of oat arginine decarboxylase.
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Arginine decarboxylase (ADC; EC 4.1.1.19) is a key enzyme in one of the two possible ways to synthesize putrescine (Put) in plants. In previous work (Masgrau et al. 1997), we observed an altered phenotype (growth inhibition, leaf chlorosis and necrosis) in tobacco transgenic plants (Nicotiana
Polyamines, hydroxycinnamoylputrescines, and root formation in leaf explants of tobacco cultivated in vitro: effects of the suicide inhibitors of putrescine synthesis.
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In vitro formation of roots is obtained directly, without intermediate growth of callus, from foliar explants of a tobacco (Nicotiana tabacum) plant cultured on Murashige and Skoog medium containing IAA. Auxin-induced root formation was accompanied by significant changes in
Polyamines inhibit NADPH oxidase-mediated superoxide generation and putrescine prevents programmed cell death induced by polyamine oxidase-generated hydrogen peroxide.
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Our previous results indicate that during protoplast isolation an oxidative burst occurs [A.K. Papadakis and KA Roubelakis-Angelakis (1999) Plant Physiol 127:197-205] and that suppression of totipotency is correlated with reduced antioxidant activity and low redox state [A.K. Papadakis et al.
Putrescine N-methyltransferase in Solanum tuberosum L., a calystegine-forming plant.
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Putrescine N-methyltransferase (PMT, EC 2.1.1.53) catalyses the first specific step in the biosynthesis of tropane and nicotine alkaloids. Potato (Solanum tuberosum L.) contains neither nicotine nor the medicinal tropane alkaloids hyoscyamine or scopolamine, but calystegines. They are nortropane
Intraspecific variability of the tandem repeats in Nicotiana putrescine N-methyltransferases.
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The putrescine N-methyltransferase (PMT) cDNA clone previously isolated from tobacco encodes a spermidine synthase-like protein with an 11 amino acid element repeated four times in tandem at the amino terminus. Genomic Southern blot analyses indicated that this N-terminal repeat array is found in
Boron deficiency increases putrescine levels in tobacco plants.
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Polyamine concentrations were determined in leaves and roots of tobacco plants (Nicotiana tabacum L.) subjected to a short-term boron deficiency. A decrease in the growth of shoots and, especially, roots was found under this mineral deficiency. Boron deficiency did not lead to a significant decrease
alpha-dl-Difluoromethylornithine, a Specific, Irreversible Inhibitor of Putrescine Biosynthesis, Induces a Phenotype in Tobacco Similar to That Ascribed to the Root-Inducing, Left-Hand Transferred DNA of Agrobacterium rhizogenes.
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alpha-dl-Difluoromethylarginine (DFMA) and alpha-dl-difluoromethylornithine (DFMO), specific irreversible inhibitors of putrescine biosynthesis were applied to Nicotiana tabacum var. Xanthi nc during floral induction. DFMO, but not DFMA, induced a phenotype in tobacco that resembles the transformed
Effects of the suicide inhibitors of arginine and ornithine decarboxylase activities on organogenesis, growth, free polyamine and hydroxycinnamoyl putrescine levels in leaf explants of Nicotiana xanthi N.C. Cultivated in vitro in a medium producing callus formation.
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We studied the effects of dl-alpha-difluoromethylarginine (DFMA) and dl-alpha-difluoromethylornithine (DFMO), specific, irreversible inhibitors of arginine decarboxylase (ADC) and ornithine decarboxylase (ODC), respectively, on organogenesis growth and titers of free polyamines and conjugated
Alkaloids in plants and root cultures of Atropa belladonna overexpressing putrescine N-methyltransferase.
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Putrescine N-methyltransferase (PMT) is the first alkaloid-specific enzyme for nicotine and tropane alkaloid formation. The pmt gene from Nicotiana tabacum was fused to the CaMV 35S promoter and integrated into the Atropa belladonna genome. Transgenic plants and derived root cultures were analysed
Expression of an antisense Datura stramonium S-adenosylmethionine decarboxylase cDNA in tobacco: changes in enzyme activity, putrescine-spermidine ratio, rhizogenic potential, and response to methyl jasmonate.
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S-adenosylmethionine decarboxylase activity (SAMDC; EC 4.1.1.21) leads to spermidine and spermine synthesis through specific synthases which use putrescine, spermidine and decarboxylated S-adenosylmethionine as substrates. In order to better understand the regulation of polyamine (PA), namely
Phosphate Mediated Regulation of Cinnamoyl Putrescine Biosynthesis in Cell Suspension Cultures of Nicotiana tabacum.
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The accumulation of cinnamoyl putrescines by cell suspension cultures of NICOTIANA TABACUM was enhanced manifold by phosphate limitation of the culture medium while growth was reduced under such conditions. The enhanced product formation was preceded by a large increase and subsequent decline of
Purification and Properties of Putrescine Hydroxycinnamoyl Transferase from Tobacco (Nicotiana tabacum) Cell Suspensions.
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The enzyme putrescine hydroxycinnamoyl transferase (PHT) was purified 400-fold in 7.1% yield from tobacco (Nicotiana tabacum L. cv Xanthi) cell suspensions to a final specific activity of 45 nanokatal per milligram protein. The purification procedure involved conventional chromatography techniques
Influence of accumulated phosphate on culture growth and formation of cinnamoyl putrescines in medium-induced cell suspension cultures of Nicotiana tabacum.
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The inorganic phosphate of the liquid nutrient medium was completely taken up by freshly inoculated cells of Nicotiana tabacum L. within the first 2 d of culture. Thus intracellular ortho-phosphate concentrations of approx. 0.06 M were accumulated, which upon growth of the cultures were diluted by
Wound-induced gene expression of putrescine N-methyltransferase in leaves of Nicotiana tabacum.
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Putrescine N-methyltransferase (PMT) catalyzes the first committed step in the biosynthesis of pyrrolinium ring-containing alkaloids. Earlier studies have indicated that PMT gene expression is restricted to root tissue in Solanaceus plant species. During the analysis to further elucidate factors
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
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