hyoscyamus/nicotiana

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Hyoscyamus muticus + Nicotiana tabacum fusion hybrids selected via auxotroph complementation.

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התחבר הרשם

Protoplasts of the nicotinamide-deficient Hyoscyamus muticus cell line nic(-) IVH2 and of the nitrate reductase-deficient Nicotiana tabacum cell line NR(-) cnx 68 were induced to fuse. Selection for putative interspecific hybrid clones was via auxotroph complementation. Controls included tests for

Self-fertile cybrids Nicotiana tabacum (+ Hyoscyamus aureus) with a nucleo-plastome incompatibility.

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התחבר הרשם

Cytoplasmic hybrids (cybrids) in a novel inter-generic combination, Nicotiana tabacum (+ Hyoscyamus aureus), were generated by fusion of protoplasts from a plastome tobacco albino mutant (line R100a1) and gamma-irradiated green protoplasts of H. aureus. Cybrids possessed a plastome of H. aureus and

New CMS-associated phenotypes in cybrids Nicotiana tabacum L. (+Hyoscyamus niger L.).

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התחבר הרשם

Morphological characteristics were studied in cytoplasmic male sterile (CMS) cybrids possessing the tobacco nuclear genome, Hyoscyamus niger plastome and recombinant mitochondria. After backcrosses with tobacco, new flower modifications were found, including: conversions of stamens into branched

Promotion of nicotine biosynthesis in transgenic tobacco by overexpressing allene oxide cyclase from Hyoscyamus niger.

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התחבר הרשם

Plant secondary metabolites are a wide variety of low-molecular weight compounds whose productions are often enhanced in response to both biotic and abiotic stresses. Many of the responses are mediated by a class of hormones, named as jasmonates. In jasmonate biosynthetic pathway of plants, allene

Extensive developmental and metabolic alterations in cybrids Nicotiana tabacum (+ Hyoscyamus niger) are caused by complex nucleo-cytoplasmic incompatibility.

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התחבר הרשם

The genetic basis of multiple phenotypic alterations was studied in cell-engineered cybrids Nicotiana tabacum (+ Hyoscyamus niger) combining the nuclear genome of N. tabacum, plastome of H. niger and recombinant mitochondria. The plants possess a complex, maternally inheritable syndrome of

Tropane alkaloids production in transgenic Hyoscyamus niger hairy root cultures over-expressing putrescine N-methyltransferase is methyl jasmonate-dependent.

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התחבר הרשם

The cDNA from Nicotiana tabacum encoding Putrescine N-methyltransferase (PMT), which catalyzes the first committed step in the biosynthesis of tropane alkaloids, has been introduced into the genome of a scopolamine-producing Hyoscyamus niger mediated by the disarmed Agrobacterium tumefaciens strain

In vitro hybridization by sexual methods and by fusion of somatic protoplasts : Experiments with Nicotiana tabacum x Petunia hybrida, N. tabacum x Hyoscyamus niger, H. niger x P. hybrida, Melandrium album x P. hybrida.

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התחבר הרשם

1. No hybrid plants of Nicotiana tabacum + Petunia hybrida were regenerated from calluses of fusion experiments with mesophyll protoplasts of N. tabacum s, s (2) and v and of P. hybrida mu 1 (2). 2. After in vitro pollination of ovules of N. tabacum with pollen of P. hybrida, filamentous proembryos

Enhanced secretion of tropane alkaloids in Nicotiana tabacum hairy roots expressing heterologous hyoscyamine-6beta-hydroxylase.

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התחבר הרשם

Hyoscyamine-6beta-hydroxylase (H6H; EC 1.14.11.11) catalyses oxidative reactions in the biosynthetic pathway leading from hyoscyamine to the more pharmaceutically valuable tropane alkaloid scopolamine. The h6h gene encoding H6H from Hyoscyamus niger was introduced, under the control of the CaMV 35S

Identifying functional domains within terpene cyclases using a domain-swapping strategy.

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התחבר הרשם

Cyclic terpenes and terpenoids are found throughout nature. They comprise an especially important class of compounds from plants that mediate plant- environment interactions, and they serve as pharmaceutical agents with antimicrobial and anti-tumor activities. Molecular comparisons of several

Immunochemical comparison of glutamine synthetases from some solanaceae plants.

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התחבר הרשם

The presence of different glutamine synthetase isoenzymes in different Solanaceae plants and their relative antigenicities against antiglutamine synthetase from tomato leaf serum were studied. All the plants tested showed one glutamine synthetase isoenzyme except for Mandragora autumnalis, which

Reconstitution of plant nitrate reductase by Escherichia coli extracts and the molecular cloning of the chlA gene of Escherichia coli K12.

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התחבר הרשם

Extracts from Escherichia coli, wild type and chlB, chlC, chlD, chlE, and chlG, but not chlA mutants, were able to reconstitute the nitrate reductase activity in Nicotiana tabacum cnx68 and Hyoscyamus muticus MA-2 mutant extracts. Because cnx68 and MA-2 lack the molybdenum cofactor required for

Molecular cloning of plant spermidine synthases.

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התחבר הרשם

Four cDNAs for spermidine synthase (SPDS), which converts the diamine putrescine to the higher polyamine spermidine using decarboxylated S-adenosylmethionine as the co-factor, were isolated from Nicotiana sylvestris, Hyoscyamus niger, and Arabidopsis thaliana. When the N.sylvestris SPDS cDNA was

Quantitative exploration of the catalytic landscape separating divergent plant sesquiterpene synthases.

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התחבר הרשם

Throughout molecular evolution, organisms create assorted chemicals in response to varying ecological niches. Catalytic landscapes underlie metabolic evolution, wherein mutational steps alter the biosynthetic properties of enzymes. Here we report the first systematic quantitative characterization of

Biosynthetic potential of sesquiterpene synthases: product profiles of Egyptian Henbane premnaspirodiene synthase and related mutants.

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התחבר הרשם

The plant terpene synthase (TPS) family is responsible for the biosynthesis of a variety of terpenoid natural products possessing diverse biological functions. TPSs catalyze the ionization and, most commonly, rearrangement and cyclization of prenyl diphosphate substrates, forming linear and cyclic

Intraspecific variability of the tandem repeats in Nicotiana putrescine N-methyltransferases.

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התחבר הרשם

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

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Herbal & Natural Medicine

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