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15 النتائج

The effect of Ca-formaldehyde fixation on the activity of the reporter enzyme beta-glucuronidase (GUS) in transgenic tobacco.

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The inhibition of beta-glucuronidase (GUS) activity by Ca-formaldehyde fixation was investigated in leaves of transgenic tobacco (Nicotiana tabacum L.) expressing the beta-glucuronidase uidA reporter gene from Escherichia coli. One-hour fixation of a free-floating leaf disc in a cold fixative

Detoxification of Formaldehyde by the Spider Plant (Chlorophytum comosum L.) and by Soybean (Glycine max L.) Cell-Suspension Cultures.

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The phytotoxicity of formaldehyde for spider plants (Chlorophytum comosum L.), tobacco plants (Nicotiana tabacum L. cv Bel B and Bel W3), and soybean (Glycine max L.) cell-suspension cultures was found to be low enough to allow metabolic studies. Spider plant shoots were exposed to 7.1 [mu]L L-1

Two key arginine residues in the coat protein of Bamboo mosaic virus differentially affect the accumulation of viral genomic and subgenomic RNAs.

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The interactions between viral RNAs and coat proteins (CPs) are critical for the efficient completion of infection cycles of RNA viruses. However, the specificity of the interactions between CPs and genomic or subgenomic RNAs remains poorly understood. In this study, Bamboo mosaic virus (BaMV) was

The involvement of lipid peroxide-derived aldehydes in aluminum toxicity of tobacco roots.

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Oxidative injury of the root elongation zone is a primary event in aluminum (Al) toxicity in plants, but the injuring species remain unidentified. We verified the hypothesis that lipid peroxide-derived aldehydes, especially highly electrophilic alpha,beta-unsaturated aldehydes (2-alkenals),

Oxalate metabolism by tobacco leaf discs.

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The turnover rate of oxalate in leaf discs of Nicotiana tabacum, var Havana Seed, during photosynthesis was estimated to be 1 to 2 micromoles per gram fresh weight per hour. Radioactivity from the enzymic oxidation of [(14)C]oxalate rapidly appeared in neutral sugars (mainly sucrose), organic acids

A specific radioimmunoassay for nanogram quantities of the auxin, indole-3-acetic acid.

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We have developed a specific radioimmunoassay [RIA] for indole-3-acetic acid (IAA) in the 0.2 ng to 12 ng range which, in principle, can be extended to other indole auxins as well. Methods are presented for obtaining suitable antibody, for the RIA procedure, and for measuring IAA in methanolic

First Report of Cucumber mosaic virus in Teucrium fruticans.

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Teucrium fruticans (shrubby germander), family Lamiaceae, is a hardy shrub. Being drought tolerant, it is widespread in the Mediterranean area. Because it is readily propagated through cuttings, it is also planted in hedges. In 1997 and 2000, respectively, yellow chlorotic areas were observed on the

First Report of Cucumber mosaic virus in Helleborus foetidus in France and Italy.

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Helleborus foetidus L. (bear's foot) is a perennial plant from the family Ranunculaceae that is common in chalky soils of southern and western Europe. It is grown in gardens for its palm-shaped leaves and early flowers. In 1995, yellow-to-white oak leaf and line patterns in leaves of H. foetidus

[Expression of Mortierella isabellina delta6-fatty acid desaturase gene in gamma-linolenic acid production in transgenic tobacco].

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Gamma-linolenic acid (GLA, C18:3delta6.9.12) is nutritional and important polyunsaturated fatty acid in human and animal diets. GLA play an important role in hormone regulation and fatty acid metabolization. Furthermore it is also the biological precursor of a group of molecules, including

Biochemistry and cytochemical localization of acid phosphatase in the phloem of Nicotiana tabacum.

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A biochemical and cytochemical study has been made of the distribution of β-glycerophosphatase (EC 3.1.3.2) activity in mature and differentiating phloem cells of Nicotiana tabacum L. and the pH dependence and kinetics of β-glycerophosphate hydrolysis of homogenates of fresh leaf midveins and

[Transgenic plant regeneration of tobacco (Nicotiana tabacum) haboring mammalian cyp2e1 gene].

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CYP2E1 enzyme encoded by cyp2e1 gene plays an important role in metabolism of heterogeneous organics in mammalian liver cells. The transgenic plant with cyp2e1 can metabolize various low molecular weight organic pollutants. However, it is unclear the mechanism of expression control of cyp2e1 in

A biochemical and cytochemical study of adenosine triphosphatase activity in the phloem of Nicotiana tabacum.

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A biochemical and cytochemical study has been made of the distribution of ATPase in mature and differentiating phloem cells of Nicotiana tabacum and of the substrate specificity and effects of fixation on enzyme activity. Homogenates of unfixed leaf midveins and midveins fixed in

Evidence for the involvement of tetrahydrofolate in the demethylation of nicotine by Nicotiana plumbaginifolia cell-suspension cultures.

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The conversion of nicotine to nornicotine by Nicotiana plumbaginifolia Viv. cells was investigated by analysing the redistribution of label during feeding experiments with (R,S)-[2H- methyl]nicotine, (R,S)-[13C- methyl]nicotine and (R,S)-[14C- methyl]nicotine, and the results show that the N-methyl

Identification and functional characterization of regions that can be crosslinked to RNA in the helicase-like domain of BaMV replicase.

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The helicase-like domain of the Bamboo mosaic virus replicase catalyzes the release of 5'-gamma-phosphate from both ATP and 5'-triphosphated RNA by an identical set of catalytic residues with a presumably larger binding pocket for RNA. In this study, the peptidyl regions involved in RNA binding were

Cytoplasmic organelle DNA preferentially inserts into open chromatin.

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DNA transfer from chloroplasts and mitochondria to the nucleus is ongoing in eukaryotes but the mechanisms involved are poorly understood. Mitochondrial DNA was observed to integrate into the nuclear genome through DNA double-strand break repair in Nicotiana tabacum. Here, 14 nuclear insertions of

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