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Strana 1 z 117 Výsledek
Cytokinins in Vinca rosea L. Crown Gall Tumor Tissue as Influenced by Compounds Containing Reduced Nitrogen.
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Several compounds containing reduced nitrogen markedly increased the yields of cell-division compounds extractable from an A6 Vinca rosea L. crown gall tumor tissue. Casein hydrolysate, several amino acids, and ammonium salts were effective. Both trans-zeatin and ribosyl-trans-zeatin were
[Radiorestoration by 3 cytokinins contained in yeast RNAs and extracts, of scorzonera tumor tissues exposed to cobalt-60 gamma rays].
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The 3 natural cytokinins contained both in the extracts and RNA of yeast and the tumor tissues cultivated in vitro, elicit radiorestorative properties from the crown-gall tissues of Scorsonera submitted to Co60 gamma-rays. However the cytokinins produce no stimulating effect whatsoever on the non
Mass-spectrometric quantitation of cytokinins in tobacco crown-gall tumours induced by mutated octopine Ti plasmids of Agrobacterium tumefaciens.
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The levels of the major cytokinins, zeatin, zeatin riboside, zeatin riboside-5'-monophosphate and zeatin-7-glucoside were measured in tobacco (Nicotiana tabacum L.) crown-gall tissues carrying insertion and deletion mutations in the T-DNA. Measurements were made by combined gas chromatography-mass
In situ localization of endogenous cytokinins during shooty tumor development on Eucalyptus globulus Labill.
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Our previous results demonstrated that endogenous cytokinins are involved in the shooty potential of tumors initiated on Eucalyptus globulus plantlets inoculated with Agrobacterium tumefaciens strain 82.139 [A. Azmi et al. (1997a) Plant Sci 127: 81-90]. In order to investigate whether or not these
Dynamics of Endogenous Cytokinins during the Growth Cycle of a Hormone-Autotrophic Genetic Tumor Line of Tobacco.
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The profile of endogenous cytokinins in a genetic tumor line of tobacco, namely, Nicotiana glauca (Grah.) x Nicotiana langsdorffii (Weinm.), following 1 to 10 weeks of growth on solid medium was determined by radioimmunoassay. (3)H-labeled cytokinins of high specific activity were added during
Cytokinin/auxin balance in crown gall tumors is regulated by specific loci in the T-DNA.
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Insertion of the transposon Tn5 into the T-region of the octopine Ti plasmid of Agrobacterium tumefaciens gives rise to crown gall tumors having altered morphology. Three loci within the T-DNA that control tumor morphology have been detected [Garfinkel, D. J., Simpson, R. B., Ream, L. W., White, F.
A cDNA from pea petals with sequence similarity to pollen allergen, cytokinin-induced and genetic tumour-specific genes: identification of a new family of related sequences.
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A cDNA isolated from pea petals exhibits extensive similarity to pollen allergen genes, a cytokinin-regulated cDNA from soybean suspension cultures, a partial cDNA preferentially expressed in tobacco genetic tumours, four Arabidopsis expressed sequence tags (ESTs) and fifteen rice ESTs. This diverse
[Immunotherapy of cancer using cytokinins. Use and perspectives in lung oncology].
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Progress in genetics now enables the synthesis of molecules acting on the regulation of the immune system which are called cytokines. Currently there are several cytokines, Interferon (IFN), Interleukin 2 (IL2), tumour necrosis factor (TNF) as well as haematopoietic growth factors and these are the
Ribosyl-trans-Zeatin, A Major Cytokinin Produced by Crown Gall Tumor Tissue.
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A cell division factor in crystalline form has been isolated from ethanolic extracts of cultured Vinca rosea L. crown gall tumor tissue. The crystalline material shows the melting point, mass spectrum, ultraviolet-light absorbancy spectra, solubilities, chromatographic migration values, ion-exchange
Tumour genes in plants: T-DNA encoded cytokinin biosynthesis.
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Gene 4 from the T-region of Ti plasmids is responsible for cytokinin effects in crown gall cells; we investigated whether it codes for an enzyme of hormone biosynthesis. In a first set of experiments, gene 4 from octopine plasmid pTiAch5 and nopaline plasmid pTiC58 was expressed in Escherichia coli,
Cytokinins in tobacco crown gall tumors.
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Initiation of spontaneous tumors in radish (Raphanus sativus): Cellular, molecular and physiological events.
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In plant meristems, the balance of cell proliferation and differentiation is maintained by phytohormones, specifically auxin and cytokinin, as well as transcription factors. Changing of the cytokinin/auxin balance in plants may lead to developmental abnormalities, and in particular, to the formation
Anatomy of shoots and tumors of in vitro habituated Rhododendron 'Montego' (Ericaceae) cultures with tissue proliferation.
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Tissue proliferation (TP) is characterized primarily by the formation of galls or tumors at the crown of container-grown rhododendrons that were initially propagated in vitro. In the cultivar 'Montego', TP-like symptoms are first observed in vitro as shoot clusters with small leaves and nodal
Ectopic localization of auxin and cytokinin in tobacco seedlings by the plant-oncogenic AK-6b gene of Agrobacterium tumefaciens AKE10.
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The oncogenic 6b gene of Agrobacterium tumefaciens induces a number of morphological and metabolic alterations in plants. Although molecular functions associated with the 6b genes have been proposed, including auxin transport, sugar transport, transcriptional regulation, and miRNA metabolism, so far
[Meristematic characteristics of tumors initiated by Agrobacterium tumefaciens in pea plants].
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It is known that two key groups of plant hormones--auxins and cytokinins--play an important role in plant tumor development. The formation of Agrobacterium-induced tumors results from the horizontal transfer of bacterial oncogenes involved in the biosynthesis of these hormones in the plant genome.
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