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  • 1
    Electronic Resource
    Electronic Resource
    Effect of Light on Cell Division in Plant Tissue Cultures (1967)
    [s.l.] : Nature Publishing Group
    Nature 215 (1967), S. 873-873 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Observations1?3 have shown the course of change in cell number with time in explants taken from tubers of the Jerusalem artichoke and cultured in contact with a medium containing 20 per cent coconut milk and 10?6 molar, 2,4-dichlorophenoxyacetic acid. It has also been shown2,3 that the first few ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/215873a0
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  • 2
    Electronic Resource
    Electronic Resource
    Ribosomal RNA integrity and rate of seed germination (1980)
    Springer
    Planta 148 (1980), S. 417-421 
    Details
    ISSN: 1432-2048
    Keywords: Daucus ; Germination (seeds) ; Nicotinana ; rRNA ; Seed ageing ; Seed germination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The integrity of ribosomal RNA (the percentage of complete, un-nicked molecules) in seeds was studied by electrophoresis under denaturing conditions. Two batches of carrot seed, harvested at different stages of maturity, and four batches ofNicotiana seed stored for various times were used. Within each species, there was a correlation between the integrity of the rRNA of the dry seed and the rate of germination of that seed. In carrot seed, there was extensive degradation of existing rRNA in both the embryo and endosperm during the first two days of imbibition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02395308
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  • 3
    Electronic Resource
    Electronic Resource
    Stimulation by abscisic acid of RNA synthesis in discs from healthy and tobacco mosaic virus-infected tobacco leaves (1980)
    Springer
    Planta 150 (1980), S. 349-353 
    Details
    ISSN: 1432-2048
    Keywords: Abscisic acid ; Nicotiana ; Ribonucleic acid synthesis ; Tobacco mosaic virus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Uptake of abscisic acid from the culture medium by discs of healthy and tobacco mosaic virus-infected tobacco leaves was measured. Small (two to five-fold) increases in abscisic acid concentration in discs caused increases in rates of [3H]uridine and [3H]adenine incorporation into total nucleic acid, virus RNA and host ribosomal RNA. Net accumulation of virus RNA was also enhanced by abscisic acid. This evidence for stimulation of RNA synthesis is compared with previous reports showing inhibition of RNA synthesis in other tissues. It is suggested that the increase in endogenous abscisic acid caused by tobacco mosaic virus infection may be at least partly responsible for observed increases in rates of RNA synthesis after infection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390168
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  • 4
    Electronic Resource
    Electronic Resource
    Ribosomal RNA integrity and rate of seed germination (1980)
    Springer
    Planta 148 (1980), S. 417-421 
    Details
    ISSN: 1432-2048
    Keywords: Daucus ; Germination (seeds) ; Nicotinana ; rRNA ; Seed ageing ; Seed germination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The integrity of ribosomal RNA (the percentage of complete, un-nicked molecules) in seeds was studied by electrophoresis under denaturing conditions. Two batches of carrot seed, harvested at different stages of maturity, and four batches ofNicotiana seed stored for various times were used. Within each species, there was a correlation between the integrity of the rRNA of the dry seed and the rate of germination of that seed. In carrot seed, there was extensive degradation of existing rRNA in both the embryo and endosperm during the first two days of imbibition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00552653
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  • 5
    Electronic Resource
    Electronic Resource
    Plant growth regulators and virus infection: A critical review (1982)
    Springer
    Plant growth regulation 1 (1982), S. 37-59 
    Details
    ISSN: 1573-5087
    Keywords: Plant growth regulators ; plant virus infection ; control of host-virus interaction ; resistance to virus disease ; chemotherapy of virus disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Virus infection can severely inhibit plant growth and distort development. This article reviews changes in plant growth regulator metabolism caused by infection. In general, virus infection decreases auxin and gibberellin concentrations and increases abscisic acid concentration. Ethylene production is stimulated in necrotic or chlorotic reactions to infection, but not where the virus spreads systemically without necrosis. While these broad trends are true for most host-virus combinations studied, several situations are recorded where the virus had other effects on growth substance concentration. Cytokinin changes do not show any common pattern: both increases and decreases after infection have been reported. The extent to which virus-induced changes in growth substance concentration could be responsible for observed alterations in host growth and development is discussed. While changes in abscisic acid, gibberellin and ethylene production seem potentially important, the experimental evidence does not provide conclusive proof for control of growth by these changes. The numerous investigations of effects of exogenous regulators on virus multiplication and pathogenesis are reviewed. Different regulators, or the same regulator applied at different times or concentrations, had very diverse effects, and in some cases did significantly alter virus multiplication and pathogenesis. However, such studies seem to have yielded disappointingly little understanding of the biochemistry of the host-virus interaction, and the possible involvement of growth substances in this. Possible uses of plant growth regulators in chemotherapy of virus disease, and their possible involvement in natural or induced resistance mechanisms are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024221
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of two TMV strains on the synthesis and stability of chloroplast ribosomal RNA in tobacco leaves (1969)
    Springer
    Molecular genetics and genomics 106 (1969), S. 73-79 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Multiplication of TMV-strains vulgare (light-green/dark-green mosaic symptoms) and flavum (severe yellow/green mosaic) had different effects on the ribosomal RNA of tobacco leaf chloroplasts. Vulgare inhibited chloroplast ribosomal RNA synthesis while having no effect on cytoplasmic ribosomal RNA synthesis (Fig. 2). Flavum inhibited chloroplast ribosomal RNA synthesis more severely than vulgare, and caused an earlier degradation of chloroplast ribosomal RNA than in control or vulgare-infected leaves (Fig. 1). Flavum also inhibited cytoplasmic ribosomal RNA synthesis. A connection between these differing effects on chloroplast ribosomal RNA metabolism and severity of visible symptoms is suggested, and discussed in relation to a possible influence on symptoms of denatured virus coat protein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332822
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  • 7
    Electronic Resource
    Electronic Resource
    Pathogenesis-related proteins and acquired systemic resistance: Causal relationship or separate effects? (1983)
    Springer
    European journal of plant pathology 89 (1983), S. 283-292 
    Details
    ISSN: 1573-8469
    Keywords: Nicotiana tabacum ; N-gene ; hypersensitivity ; local lesions ; virus localization ; electron microscopy ; myelinic bodies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract This paper questions whether pathogenesis-related proteins (PRs) have any role in acquired systemic resistance, and whether there may be alternative explanations for the reduced number and size of lesions formed when leaves containing PRs are inoculated with virus. It is concluded that PRs may not play a direct role in acquired resistance; that altered lesion number may result from altered susceptibility of the leaf to mechanical inoculation, and that reduced lesion size could reflect a non-specific modulation of the basic localization mechanism. Preliminary experiments showing changes in ultrastructure of leaves associated with the development of acquired systemic resistance are discussed. The most striking change was development of myelinic bodies, generally between the cell wall and plasmalemma in uninoculated areas of leaf opposite halves bearing lesions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01995263
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  • 8
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    Stimulation by abscisic acid of RNA synthesis in discs from healthy and tobacco mosaic virus-infected tobacco leaves (1980)
    Springer
    Details
    Publication Date: 1980-12-01
    Print ISSN: 0032-0935
    Electronic ISSN: 1432-2048
    Topics: Biology
    Published by Springer
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  • 9
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    Ribosomal RNA integrity and rate of seed germination (1980)
    Springer
    Details
    Publication Date: 1980-06-01
    Print ISSN: 0032-0935
    Electronic ISSN: 1432-2048
    Topics: Biology
    Published by Springer
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  • 10
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    Characterization of tropospheric desert aerosols at solar wavelengths by multispectral radiometry from Landsat (1982)
    American Geophysical Union
    Details
    Publication Date: 1982-01-01
    Print ISSN: 0148-0227
    Electronic ISSN: 2156-2202
    Topics: Geosciences
    Published by American Geophysical Union
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