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  • 1
    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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  • 2
    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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    Paper (German National Licenses)
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