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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Macmillan Magazines Ltd.
    Nature 399 (1999), S. 686-688 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In many plants, defence systems against herbivores are induced through the octadecanoid pathway,, which may also be involved in recruiting natural enemies of herbivores. This pathway can beinduced by treating plants with jasmonic acid or by natural herbivory, and increases resistance against ...
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of chemical ecology 25 (1999), S. 1597-1609 
    ISSN: 1573-1561
    Keywords: Benzothiadiazole ; salicylic acid ; jasmonic acid ; defense signaling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Two signaling pathways, one involving salicylic acid and another involving jasmonic acid, participate in the expression of plant resistance to pathogens and insect herbivores. In this study, we report that stimulation of systemic acquired resistance in field-grown tomato plants with the salicylate mimic, benzothiadiazole: (1) attenuates the jasmonate-induced expression of the antiherbivore defense-related enzyme polyphenol oxidase, and (2) compromises host-plant resistance to larvae of the beet armyworm, Spodoptera exigua. Conversely, treatment of plants with jasmonic acid at concentrations that induce resistance to insects reduces pathogenesis-related protein gene expression induced by benzothiadiazole, and partially reverses the protective effect of benzothiadiazole against bacterial speck disease caused by Pseudomonas syringae pv. tomato. We conclude that effective utilization of induced plant resistance to the multiple pests typically encountered in agriculture will require understanding potential signaling conflicts in plant defense responses.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of chemical ecology 22 (1996), S. 1767-1781 
    ISSN: 1573-1561
    Keywords: Jasmonic acid ; methyl jasmonate ; induced phytochemistry ; induced resistance ; polyphenol oxidase ; peroxidase ; lipoxygenase ; proteinase inhibitors ; Helicoverpa zea ; Spodoptera exigua
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Wounding increases the levels and activities of several defense-related proteins in the foliage of the tomato plant,Lycopersicon esculentum Mill. Evidence indicates that two of these responses, the systemic increases in polyphenol oxidase and proteinase inhibitors, are regulated by an octadecanoid-based signalling pathway which includes the wound hormone, jasmonic acid. It is not known whether other responses to wounding are also regulated by this same signalling pathway. In this paper, we show that application of jasmonates (jasmonic acid or its volatile derivative, methyl jasmonate) in low concentrations to foliage of young tomato plants induced, in a dose-dependent manner, the same protein responses-polyphenol oxidase, proteinase inhibitors, lipoxygenase, and peroxidase-as doesHelicoverpa zea Boddie feeding. Application of jasmonic acid to a single leaflet of four-leaf tomato plants induced these four proteins in a spatial pattern nearly identical to that produced by localized feeding ofH. zea. Exogenous jasmonic acid also decreased suitability of foliage for the beet armyworm,Spodoptera exigua Hubner in the laboratory. Based on these results, we conducted an experiment to measure the effects of jasmonic acid spray under field conditions. We provide the first evidence that jasmonic acid spray on field plants induces production of chemical defenses above the levels found in unsprayed controls. Exogenous jasmonic acid sprayed on plants in agricultural plots increased levels of polyphenol oxidase and proteinase inhibitors. Because application of jasmonic acid induces these defensive compounds at low concentrations in a manner similar to natural wounding, it may prove to be a useful tool for stimulating plant resistance to insects in the field.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Entomology 51 (2006), S. 663-689 
    ISSN: 0066-4170
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Notes: Plant-mediated interactions between pathogenic microorganisms and arthropod herbivores occur when arthropod infestation or pathogen infection changes the shared host plant in ways that affect a subsequent attacker of the opposite type. Interest in such "tripartite" interactions has increased as the ecological and plant physiological framework for understanding and contextualizing them has developed. The outcomes of plant-mediated interactions are variable, and only a few provisional patterns can be identified at present. However, these interactions can have important consequences not only for individual pathogens and herbivores, but also for the population dynamics of both types of organisms in managed and natural ecosystems. Research has focused on the role of two plant response pathways in mediating tripartite interactions, one involving jasmonic acid and the other salicylic acid. Further studies of plant-mediated interactions will facilitate an understanding of how plants coordinate and integrate their defenses against multiple biotic threats.
    Type of Medium: Electronic Resource
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