Journal of Chemical Ecology

, Volume 19, Issue 3, pp 581–599 | Cite as

Herbivory induces systemic production of plant volatiles that attract predators of the herbivore: Extraction of endogenous elicitor

  • Marcel Dicke
  • Peter Van Baarlen
  • Rob Wessels
  • Herman Dijkman
Article

Abstract

It was previously shown that in response to infestation by spider mites (Tetranychus urticae), lima bean plants produce a volatile herbivoreinduced synomone that attracts phytoseiid mites (Phytoseiulus persimilis) that are predators of the spider mites. The production of predator-attracting infochemicals was established to occur systemically throughout the spider mitein-fested plant. Here we describe the extraction of a water-soluble endogenous elicitor from spider mite-infested lima bean leaves. This elicitor was shown to be transported out of infested leaves and was collected in water in which the petiole of the infested leaf was placed. When the petioles of uninfested lima bean leaves were placed in water in which infested leaves had been present for the previous seven days, these uninfested lima bean leaves became highly attractive to predatory mites in an olfactometer when an appropriate control of uninfested lima bean leaves was offered as alternative. The strength of this effect was dependent on the number of spider mites infesting the elicitor-producing leaves. Higher numbers of spider mites resulted in an elicitor solution with a stronger effect. In addition, spider mite density was important. The elicitor obtained from one leaf with 50 spider mites had a stronger effect on the attractiveness of uninfested leaves than the elicitor obtained from three leaves with 17 spider mites each. This suggests that the stress intensity imposed on a plant is an important determinant of the elicitor quantity. While the elicitor has a strong effect on the attractiveness of uninfested leaves, spider mite-infested leaves are still much more attractive to predatory mites than elicitor-exposed leaves. The data are discussed in the context of systemic effects in plant defense and the biosynthesis of herbivore-induced terpenoids in plants.

Key Words

Plant defense systemic effect endogenous elicitor herbivore-induced synomone Acari spider mites Tetranychus urticae predatory mites Phytoseiulus persimilis lima bean Phaseolus lunatus olfactometer tritrophic interactions 

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Copyright information

© Plenum Publishing Corporation 1993

Authors and Affiliations

  • Marcel Dicke
    • 1
  • Peter Van Baarlen
    • 1
  • Rob Wessels
    • 1
  • Herman Dijkman
    • 1
  1. 1.Department of EntomologyWageningen Agricultural UniversityWageningenThe Netherlands

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