What makes a volatile organic compound a reliable indicator of insect herbivory?

Jacob C. Douma*, Laurens N. Ganzeveld, Sybille B. Unsicker, Andreas Boeckler, Marcel Dicke

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

7 Citations (Scopus)

Abstract

Plants that are subject to insect herbivory emit a blend of so-called herbivore-induced plant volatiles (HIPVs), of which only a few serve as cues for the carnivorous enemies to locate their host. We lack understanding which HIPVs are reliable indicators of insect herbivory. Here, we take a modelling approach to elucidate which physicochemical and physiological properties contribute to the information value of a HIPV. A leaf-level HIPV synthesis and emission model is developed and parameterized to poplar. Next, HIPV concentrations within the canopy are inferred as a function of dispersion, transport and chemical degradation of the compounds. We show that the ability of HIPVs to reveal herbivory varies from almost perfect to no better than chance and interacts with canopy conditions. Model predictions matched well with leaf-emission measurements and field and laboratory assays. The chemical class a compound belongs to predicted the signalling ability of a compound only to a minor extent, whereas compound characteristics such as its reaction rate with atmospheric oxidants, biosynthesis rate upon herbivory and volatility were much more important predictors. This study shows the power of merging fields of plant–insect interactions and atmospheric chemistry research to increase our understanding of the ecological significance of HIPVs.

Original languageEnglish
Pages (from-to)3308-3325
JournalPlant Cell and Environment
Volume42
Issue number12
Early online date22 Jul 2019
DOIs
Publication statusPublished - 22 Jul 2019

Keywords

  • biogenic volatile organic compound (BVOC)
  • emission
  • herbivore induced plant volatile (HIPV)
  • hydroxyl radical
  • nitrate radical
  • oxidation
  • ozone
  • Populus nigra

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