Oecologia

, Volume 154, Issue 4, pp 725–730 | Cite as

Foliar oxidases as mediators of the rapidly induced resistance of mountain birch against Epirrita autumnata

  • Teija Ruuhola
  • Shiyong Yang
  • Vladimir Ossipov
  • Erkki Haukioja
Plant Animal Interactions - Original Paper

Abstract

Induced resistance of the mountain birch against its main defoliator Epirrita autumnata is a well-characterized phenomenon. The causal mechanism for this induced deterioration, however, has not been unequivocally explained, and no individual compound or group of traditional defensive compounds has been shown to explain the phenomenon. Phenolic compounds are the main secondary metabolites in mountain birch leaves, and the biological activity of phenolics usually depends on their oxidation. In this study, we found that the activity of polyphenoloxidases (PPOs), enzymes that oxidize o-diphenols to o-diquinones, was induced in trees with introduced larvae, and bioassays showed that both growth and consumption rates of larvae were reduced in damaged trees. PPO activity was negatively associated with both larval growth and consumption rates in trees with bagged larvae, but not in control trees. Our results suggest that the oxidation of phenolics by PPOs may be a causal explanation for the rapidly induced resistance of mountain birch against E. autumnata. This finding also helps to explain why correlations between insect performance and phenolics (without measuring indices explaining their oxidation) may not produce consistent results.

Keywords

Autumnal moth Deciduous tree Defence Herbivory Polyphenoloxidase 

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Teija Ruuhola
    • 1
  • Shiyong Yang
    • 1
  • Vladimir Ossipov
    • 2
  • Erkki Haukioja
    • 1
  1. 1.Section of Ecology, Department of BiologyUniversity of TurkuTurkuFinland
  2. 2.Laboratory of Physical ChemistryUniversity of TurkuTurkuFinland

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