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

Content Provider	Springer Nature Link
Author	Ruuhola, Teija Yang, Shiyong Ossipov, Vladimir Haukioja, Erkki
Copyright Year	2007
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.
Starting Page	725
Ending Page	730
Page Count	6
File Format	PDF
ISSN	00298549
Journal	Oecologia
Volume Number	154
Issue Number	4
e-ISSN	14321939
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-10-21
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Autumnal moth Deciduous tree Defence Herbivory Polyphenoloxidase Plant Sciences Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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Temporal and spatial variation in mountain birch foliar enzyme activities during the larval period of Epirrita autumnata

Immunological Memory of Mountain Birches: Effects of Phenolics on Performance of the Autumnal Moth Depend on Herbivory History of Trees

Larval parasitism of the autumnal moth reduces feeding intensity on the mountain birch

Performance of the cyclic autumnal moth, Epirrita autumnata, in relation to birch mast seeding

Reduction in size and fecundity of the autumnal moth, Epirrita autumnata, in the increase phase of a population cycle

Increase in the substrate availability decreases phenoloxidase activity in the autumnal moth, Epirrita autumnata

Population cycles of autumnal moth, Epirrita autumnata, in relation to birch mast seeding

Boron Fertilization Enhances the Induced Defense of Silver Birch

Deep sympatric mtDNA divergence in the autumnal moth (Epirrita autumnata)

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

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