Journal of Chemical Ecology

, Volume 36, Issue 4, pp 369–377

Induction of Phenolic Glycosides by Quaking Aspen (Populus tremuloides) Leaves in Relation to Extrafloral Nectaries and Epidermal Leaf Mining

  • Brian Young
  • Diane Wagner
  • Patricia Doak
  • Thomas Clausen
Article

DOI: 10.1007/s10886-010-9763-9

Cite this article as:
Young, B., Wagner, D., Doak, P. et al. J Chem Ecol (2010) 36: 369. doi:10.1007/s10886-010-9763-9

Abstract

We studied the effect of epidermal leaf mining on the leaf chemistry of quaking aspen, Populus tremuloides, during an outbreak of the aspen leaf miner, Phyllocnistis populiella, in the boreal forest of interior Alaska. Phyllocnistis populiella feeds on the epidermal cells of P. tremuloides leaves. Eleven days after the onset of leaf mining, concentrations of the phenolic glycosides tremulacin and salicortin were significantly higher in aspen leaves that had received natural levels of leaf mining than in leaves sprayed with insecticide to reduce mining damage. In a second experiment, we examined the time course of induction in more detail. The levels of foliar phenolic glycosides in naturally mined ramets increased relative to the levels in insecticide-treated ramets on the ninth day following the onset of leaf mining. Induction occurred while some leaf miner larvae were still feeding and when leaves had sustained mining over 5% of the leaf surface. Leaves with extrafloral nectaries (EFNs) had significantly higher constitutive and induced levels of phenolic glycosides than leaves lacking EFNs, but there was no difference in the ability of leaves with and without EFNs to induce phenolic glycosides in response to mining. Previous work showed that the extent of leaf mining damage was negatively related to the total foliar phenolic glycoside concentration, suggesting that phenolic glycosides deter or reduce mining damage. The results presented here demonstrate that induction of phenolic glycosides can be triggered by relatively small amounts of mining damage confined to the epidermal tissue, and that these changes in leaf chemistry occur while a subset of leaf miners are still feeding within the leaf.

Key Words

Populus tremuloidesPhyllocnistis populiellaEpidermal leaf miningInduced defensePhenolic glycosidesExtrafloral nectariesAlaska

Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Brian Young
    • 1
    • 3
  • Diane Wagner
    • 1
  • Patricia Doak
    • 1
  • Thomas Clausen
    • 2
  1. 1.Institute of Arctic Biology and Department of Biology & WildlifeUniversity of Alaska FairbanksFairbanksUSA
  2. 2.Department of Chemistry and BiochemistryUniversity of Alaska FairbanksFairbanksUSA
  3. 3.Department of Forest SciencesUniversity of Alaska FairbanksFairbanksUSA