Separating ontogenetic and environmental determination of resistance to herbivory in cottonwood

Liza M. Holeski, Michael J.C. Kearsley, Thomas G. Whitham

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

We used narrowleaf cottonwood, Populus angustifolia, and the gall-forming aphid, Pemphigus betae, to determine the extent to which ontogenetic variation in resistance to herbivory is due to endogenous, stable genetic influences. In a three-year common garden trial using ramets propagated from the top, middle, and bottom of mature trees, we found that the resistance of trees to aphids was significantly higher in top vs. bottom source ramets, supporting the hypothesis of a stable, genetically programmed component to aphid resistance. The magnitude of ontogenetically based variation in resistance within an individual tree is comparable to the genetic variation in resistance among narrowleaf cottonwood genotypes or populations found in other studies. These ontogenetic-based findings have the potential to alter ecological interactions and evolutionary trajectories of plant - herbivore interactions.

Original languageEnglish (US)
Pages (from-to)2969-2973
Number of pages5
JournalEcology
Volume90
Issue number11
DOIs
StatePublished - Nov 1 2009

Keywords

  • Development
  • Environment
  • Genetic
  • Herbivory
  • Ontogeny of resistance
  • Pemphigus betae
  • Populus

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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