Journal
BIOCHEMICAL SYSTEMATICS AND ECOLOGY
Volume 37, Issue 3, Pages 139-145Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bse.2009.02.003
Keywords
Quaking aspen; Populus tremuloides; Aspen shoot blight; Venturia moreletii; Resistance; Phytochemistry; Genetic variation
Funding
- National Science Foundation [DEB-0074427, FIBR-0425908]
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Quaking aspen (Populus tremuloides) is a foundation tree species in North American forests, as well as a valuable source of wood and paper products. Quaking aspen exhibits substantial genetic variation within and among natural populations in phytochemical compounds that influence both interactions with herbivores and ecosystem dynamics. The potential association of these phytochemicals with disease resistance, however, is unknown. Here we present the results of a natural experiment in a common garden of quaking aspen genotypes infected with shoot blight (Venturia moreletii). We found that the incidence of shoot blight varied by 10-fold among aspen genotypes, and was strongly and negatively correlated with constitutive foliar concentrations of condensed tannins. Selection factors that shape the genetic and phytochemical architecture of aspen populations may thus Simultaneously influence aspen resistance to pathogen attack, with consequences for individual tree fitness as well as community organization, via extended phenotype effects. (C) 2009 Elsevier Ltd. All rights reserved.
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