Ecological genetics of an induced plant defense against herbivores: additive genetic variance and costs of phenotypic plasticity

A - Papers appearing in refereed journals

Agrawal, A. A., Conner, J. K., Johnson, M. T. J. and Wallsgrove, R. M. 2002. Ecological genetics of an induced plant defense against herbivores: additive genetic variance and costs of phenotypic plasticity. Evolution. 56 (11), pp. 2206-2213. https://doi.org/10.1111/j.0014-3820.2002.tb00145.x

AuthorsAgrawal, A. A., Conner, J. K., Johnson, M. T. J. and Wallsgrove, R. M.
Abstract

Adaptive phenotypic plasticity in chemical defense is thought to play a major role in plant-herbivore interactions. We investigated genetic variation for inducibility of defensive traits in wild radish plants and asked if the evolution of induction is constrained by costs of phenotypic plasticity. In a greenhouse experiment using paternal half-sibling families, we show additive genetic variation for plasticity in glucosinolate concentration. Genetic variation for glucosinolates was not detected in undamaged plants, but was significant following herbivory by a specialist herbivore, Pieris rapae. On average, damaged plants had 55% higher concentrations of glucosinolates compared to controls. In addition, we found significant narrow-sense heritabilities for leaf size, trichome number, flowering phenology, and lifetime fruit production. In a second experiment, we found evidence of genetic variation in induced plant resistance to P. rapae. Although overall there was little evidence for genetic correlations between the defensive and life-history traits we measured, we show that more plastic families had lower fitness than less plastic families in the absence of herbivory (i.e., evidence for genetic costs of plasticity). Thus, there is genetic variation for induction of defense in wild radish, and the evolution of inducibility may be constrained by costs of plasticity.

KeywordsEcology; Evolutionary Biology; Genetics & Heredity
Year of Publication2002
JournalEvolution
Journal citation56 (11), pp. 2206-2213
Digital Object Identifier (DOI)https://doi.org/10.1111/j.0014-3820.2002.tb00145.x
PubMed ID12487351
Open accessPublished as bronze (free) open access
Funder project or code413
521
Publisher's version
PublisherWiley
ISSN0014-3820

Permalink - https://repository.rothamsted.ac.uk/item/88y2w/ecological-genetics-of-an-induced-plant-defense-against-herbivores-additive-genetic-variance-and-costs-of-phenotypic-plasticity

23 total views
70 total downloads
0 views this month
9 downloads this month
Download files as zip