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2002 The Society for the Study of Evolution. All rights reserved. Evolution, 56(11), 2002, pp. 22062213
 

Summary: 2206
2002 The Society for the Study of Evolution. All rights reserved.
Evolution, 56(11), 2002, pp. 22062213
ECOLOGICAL GENETICS OF AN INDUCED PLANT DEFENSE AGAINST HERBIVORES:
ADDITIVE GENETIC VARIANCE AND COSTS OF PHENOTYPIC PLASTICITY
ANURAG A. AGRAWAL,1,2 JEFFREY K. CONNER,3 MARC T. J. JOHNSON,1 AND ROGER WALLSGROVE4
1Department of Botany, 25 Willcocks Street, University of Toronto, Toronto, Ontario M5S 3B2, Canada
2E-mail: agrawal@botany.utoronto.ca
3W. K. Kellogg Biological Station and Department of Plant Biology, Michigan State University,
Hickory Corners, Michigan 49060
4Institute of Arable Crops Research-Rothamsted, Harpenden, Herts AL5 2JQ, United Kingdom
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 phe-
nology, 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

  

Source: Agrawal, Anurag - Department of Ecology and Evolutionary Biology & Entomollogy, Cornell University
Johnson, Marc - Department of Plant Biology, North Carolina State University

 

Collections: Biology and Medicine; Environmental Sciences and Ecology