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Journal of Chemical Ecology, Vol. 30, No. 1, January 2004 (C 2004) INTERACTIVE EFFECTS OF GENOTYPE, ENVIRONMENT,
 

Summary: Journal of Chemical Ecology, Vol. 30, No. 1, January 2004 (C 2004)
INTERACTIVE EFFECTS OF GENOTYPE, ENVIRONMENT,
AND ONTOGENY ON RESISTANCE OF CUCUMBER
(Cucumis sativus) TO THE GENERALIST HERBIVORE,
Spodoptera exigua
ROWAN D. H. BARRETT1,2
and ANURAG A. AGRAWAL1,
1Department of Botany, University of Toronto
Toronto, Ontario M5S 3B2, Canada
(Received February 21, 2003; accepted September 10, 2003)
Abstract--Host-plant genotype, environment, and ontogeny all play a role in
determining plant resistance to herbivory, yet little is known about the nature
of the interactions among these factors. We investigated resistance of cucum-
ber plants Cucumis sativus to the generalist herbivore Spodoptera exigua in
a manipulative experiment involving three factors. In particular, we tested the
effects of bitter (cucurbitacins present) vs. sweet (cucurbitacins absent) plants
(genotype), with or without previous herbivory (environment), and cotyledons
vs. true leaves (ontogeny). Contrary to our expectations, S. exigua growth was
54% higher on bitter plants than on sweet plants; growth was 63% higher, how-
ever, on undamaged plants compared to damaged plants, and 59% higher on

  

Source: Agrawal, Anurag - Department of Ecology and Evolutionary Biology & Entomollogy, Cornell University
Barrett, Rowan D.H. - Department of Organismic and Evolutionary Biology, Harvard University

 

Collections: Biology and Medicine; Environmental Sciences and Ecology