NDLI: Interactive Effects of Genotype, Environment, and Ontogeny on Resistance of Cucumber (Cucumis sativus) to the Generalist Herbivore, Spodoptera exigua

Content Provider	Springer Nature Link
Author	Barrett, Rowan D. H. Agrawal, Anurag A.
Copyright Year	2004
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 cucumber 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, however, on undamaged plants compared to damaged plants, and 59% higher on true leaves compared to cotyledons. Moreover, all two-way interaction terms between genotype, environment, and ontogeny were significant. For example, S. exigua performance was higher on bitter than on sweet plants; however, this effect was strongly influenced by whether the tissue consumed was a cotyledon or true leaf and also whether it had been previously damaged. An examination of leaf nutritional chemistry revealed that some of our results could be explained by genotypic, environmental, and ontogenic differences in foliar nitrogen content. In contrast, the cucurbitacin content of plants did not appear to affect caterpillar growth. Our results provide evidence for the importance of interactions between genotype, environment, and ontogeny in determining herbivory and illustrate the value of manipulative experiments in revealing the complexities of these interactions.
Starting Page	37
Ending Page	51
Page Count	15
File Format	PDF
ISSN	00980331
Journal	Journal of Chemical Ecology
Volume Number	30
Issue Number	1
e-ISSN	15731561
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2004-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physical Chemistry Agriculture Ecology Biological Microscopy
Content Type	Text
Resource Type	Article
Subject	Medicine Biochemistry Ecology, Evolution, Behavior and Systematics

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