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Entomologia Experimentalis et Applicata 96: 3949, 2000. 2000 Kluwer Academic Publishers. Printed in the Netherlands.
 

Summary: Entomologia Experimentalis et Applicata 96: 3949, 2000.
2000 Kluwer Academic Publishers. Printed in the Netherlands.
39
Specificity of constitutive and induced resistance: pigment glands
influence mites and caterpillars on cotton plants
Anurag A. Agrawal & Richard Karban
Department of Entomology and Center for Population Biology, One Shields Avenue, University of California at
Davis, Davis, CA 95616-8584, USA; Current address: Department of Botany, University of Toronto, 25 Willcocks
Street, Toronto, ON, Canada M5S 3B2 (E-mail: agrawal@botany.utoronto.ca)
Accepted: March 2, 2000
Key words: Density-dependent induction, genotype-by-environment interaction, pigment glands, herbivory,
induced plant defense, plant-insect interactions, plasticity
Abstract
Cotton plants contain suites of phytochemicals thought to be important in defense against herbivores, some of
which are localized in pigment glands which contain gossypol and other terpenoid aldehydes. The simple genetic
basis for the expression of these glands has led to the development of near-isogenic glanded and glandless geno-
types. Glands may also be phenotypically induced by herbivory. We determined the consequences of constitutive
and induced gland expression on two types of herbivores, spider mites (cell content feeders) and noctuid caterpillars
(leaf chewers).
Induction of glands was strongly dependent on the density of attackers. Spider mite herbivory on cotyledons

  

Source: Agrawal, Anurag - Department of Ecology and Evolutionary Biology & Entomollogy, Cornell University

 

Collections: Environmental Sciences and Ecology