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Induced Responses to Herbivory and Jasmonate in Three Milkweed Species

Summary: Induced Responses to Herbivory and Jasmonate in Three
Milkweed Species
Sergio Rasmann & M. Daisy Johnson &
Anurag A. Agrawal
Received: 20 August 2009 /Revised: 9 October 2009 /Accepted: 25 November 2009
# Springer Science+Business Media, LLC 2009
Abstract We studied constitutive and induced defensive
traits (latex exudation, cardenolides, proteases, and C/N
ratio) and resistance to monarch caterpillars (Danaus
plexippus) in three closely related milkweed species
(Asclepias angustifolia, A. barjoniifolia and A. fascicularis).
All traits showed significant induction in at least one of the
species. Jasmonate application only partially mimicked the
effect of monarch feeding. We found some correspondence
between latex and cardenolide content and reduced larval
growth. Larvae fed cut leaves of A. angustifolia grew better
than larvae fed intact plants. Addition of the cardenolide
digitoxin to cut leaves reduced larval growth but ouabain (at
the same concentration) had no effect. We, thus, confirm that
latex and cardenolides are major defenses in milkweeds,


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


Collections: Environmental Sciences and Ecology