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Journal of Chemical Ecology, Vol. 29, No. 6, June 2003 (C 2003) A ROLE FOR ISOTHIOCYANATES IN PLANT RESISTANCE
 

Summary: Journal of Chemical Ecology, Vol. 29, No. 6, June 2003 (C 2003)
A ROLE FOR ISOTHIOCYANATES IN PLANT RESISTANCE
AGAINST THE SPECIALIST HERBIVORE Pieris rapae
ANURAG A. AGRAWAL1,
and NILE S. KURASHIGE1
1Department of Botany
University of Toronto
25 Willcocks Street
Toronto, Ontario M5S 3B2, Canada
(Received September 11, 2002; accepted February 13, 2003)
Abstract--We experimentally reanalyzed the classic interaction between Pieris
rapae, a specialist lepidopteran herbivore, and isothiocyanates (mustard oils)
that are characteristic phytochemicals of the Brassicaceae. Previous investi-
gations have suggested that P. rapae is unaffected by isothiocyanates. Using
whole plants, root extracts, and a microencapsulated formulation of allyl isothio-
cyanate,wenowshowthatisothiocyanatesreduceherbivoresurvivalandgrowth,
and increase development time, each in a dose-dependent manner. Neither the
substrate allyl glucosinolate, nor myrosinase, the enzyme that results in the
breakdown of glucosinolates, negatively affected P. rapae. Thus, we present
strong evidence for a role for isothiocyanates in plant resistance against the

  

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

 

Collections: Environmental Sciences and Ecology