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Spatial Organization of the Glucosinolate-Myrosinase System in Brassica Specialist Aphids Is Similar to That of the Host Plant
Matthew Bridges, Alexandra M. E. Jones, Atle M. Bones, Chris Hodgson, Rosemary Cole, Elspeth Bartlet, Roger Wallsgrove, Vassiliki K. Karapapa, Nigel Watts and John T. Rossiter
Proceedings: Biological Sciences
Vol. 269, No. 1487 (Jan. 22, 2002), pp. 187-191
Published by: Royal Society
Stable URL: http://www.jstor.org/stable/3067952
Page Count: 5
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Secondary metabolites are important in plant defence against pests and diseases. Similarly, insects can use plant secondary metabolites in defence and, in some cases, synthesize their own products. The paper describes how two specialist brassica feeders, Brevicoryne brassicae (cabbage aphid) and Lipaphis erysimi (turnip aphid) can sequester glucosinolates (thioglucosides) from their host plants, yet avoid the generation of toxic degradation products by compartmentalizing myrosinase (thioglucosidase) into crystalline microbodies. We propose that death, or damage, to the insect by predators or disease causes disruption of compartmentalized myrosinase, which results in the release of isothiocyanate that acts as a synergist for the alarm pheromone E-β-farnesene.
Proceedings: Biological Sciences © 2002 Royal Society