Analysis of volatiles induced by oviposition of elm leaf beetle Xanthogaleruca luteola on Ulmus minor

Citation
R. Wegener et al., Analysis of volatiles induced by oviposition of elm leaf beetle Xanthogaleruca luteola on Ulmus minor, J CHEM ECOL, 27(3), 2001, pp. 499-515
Citations number
36
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
JOURNAL OF CHEMICAL ECOLOGY
ISSN journal
0098-0331 → ACNP
Volume
27
Issue
3
Year of publication
2001
Pages
499 - 515
Database
ISI
SICI code
0098-0331(200103)27:3<499:AOVIBO>2.0.ZU;2-W
Abstract
Egg deposition of the elm leaf beetle Xanthogaleruca luteola causes the emi ssion of volatiles from its food plant, Ulmus minor. These volatiles are ex ploited by the egg parasitoid, Oomyzus gallerucae, to locate its host. In c ontrast to other tritrophic systems, the release of volatiles is not induce d by feeding but by egg deposition. Previous investigations showed that the release is systemic and can be triggered by jasmonic acid. Comparison of h eadspace analysis revealed similarities in the blend of volatiles emitted f ollowing egg deposition and feeding. The mixture consists of more than 40 c ompounds; most of the substances are terpenoids. Leaves next to those carry ing eggs emit fewer compounds. When treated with jasmonic acid, leaves emit a blend that consists almost exclusively of terpenoids. Dichloromethane ex tracts of leaves treated with jasmonic acid were also investigated. After s eparation of extracts of jasmonate induced elm leaves on silica, we obtaine d a fraction of terpenoid hydrocarbons that was attractive to the parasitoi ds. This indicates that jasmonic acid stimulates the production of terpenoi d hydrocarbons that convey information of egg deposition to the parasitoid.