title: Volatile interaction between undamaged plants affects tritrophic interactions through changed plant volatile emission.
abstract: Volatile interactions between unattacked plants can lead to changes in their volatile emissions. Exposure of potato plants to onion plant volatiles results in increased emission of 2 terpenoids, (E)-nerolidol and TMTT. We investigated whether this is detectable by the ladybird Coccinella septempunctata. The odor of onion-exposed potato was significantly more attractive to ladybirds than that of unexposed potato. Further, a synthetic blend mimicking the volatile profile of onion-exposed potato was more attractive than a blend mimicking that of unexposed potato. When presented individually, TMTT was attractive to ladybirds whereas (E)-nerolidol was repellent. Volatile exchange between unattacked plants and consequent increased attractiveness for ladybirds may be a mechanism that contributes to the increased abundance of natural enemies in complex plant habitats.
authors.affiliation: a Department of Crop Production Ecology; Swedish University of Agricultural Sciences; Uppsala, Sweden.
authors.forename: Andja
authors.initials: A
authors.lastname: Vucetic
authors.forename: Iris
authors.initials: I
authors.lastname: Dahlin
authors.forename: Olivera
authors.initials: O
authors.lastname: Petrovic-Obradovic
authors.forename: Robert
authors.initials: R
authors.lastname: Glinwood
authors.forename: Ben
authors.initials: B
authors.lastname: Webster
authors.forename: Velemir
authors.initials: V
authors.lastname: Ninkovic
mesh_terms: D000475:Alkenes / Q000378:metabolism; D000818:Animals; D001042:Aphids; D001522:Behavior, Animal; D001517:Coleoptera; D017753:Ecosystem; D005247:Feeding Behavior; D060434:Herbivory; D009812:Odorants / Q000032:analysis; D019697:Onions / Q000378:metabolism*; D010675:Pheromones / Q000378:metabolism*; D010935:Plant Diseases; D012717:Sesquiterpenes / Q000378:metabolism; D011198:Solanum tuberosum / Q000187:drug effects / Q000378:metabolism*; D013729:Terpenes / Q000378:metabolism; D055549:Volatile Organic Compounds / Q000378:metabolism*
chemical_list: C500824:4,8,12-trimethyl-1,3,7,11-tridecatetraene; D000475:Alkenes; D010675:Pheromones; D012717:Sesquiterpenes; D013729:Terpenes; D055549:Volatile Organic Compounds; C037055:nerolidol
keywords: (E)-nerolidol; Coccinella septempunctata; TMTT; aphids; ladybird; natural enemies; onion; plant–plant communication; potato; volatiles