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Plant Signal Behav. 2014 Jun 13;9. pii: e29517. [Epub ahead of print]

Volatile interaction between undamaged plants affects tritrophic interactions through changed plant volatile emission.

Author information

1
Department of Crop Production Ecology; Swedish University of Agricultural Sciences; Uppsala, Sweden; Faculty of Agriculture; University of Belgrade; Belgrade, Serbia.
2
Department of Ecology; Swedish University of Agricultural Sciences; Uppsala, Sweden.
3
Faculty of Agriculture; University of Belgrade; Belgrade, Serbia.
4
Department of Crop Production Ecology; Swedish University of Agricultural Sciences; Uppsala, Sweden.

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.

KEYWORDS:

(E)-nerolidol; Coccinella septempunctata; TMTT; aphids; ladybird; natural enemies; onion; plant–plant communication; potato; volatiles

PMID:
24927115

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