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The ratio between field attractive and background volatiles encodes host-plant recognition in a specialist moth

Knudsen, Geir and Norli, Hans Ragnar and Tasin, Marco (2017). The ratio between field attractive and background volatiles encodes host-plant recognition in a specialist moth. Frontiers in Plant Science. 8, 1-11
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Official URL: http://dx.doi.org/10.3389/fpls.2017.02206

Abstract

Volatiles emitted by plants convey an array of information through different trophic levels. Animals such as host-seeking herbivores encounter plumes with filaments from both host and non-host plants. While studies showed a behavioral effect of non-host plants on herbivore host location, less information is available on how a searching insect herbivore perceives and flies upwind to a host-plant odor plume within a background of non-host volatiles. We hypothesized here that herbivorous insects in search of a host-plant can discriminate plumes of host and non-host plants and that the taxonomic relatedness of the non-host have an effect on finding the host. We also predicted that the ratio between certain plant volatiles is cognized as host-plant recognition cue by a receiver herbivorous insect. To verify these hypotheses we measured the wind tunnel response of the moth Argyresthia conjugella to the host plant rowan, to non-host plants taxonomically related (Rosaceae, apple and pear) or unrelated to the host (Pinaceae, spruce) and to binary combination of host and non-host plants. Volatiles were collected from all plant combinations and delivered to the test insect via an ultrasonic sprayer as an artificial plume. While the response to the rowan as a plant was not affected by the addition of any of the non-host plants, the attraction to the corresponding sprayed headspace decreased when pear or apple but not spruce were added to rowan. A similar result was measured toward the odor exiting a jar where freshly cut plant material of apple or pear or spruce was intermixed with rowan. Dose-response gaschromatography coupled to electroantennography revealed the presence of seven field attractive and seven background non-attractive antennally active compounds. Although the abundance of field attractive and of some background volatiles decreased in all dual combinations in comparison with rowan alone, an increased amount of the background compounds (3E)-4,8-Dimethyl-1,3,7-nonatriene ((E)-DMNT) and (Z)-3-hexenyl acetate was found in the rowan-apple and rowan-pear but not in the rowan-spruce headspace. A higher ratio between the abundance of each field attractive component and that of (E)-DMNT and (Z)-3-hexenyl acetate was measured for rowan and rowan-spruce in contrast to rowan-pear and rowan-apple headspaces. Our result suggests that the ratio between field attractive and background antennaly active volatiles encodes host-plant recognition in our study system.

Authors/Creators:Knudsen, Geir and Norli, Hans Ragnar and Tasin, Marco
Title:The ratio between field attractive and background volatiles encodes host-plant recognition in a specialist moth
Series/Journal:Frontiers in Plant Science (1664-462X)
Year of publishing :2017
Volume:8
Page range:1-11
Number of Pages:11
Publisher:Frontiers Media
ISSN:1664-462X
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
Agrovoc terms:olfaction, Insecta, host plants, Argyresthia, Sorbus, volatile compounds
Keywords:(3E)-4,8-Dimethyl-1,3,7-nonatriene, ultrasonic sprayer, apple fruit moth, Malus domestica, Sorbus aucuparia, Rosaceae, Picea abies, Pinaceae
URN:NBN:urn:nbn:se:slu:epsilon-e-4730
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-4730
Additional ID:
Type of IDID
DOI10.3389/fpls.2017.02206
Web of Science (WoS)000418587300002
ID Code:15288
Faculty:LTV - Fakulteten för landskapsarkitektur, trädgårds- och växtproduktionsvetenskap
Department:(LTJ, LTV) > Department of Plant Protection Biology
Deposited By: SLUpub Connector
Deposited On:08 Feb 2018 10:53
Metadata Last Modified:08 Feb 2018 13:07

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