NDLI: Electrophysiological and Behavioral Responses of Ips duplicatus to Aggregation Pheromone in Inner Mongolia, China: Amitinol as a Potential Pheromone Component

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Electrophysiological and Behavioral Responses of Ips duplicatus to Aggregation Pheromone in Inner Mongolia, China: Amitinol as a Potential Pheromone Component

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Electrophysiological and Behavioral Responses of Ips duplicatus to Aggregation Pheromone in Inner Mongolia, China: Amitinol as a Potential Pheromone Component

Content Provider	Springer Nature Link
Author	Zhang, Qing He Schlyter, Fredrik Liu, Guang Tian Sheng, Mao Ling Birgersson, Göran
Copyright Year	2007
Abstract	Volatiles from Ips duplicatus male hindgut extracts and aeration samples of spruce logs colonized by the virgin males were analyzed by coupled gas chromatography–mass spectrometry (GC-MS), coupled gas chromatography–electroantennographic detection (GC-EAD), and field trapping bioassays in Inner Mongolia, China. GC-MS analyses showed that males from nuptial chambers (for reproduction) produced hindgut volatile profiles similar to those of maturation feeding males from the nonreproductive galleries. The known aggregation pheromone components, ipsdienol (Id) and E-myrcenol (EM) are the major constituents of this blend, followed by several minor bark beetle-related compounds: 2-methyl-3-buten-2-ol, ipsenol, cis-verbenol, verbenone, 2-phenylethanol, myrtenol, and trans-myrtanol. The enantiomeric composition of the Id from the male hindgut extracts was determined to be a racemic mixture (50/50) by enantioselective GC. GC-EAD experiments indicated that I. duplicatus antennae from both sexes responded strongly not only to the known aggregation pheromone components, Id and EM, but also to the other minor conspecific-produced compounds. The strongest antennal response was elicited by the major pheromone component, Id, which was ca. 2–3 times higher than that elicited by the second component, EM. Electroantennogram dose-responses indicated that antennal response threshold to Id was approximately 100 times lower than that of EM. No synergistic effects between these occurred at peripheral level. A strong and repeatable EAD response was found to a trace compound (flame ionization detection undetectable) from both hindgut and aeration samples. The compound was identified as amitinol (At) based on the retention time and a further EAD analysis of a synthetic mixture. In the field trapping experiments, At increased the attraction of I. duplicatus to the traps baited with a binary blend of EM/Id (1:1) in a synergistic manner when tested at a low release rate (1:1:0.1) but had no effect on catches at the high release rate (1:1:1). This result suggests that At might be a part of the Chinese I. duplicatus aggregation pheromone system. The production ratios of EM/Id from the Inner Mongolian population (EM/Id ≈ 1:2.0–4) were twice as high as those reported from Europe (EM/Id ≈ 1:9), corresponding well with the differences in the optimal response ratios.
Starting Page	1303
Ending Page	1315
Page Count	13
File Format	PDF
ISSN	00980331
Journal	Journal of Chemical Ecology
Volume Number	33
Issue Number	7
e-ISSN	15731561
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-06-09
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Coleoptera Scolytidae Attractant GC-EAD GC-MS Ipsdienol E-myrcenol Amitinol Ipsenol Enantiomeric composition Physical Chemistry Agriculture Ecology Biological Microscopy
Content Type	Text
Resource Type	Article
Subject	Medicine Biochemistry Ecology, Evolution, Behavior and Systematics

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Electrophysiological and Behavioral Responses of Ips duplicatus to Aggregation Pheromone in Inner Mongolia, China: Amitinol as a Potential Pheromone Component

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Electrophysiological and Behavioral Responses of Ips duplicatus to Aggregation Pheromone in Inner Mongolia, China: Amitinol as a Potential Pheromone Component