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Chemical Senses Advance Access originally published online on February 17, 2008
Chemical Senses 2008 33(4):379-387; doi:10.1093/chemse/bjn005
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© The Author 2008. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

Antennal and Behavioral Responses of Cis boleti to Fungal Odor of Trametes gibbosa

Prodpran Thakeow, Sergio Angeli, Bernhard Weißbecker and Stefan Schütz

Institute of Forest Zoology and Forest Conservation, University of Göttingen, 37077 Göttingen, Germany

Correspondence to be sent to: Prodpran Thakeow, Institute of Forest Zoology and Forest Conservation, University of Göttingen, 37077 Göttingen, Germany. e-mail: pthakeo{at}gwdg.de


  Abstract

Cis boleti (Coleoptera: Ciidae) preferentially colonizes fungi from the genus Trametes that are known as important wood decomposers. The aim of our research was to investigate if C. boleti uses the chemical volatile composition of its fungal host, Trametes gibbosa, as a key attraction factor. Therefore, the T. gibbosa fruiting body volatiles were analysed by using gas chromatography–mass spectrometry, with parallel electroantennographic detection (GC-MS/EAD) using adults of C. boleti. Furthermore, we examined the behavioral responses of C. boleti to the T. gibbosa volatile compounds. The dominant component of the T. gibbosa fruiting body bouquet was 1-octen-3-ol. Other volatiles, like the aldehydes hexanal, nonanal, and (E,E)-2,4-decadienal and the terpene {alpha}-bisabolol, were present in minor quantities. 1-Octen-3-ol was released with a ratio of the (R)- and (S)-enantiomers of 93:7, respectively. Electroantennography (EAG) employing C. boleti antennae yielded consistently dominant responses to 1-octen-3-ol. GC–EAD and EAG responses to pure standard compounds showed that C. boleti also perceived other host fungal volatiles. A highly significant attraction to 1-octen-3-ol was observed in behavioral tests. Female beetles were significantly attracted to the (S)-(+)- enantiomer at 10 times lower doses than male beetles. Our finding is the first direct proof that ciid beetles use 1-octen-3-ol as a key cue for host finding.

Key words: EAG, fungivorous insect, GC–MS/EAD, host selection, (S)-(+)-1-octen-3-ol, VOCs

Accepted 7 January 2008


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