Responses of Tribolium castaneum to olfactory cues from cotton seeds, the fungi associated with cotton seeds, and cereals

Ahmad, Faheem, Daglish, Gregory J., Ridley, Andrew W. and Walter, Gimme H. (2012) Responses of Tribolium castaneum to olfactory cues from cotton seeds, the fungi associated with cotton seeds, and cereals. Entomologia Experimentalis et Applicata, 145 3: 272-281. doi:10.1111/eea.12012


Author Ahmad, Faheem
Daglish, Gregory J.
Ridley, Andrew W.
Walter, Gimme H.
Title Responses of Tribolium castaneum to olfactory cues from cotton seeds, the fungi associated with cotton seeds, and cereals
Journal name Entomologia Experimentalis et Applicata   Check publisher's open access policy
ISSN 0013-8703
1570-7458
Publication date 2012-12
Sub-type Article (original research)
DOI 10.1111/eea.12012
Open Access Status
Volume 145
Issue 3
Start page 272
End page 281
Total pages 10
Place of publication Chichester, West Sussex, United Kingdom
Publisher Wiley-Blackwell
Collection year 2013
Language eng
Abstract We tested, in an olfactometer, whether or not Tribolium castaneum Herbst (Coleoptera: Tenebrionidae) responds preferentially to the volatiles that emanate from the fungi associated with cotton [Gossypium hirsutum L. (Malvaceae)] seed over those that emanate from cereals, because cereals are usually portrayed as the primary resources of these beetles. Pairwise comparisons were conducted between cotton seed, wheat (Triticum aestivum L.), and sorghum [Sorghum bicolor (L.) Moench] (both Poaceae); volatiles were tested from intact seeds and from both water and ethanol extracts. The results demonstrate that T. castaneum is attracted more strongly to cotton seeds with its lint contaminated with fungi, than to the conventional resources of this species (i.e., wheat and sorghum). Further tests prove that it is the fungus on the lint that produces the active volatiles, because the beetles did not respond to sterilized cotton lint (i.e., without the fungi typically associated with it when cotton seed is stored). Tests with five fungal cultures (each representing an unidentified species that was isolated from the field-collected cotton lint) were variable across the cultures, with only one of them being significantly attractive to the beetles. The others were not attractive and one may even have repulsed the beetles. The results are consistent with the beetles having a strong ecological association with fungi and suggest it would be worth investigating the ecology of T. castaneum from this perspective.
Keyword Fungal association
Olfactometer
Rust-red flour beetle
Volatile extracts
Cotton lint
Stored grain
Colonization
Wheat
Sorghum
Coleoptera
Tenebrionidae
Gossypium hirsutum
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article first published online: 19 October 2012.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2013 Collection
School of Biological Sciences Publications
 
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