| Title: | "Identification of semiochemicals released by cotton, Gossypium hirsutum, upon infestation by the cotton aphid, Aphis gossypii" |
| Author(s): | Hegde M; Oliveira JN; da Costa JG; Bleicher E; Santana AE; Bruce TJ; Caulfield J; Dewhirst SY; Woodcock CM; Pickett JA; Birkett MA; |
| Address: | "Department of Agricultural Entomology, University of Agricultural Sciences, Dharwad, Karnataka, India" |
| DOI: | 10.1007/s10886-011-9980-x |
| ISSN/ISBN: | 1573-1561 (Electronic) 0098-0331 (Linking) |
| Abstract: | "The cotton aphid, Aphis gossypii (Homoptera: Aphididae), is increasing in importance as a pest worldwide since the introduction of Bt-cotton, which controls lepidopteran but not homopteran pests. The chemical ecology of interactions between cotton, Gossypium hirsutum (Malvaceae), A. gossypii, and the predatory lacewing Chrysoperla lucasina (Neuroptera: Chrysopidae), was investigated with a view to providing new pest management strategies. Behavioral tests using a four-arm (Pettersson) olfactometer showed that alate A. gossypii spent significantly more time in the presence of odor from uninfested cotton seedlings compared to clean air, but significantly less time in the presence of odor from A. gossypii infested plants. A. gossypii also spent significantly more time in the presence of headspace samples of volatile organic compounds (VOCs) obtained from uninfested cotton seedlings, but significantly less time with those from A. gossypii infested plants. VOCs from uninfested and A. gossypii infested cotton seedlings were analyzed by gas chromatography (GC) and coupled GC-mass spectrometry (GC-MS), leading to the identification of (Z)-3-hexenyl acetate, (E)-4,8-dimethyl-1,3,7-nonatriene (DMNT), methyl salicylate, and (E,E)-4,8,12-trimethyl-1,3,7,11-tridecatetraene (TMTT), which were produced in larger amounts from A. gossypii infested plants compared to uninfested plants. In behavioral tests, A. gossypii spent significantly more time in the control (solvent) arms when presented with a synthetic blend of these four compounds, with and without the presence of VOCs from uninfested cotton. Coupled GC-electroantennogram (EAG) recordings with the lacewing C. lucasina showed significant antennal responses to VOCs from A. gossypii infested cotton, suggesting they have a role in indirect defense and indicating a likely behavioral role for these compounds for the predator as well as the aphid" |
| Keywords: | "Acetates/isolation & purification Alkenes/isolation & purification Animals Aphids/*physiology Behavior, Animal/*physiology Gas Chromatography-Mass Spectrometry Gossypium/*chemistry/physiology Pheromones/*isolation & purification Terpenes/isolation & purif;" |
| Notes: | "MedlineHegde, Mahabaleshwar Oliveira, Janser N da Costa, Joao G Bleicher, Ervino Santana, Antonio E G Bruce, Toby J A Caulfield, John Dewhirst, Sarah Y Woodcock, Christine M Pickett, John A Birkett, Michael A eng Biotechnology and Biological Sciences Research Council/United Kingdom Comparative Study Research Support, Non-U.S. Gov't 2011/06/15 J Chem Ecol. 2011 Jul; 37(7):741-50. doi: 10.1007/s10886-011-9980-x. Epub 2011 Jun 14" |
