Differential Attractiveness of Potato Tuber Volatiles to Phthorimaea operculella (Gelechiidae) and the Predator Orius insidiosus (Anthocoridae)

The behavioral responses of the potato tuberworm moth Phthorimaea operculella and the polyphagous predator Orius insidiosus to volatiles emanating from exposed tubers were studied by four-arm olfactometer bioassays. Mated females of P. operculella distinguished volatiles released by intact potato tu...

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Bibliographic Details
Published in:	Journal of chemical ecology Vol. 33; no. 10; pp. 1845 - 1855
Main Authors:	Arab, Alberto, Trigo, José Roberto, Lourenção, André Luiz, Peixoto, Aiane Michele, Ramos, Fernanda, Bento, José Mauricio Simões
Format:	Journal Article
Language:	English
Published:	New York, NY New York : Springer-Verlag 01-10-2007 Springer Springer Nature B.V
Subjects:	Animal and plant ecology Animal, plant and microbial ecology Animals Behavior, Animal - drug effects Bioassays Biological and medical sciences Chemotaxis crop damage Female foraging Fundamental and applied biological sciences. Psychology Hemiptera - physiology herbivore-induced plant volatiles host location Larvae methyl jasmonate Moths - physiology olfactometry Orius insidiosus Phthorimaea operculella Plant Tubers - chemistry Potatoes predator-prey relationships predatory insects prey location Solanum tuberosum Solanum tuberosum - chemistry Synecology Terrestrial ecosystems Time Factors tritrophic interactions tuber volatiles tubers Vegetables volatile compounds Volatilization Attractant Insecta Tritrophic system Orius insidiosus Heteroptera Phthorimaea operculella Induced defense Pest Entomophagous Dicotyledones Plant volatiles Angiospermae Tuber Plant growth substance Gelechiidae Solanaceae Jasmonic acid Volatile compound Terpenoid Attraction Tritrophic interaction Solanum tuberosum Methyl jasmonate Induced response Vegetable crop Animal plant relation Anthocoridae Arthropoda Lepidoptera Spermatophyta Predator Invertebrata
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Summary:	The behavioral responses of the potato tuberworm moth Phthorimaea operculella and the polyphagous predator Orius insidiosus to volatiles emanating from exposed tubers were studied by four-arm olfactometer bioassays. Mated females of P. operculella distinguished volatiles released by intact potato tubers from volatiles damaged mechanically or by conspecific larvae. Volatiles from intact potato tubers were attractive to them. On the other hand, unmated females of P. operculella did not respond to tuber volatiles. Adults of O. insidiosus were attracted to volatiles from tubers damaged by P. operculella larvae, but did not respond to intact or mechanically damaged tubers. Methyl jasmonate (MeJA) was the only compound identified from the headspace of potato tubers (GC-MS of direct headspace sampling). The amount varied with the type of induction, being 0.001 ± 0.0003 ng g-¹ in tissues of intact fresh tubers, 0.002 ± 0.0007 ng g-¹ in mechanically damaged tubers, and showing a six- to tenfold increase in P. operculella damaged tubers (0.090 ± 0.006 ng g-¹). Behavioral bioassays with synthetic MeJA confirmed that the response of the insects is dependent on MeJA concentration. Mated females of P. operculella showed the highest response at 0.001 ng g-¹ (concentration released by intact tubers), whereas O. insidiosus showed the highest response, between 0.01 and 0.05 ng g-¹, which is close to the concentration released by P. operculella damaged tubers. Based on these results, we postulate that P. operculella and O. insidiosus have adapted their responses to plant volatiles differently, enabling them to locate suitable hosts or prey.
Bibliography:	http://dx.doi.org/10.1007/s10886-007-9358-2 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0098-0331 1573-1561
DOI:	10.1007/s10886-007-9358-2