Host selection by Ibalia leucospoides based on temporal variations of volatiles from the hosts’ fungal symbiont
Insect parasitoids locate hosts via reliable and predictable cues such as volatile emissions from hosts and/or host plants. For insects that depend on mutualistic organisms, such as many wood-boring insects, symbiont-derived semiochemicals may represent a source of such cues to be exploited by natur...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_09312048_v140_n10_p736_Jofre |
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todo:paper_09312048_v140_n10_p736_Jofre2023-10-03T15:48:14Z Host selection by Ibalia leucospoides based on temporal variations of volatiles from the hosts’ fungal symbiont Jofré, N. Pildain, M.B. Cirigliano, A.M. Cabrera, G.M. Corley, J.C. Martínez, A.S. Amylostereum areolatum biocontrol foraging headspace analysis semiochemical Sirex noctilio biocontrol agent fitness foraging behavior fungus gas chromatography host selection host-parasitoid interaction integrated pest management natural enemy oviposition parasitoid semiochemical symbiont temporal variation volatile organic compound wasp Amylostereum areolatum Hexapoda Ibalia leucospoides Sirex Sirex noctilio Insect parasitoids locate hosts via reliable and predictable cues such as volatile emissions from hosts and/or host plants. For insects that depend on mutualistic organisms, such as many wood-boring insects, symbiont-derived semiochemicals may represent a source of such cues to be exploited by natural enemies. Ultimately, exploitation of these signals may increase fitness by optimizing foraging efficiency. Female parasitoids of Ibalia leucospoides use volatiles from the fungal symbiont Amylostereum areolatum of their host Sirex noctlio to find concealed host eggs and young larvae within the xylem. We hypothesize that the temporal pattern of fungal emissions may indicate not only the presence of host larvae but also be used as a cue that indicates host suitability and age. Such information would allow female parasitoids to discern more efficiently between hosts within ovipositor reach from those already buried too deep into the xylem and out of reach. In this context, we assessed the behaviour of I. leucospoides females to volatiles of A. areolatum in a ‘Y’-tube olfactometer at regular intervals over 30 days. We concurrently examined the fungal volatiles by headspace sampling through solid-phase microextraction (SPME) followed by gas chromatography mass spectrometry (GC-MS). We observed that females were attracted to volatiles produced by two-week-old fungal cultures, a period that matches when older larvae are still within ovipositor reach. Four chemical compounds were detected: ethanol, acetone, acetaldehyde and the sesquiterpene 2,2,8-trimethyltricyclo[6.2.2.01,6]dodec-5-ene, with each compounds’ relative abundance changing over time. Results are discussed in the context of parasitoids fitness. Future studies involving electrophysiology, different collection techniques and further behavioural assays will help in identifying the compounds that convey temporal information to female parasitoids and have the potential for being used in integrated pest management programmes. © 2016 Blackwell Verlag GmbH Fil:Jofré, N. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pildain, M.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cirigliano, A.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Cabrera, G.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Corley, J.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09312048_v140_n10_p736_Jofre |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Amylostereum areolatum biocontrol foraging headspace analysis semiochemical Sirex noctilio biocontrol agent fitness foraging behavior fungus gas chromatography host selection host-parasitoid interaction integrated pest management natural enemy oviposition parasitoid semiochemical symbiont temporal variation volatile organic compound wasp Amylostereum areolatum Hexapoda Ibalia leucospoides Sirex Sirex noctilio |
| spellingShingle |
Amylostereum areolatum biocontrol foraging headspace analysis semiochemical Sirex noctilio biocontrol agent fitness foraging behavior fungus gas chromatography host selection host-parasitoid interaction integrated pest management natural enemy oviposition parasitoid semiochemical symbiont temporal variation volatile organic compound wasp Amylostereum areolatum Hexapoda Ibalia leucospoides Sirex Sirex noctilio Jofré, N. Pildain, M.B. Cirigliano, A.M. Cabrera, G.M. Corley, J.C. Martínez, A.S. Host selection by Ibalia leucospoides based on temporal variations of volatiles from the hosts’ fungal symbiont |
| topic_facet |
Amylostereum areolatum biocontrol foraging headspace analysis semiochemical Sirex noctilio biocontrol agent fitness foraging behavior fungus gas chromatography host selection host-parasitoid interaction integrated pest management natural enemy oviposition parasitoid semiochemical symbiont temporal variation volatile organic compound wasp Amylostereum areolatum Hexapoda Ibalia leucospoides Sirex Sirex noctilio |
| description |
Insect parasitoids locate hosts via reliable and predictable cues such as volatile emissions from hosts and/or host plants. For insects that depend on mutualistic organisms, such as many wood-boring insects, symbiont-derived semiochemicals may represent a source of such cues to be exploited by natural enemies. Ultimately, exploitation of these signals may increase fitness by optimizing foraging efficiency. Female parasitoids of Ibalia leucospoides use volatiles from the fungal symbiont Amylostereum areolatum of their host Sirex noctlio to find concealed host eggs and young larvae within the xylem. We hypothesize that the temporal pattern of fungal emissions may indicate not only the presence of host larvae but also be used as a cue that indicates host suitability and age. Such information would allow female parasitoids to discern more efficiently between hosts within ovipositor reach from those already buried too deep into the xylem and out of reach. In this context, we assessed the behaviour of I. leucospoides females to volatiles of A. areolatum in a ‘Y’-tube olfactometer at regular intervals over 30 days. We concurrently examined the fungal volatiles by headspace sampling through solid-phase microextraction (SPME) followed by gas chromatography mass spectrometry (GC-MS). We observed that females were attracted to volatiles produced by two-week-old fungal cultures, a period that matches when older larvae are still within ovipositor reach. Four chemical compounds were detected: ethanol, acetone, acetaldehyde and the sesquiterpene 2,2,8-trimethyltricyclo[6.2.2.01,6]dodec-5-ene, with each compounds’ relative abundance changing over time. Results are discussed in the context of parasitoids fitness. Future studies involving electrophysiology, different collection techniques and further behavioural assays will help in identifying the compounds that convey temporal information to female parasitoids and have the potential for being used in integrated pest management programmes. © 2016 Blackwell Verlag GmbH |
| format |
JOUR |
| author |
Jofré, N. Pildain, M.B. Cirigliano, A.M. Cabrera, G.M. Corley, J.C. Martínez, A.S. |
| author_facet |
Jofré, N. Pildain, M.B. Cirigliano, A.M. Cabrera, G.M. Corley, J.C. Martínez, A.S. |
| author_sort |
Jofré, N. |
| title |
Host selection by Ibalia leucospoides based on temporal variations of volatiles from the hosts’ fungal symbiont |
| title_short |
Host selection by Ibalia leucospoides based on temporal variations of volatiles from the hosts’ fungal symbiont |
| title_full |
Host selection by Ibalia leucospoides based on temporal variations of volatiles from the hosts’ fungal symbiont |
| title_fullStr |
Host selection by Ibalia leucospoides based on temporal variations of volatiles from the hosts’ fungal symbiont |
| title_full_unstemmed |
Host selection by Ibalia leucospoides based on temporal variations of volatiles from the hosts’ fungal symbiont |
| title_sort |
host selection by ibalia leucospoides based on temporal variations of volatiles from the hosts’ fungal symbiont |
| url |
http://hdl.handle.net/20.500.12110/paper_09312048_v140_n10_p736_Jofre |
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