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Insects

Title:		"Alarm Pheromone Responses Depend on Genotype, but Not on the Presence of Facultative Endosymbionts in the Pea Aphid Acyrthosiphon pisum"
Author(s):		Badji CA; Sol-Mochkovitch Z; Fallais C; Sochard C; Simon JC; Outreman Y; Anton S;
Address:		"IGEPP, INRAE, Institut Agro, University Rennes, CEDEX, 49045 Angers, France. IGEPP, INRAE, Institut Agro, University Rennes, CEDEX, 35000 Rennes, France. IGEPP, INRAE, Institut Agro, University Rennes, CEDEX, 35653 Le Rheu, France"
Journal Title:		Insects
Year:		2021
Volume:		20210108
Issue:		1
Page Number:		-
DOI:		10.3390/insects12010043
ISSN/ISBN:		2075-4450 (Print) 2075-4450 (Electronic) 2075-4450 (Linking)
Abstract:		"Aphids use an alarm pheromone, E-beta farnesene (EBF), to warn conspecifics of potential danger. The antennal sensitivity and behavioural escape responses to EBF can be influenced by different factors. In the pea aphid, Acyrthosiphon pisum, different biotypes are adapted to different legume species, and within each biotype, different genotypes exist, which can carry or not Hamiltonella defensa, a bacterial symbiont that can confer protection against natural enemies. We investigate here the influence of the aphid genotype and symbiotic status on the escape behaviour using a four-way olfactometer and antennal sensitivity for EBF using electroantennograms (EAGs). Whereas the investigated three genotypes from two biotypes showed significantly different escape and locomotor behaviours in the presence of certain EBF doses, the infection with H. defensa did not significantly modify the escape behaviour and only marginally influenced the locomotor behaviour at high doses of EBF. Dose-response curves of EAG amplitudes after stimulation with EBF differed significantly between aphid genotypes in correlation with behavioural differences, whereas antennal sensitivity to EBF did not change significantly as a function of the symbiotic status. The protective symbiont H. defensa does thus not modify the olfactory sensitivity to the alarm pheromone. How EBF sensitivity is modified between genotypes or biotypes remains to be investigated"
Keywords:		Hamiltonella defensa Hemiptera aphid alarm pheromone avoidance behaviour electroantennography endosymbiotic bacteria olfactometry;
Notes:		"PubMed-not-MEDLINEBadji, Cesar Auguste Sol-Mochkovitch, Zoe Fallais, Charlotte Sochard, Corentin Simon, Jean-Christophe Outreman, Yannick Anton, Sylvia eng 16-CE02-0014/Agence Nationale de la Recherche/ Symbiogate/INRAE Departement SPE/ Switzerland 2021/01/13 Insects. 2021 Jan 8; 12(1):43. doi: 10.3390/insects12010043"