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J Insect Physiol

Title:		"Electroantennogram responses of the three migratory forms of the damson-hop aphid, Phorodon humuli, to aphid pheromones and plant volatiles"
Author(s):		Pope TW; Campbell CA; Hardie J; Wadhams LJ;
Address:		"East Malling Research, New Road, East Malling, Kent ME19 6BJ, UK. t.pope@imperial.ac.uk"
Journal Title:		J Insect Physiol
Year:		2004
Volume:		50
Issue:		11
Page Number:		1083 - 1092
DOI:		10.1016/j.jinsphys.2004.09.010
ISSN/ISBN:		0022-1910 (Print) 0022-1910 (Linking)
Abstract:		"Electroantennogram (EAG) responses were recorded from alate fundatrigeniae (spring migrants), gynoparae (the winged female form that produces sexual females) and males, the three migratory forms of the damson-hop aphid, Phorodon humuli (Schrank). EAG responses of gynoparae and males showed typical dose response characteristics to (E)-2-hexenal, (-)-R-carvone, hexanenitrile and (1RS,4aR,7S,7aS)-nepetalactol, the sex pheromone of this species. The 34 plant volatiles elicited broadly similar EAG response profiles in the three migratory forms. Green leaf volatiles produced large responses in all forms; however, the relative order of responsiveness varied. EAG responses to isomers of the monoterpene carvone differed between forms, with males being most, and spring migrants least, responsive. The hop-plant volatile and aphid alarm pheromone, (E)-beta-farnesene, evoked similar EAG responses in all forms. By contrast, males were most responsive to the three sex pheromone components, (-)-(4aS,7S,7aR)-nepetalactol, (+)-(4aS,7S,7aR)-nepetalactone and (1RS,4aR,7S,7aS)-nepetalactol. Males were no more responsive to their own sex pheromone, (1RS,4aR,7S,7aS)-nepetalactol, than to the other aphid sex pheromone components tested. Spring migrants and gynoparae also responded to the three sex pheromone components. This study indicates that migratory forms of P. humuli detect a wide range of volatile compounds, and that they are equally well-adapted for the detection of volatiles associated with host and non-host plants and with other species of aphid"
Keywords:		Animal Migration Animals Aphids/growth & development/*physiology Electrophysiology Female Life Cycle Stages Male Pheromones/*physiology Seasons Sense Organs/physiology;
Notes:		"MedlinePope, Tom W Campbell, Colin A M Hardie, Jim Wadhams, Lester J eng Research Support, Non-U.S. Gov't England 2004/12/21 J Insect Physiol. 2004 Nov; 50(11):1083-92. doi: 10.1016/j.jinsphys.2004.09.010"