caa a22 4500 386376042 CHVBK 20180307112018.0 cr unu---uuuuu 161130e198904 xx s 000 0 eng 10.1017/S1742758400010390 doi S1742758400010390 pii (NATIONALLICENCE)cambridge-10.1017/S1742758400010390 Sex pheromone attractants and inhibitors in the cabbage armyworm, Mamestra brassicae L. (Lep.: Noctuidae): Electrophysiological discrimination [Elektronische Daten] EAG recordings revealed that from the six substances isolated so far from pheromone glands of Marnestra brassicae females, only (Z)-11-hexadecenyl acetate (Z11-16Ac), (Z)-9-hexadecenyl acetate (Z9-16Ac) and (Z)-11-heptadecenyl acetate (Z11-17Ac) are perceived by the males. This suggests that these substances may be female sex pheromone components. The male olfactory sensilla also respond to (Z)-9-tetradecenyl acetate (Z9-14Ac) and (Z)-11-hexadecenol (Z11-160H), which are sex attractant constituents of various closely related species, but act as strong attractant inhibitors on M. brassicae males. This sensitivity to Z9-14Ac and Z11-160H is suggested to enhance the males' possibility to discriminate between conspecific and non-conspecific females. Single sensillum recordings revealed that in 90% of the male antennal sensilla trichodea tested, three cell types (Types A, B, and C) were active. In the remaining 10% only B and C action potentials were seen. The Type C cells are exclusively responsive to the major pheromone component Z11-16Ac. The Type C cells are activated by the attractant inhibitors Z9-14Ac and Z11-160H, and to a small extent by Z11-16Ac. Responses to mixtures of these substances revealed that addition of Z9-14Ac and Z11-160H to Z11-16Ac changed the activity of the A cells only and did not affect the activities of the A and C cells. It is concluded that volatiles which exclusively or predominantly activate the Type B cells induce avoidance behaviour in the males, whereas substances activating the Type C cells evoke sexual behaviour and are attractive. This offers possibilities for relatively rapid electrophysiological determination of substances inducing sexual or avoidance behaviour. The function of the A cells is not yet clear. These cells respond to low concentrations of Z11-16Ac and Z11-160H, which may enhance the males' capacity to distinguish conspecific from non-conspecific females at a distance, when concentrations are low and the C and B cell activities are small. It is suggested that cells sensitive to Z9-16Ac and Z11-17Ac are present in a limited number of sensilla only. Copyright © ICIPE 1989 Mamestra brassicae nationallicence olfaction nationallicence EAG nationallicence single cell nationallicence pheromone nationallicence attractants nationallicence attractant inhibitors nationallicence sexual communication nationallicence Den Otter C. J. Sensory Physiology Group, Department of Animal Physiology, University of Groningen, P.O. Box 14, 9750 AA Haren, The Netherlands Van Der Haagen M. M. Sensory Physiology Group, Department of Animal Physiology, University of Groningen, P.O. Box 14, 9750 AA Haren, The Netherlands International Journal of Tropical Insect Science Cambridge University Press 10/2(1989-04), 235-242 1742-7584 10:2<235 1989 10 JTI https://doi.org/10.1017/S1742758400010390 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S1742758400010390 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Den Otter C. J. Sensory Physiology Group, Department of Animal Physiology, University of Groningen, P.O. Box 14, 9750 AA Haren, The Netherlands NATIONALLICENCE 700 1- Van Der Haagen M. M. Sensory Physiology Group, Department of Animal Physiology, University of Groningen, P.O. Box 14, 9750 AA Haren, The Netherlands NATIONALLICENCE 773 0- International Journal of Tropical Insect Science Cambridge University Press 10/2(1989-04), 235-242 1742-7584 10:2<235 1989 10 JTI CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge