| 2. |
- Mozuraitis, Raimondas, 1963-
(författare)
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Pheromone release behaviour in females of Phyllonorycter strigulatella (Lien. & Z.) and Ph. sorbi (Frr.) (Lepidoptera, Gracillariidae) under cycling temperature
- 2006
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Ingår i: Ekologija. - Lithuania : Lithuanian Academy of Sciences. - 0235-7224. ; 52:4, s. 7-11
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The pheromone release postures of virgin Phyllonorycter strigulatella andPh. sorbi females were very similar to those of other species of the samegenus with antennae held close to the wings, which were slightly spread andlowered, the abdominal tip dorsally curved and the distal segments extended.In both species with equal sex ratios, one peak of signalling activity wasregistered 0.5 h after the light had been put on and when 84% of Ph. strigulatellaand 90% of Ph. sorbi individuals were active. The high pheromonerelease behaviour with 50% active females lasted for two hours. The callingactivity of the group of females was about 6 h/day for both species. The totalperiod of calling activity of an individual female lasted for 131 ± 62 min(mean ± SD) and 145 ± 73 min a day for Ph. strigulatella and Ph. sorbirespectively. The occurrence of one signalling peak per day in the specieswith equal sex ratios as found in Ph. strigulatella and Ph. sorbi, supportedthe hypothesis that pheromone release activity with a clear presence of twoactivity peaks during a photophase could be adaptive for species with a sexratio strongly shifted towards females, as in Ph. junoniella.
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| 3. |
- Ulland, S., et al.
(författare)
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Methyl salicylate, identified as primary odorant of a specific receptor neuron type, inhibits oviposition by the moth Mamestra brassicae L. (Lepidoptera, Noctuidae)
- 2008
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Ingår i: Chemical Senses. - : Oxford University Press (OUP). - 0379-864X .- 1464-3553. ; 33:1, s. 35-46
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Tidskriftsartikel (refereegranskat)abstract
- The cabbage moth, Mamestra brassicae L. (Lepidoptera, Noctuidae), is a polyphagous species that is often choosing plants of Brassica as hosts for oviposition. In the search for biologically relevant odorants used by these moths, gas chromatography linked to electrophysiological recordings from single receptor neurons (RNs) has been employed, resulting in classification of distinct types of neurons. This study presents specific olfactory RNs responding to methyl salicylate (MeS) as primary odorant and showing a weak response to methyl benzoate, the 2 aromatic compounds occurring together in several plant species. In 2 cases, the neuron was colocated with another RN type responding to 6 green leaf volatiles: 1-hexanol, (3Z)-hexen-1-ol, (2E)-hexen-1-ol, (3Z)-hexenyl acetate, (2Z)-hexen-1-ol, and an unidentified compound. Whereas the specific RNs detected the minor amounts of MeS in some plants, the compound was not found by gas chromatography linked to mass spectrometry in intact plants, but it was found after herbivore attack. The behavioral effect of MeS was studied in outdoor test arenas with Brassica napus and artificial plants. These experiments indicated that mated M. brassicae females avoid plants with dispensers emitting MeS. As it is induced by caterpillar feeding, this compound may mediate a message to mated M. brassicae females that the plant is already occupied.
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