title: Vicia faba-Lygus rugulipennis interactions: induced plant volatiles and sex pheromone enhancement.
abstract: The profiles of volatile chemicals emitted by Vicia faba plants damaged by Lygus rugulipennis feeding, and by feeding plus oviposition, were shown to be quantitatively different from those released by undamaged plants. Samples of volatile chemicals collected from healthy plants, plants damaged by males as a consequence of feeding, plants damaged by females as a consequence of feeding and oviposition, plants damaged by feeding with mated males still present, and plants damaged by feeding and oviposition with gravid females still present, showed significant differences in the emission of hexyl acetate, (Z)-beta-ocimene, (E)-beta-ocimene, (E)-beta-caryophyllene, and methyl salicylate. In particular, treatments with mated females present on plants had a significant increase in emission levels of the above compounds, possibly due to eggs laid within plant tissues or active feeding, compared with undamaged plants and plants damaged by males feeding, with or without insects still present. Furthermore, the pheromonal blend released by mated L. rugulipennis females, mainly comprising hexyl butyrate, (E)-2-hexenyl butyrate, and (E)-4-oxo-2-hexenal, was enhanced when females were active on broad bean plants, whereas such an increase was not observed in males. Both sexes gave electroantennogram responses to green leaf volatiles from undamaged plants and to methyl salicylate and (E)-beta-caryophyllene emitted by Lygus-damaged plants, suggesting that these compounds may be involved in colonization of host plants by L. rugulipennis. In addition, mated males and females were responsive to hexyl butyrate, (E)-2-hexenyl butyrate, and (E)-4-oxo-2-hexenal released by mated females on V. faba, indicating that these substances could have a dual function as a possible aggregation pheromone in female-female communication, and as a sex pheromone in female-male communication.
authors.affiliation: Dipartimento di Scienze Agrarie e Ambientali-Entomologia, University of Perugia, Italy. francescafrati@tiscali.it
authors.forename: Francesca
authors.initials: F
authors.lastname: Frati
authors.forename: Keith
authors.initials: K
authors.lastname: Chamberlain
authors.forename: Michael
authors.initials: M
authors.lastname: Birkett
authors.forename: Samuel
authors.initials: S
authors.lastname: Dufour
authors.forename: Patrick
authors.initials: P
authors.lastname: Mayon
authors.forename: Christine
authors.initials: C
authors.lastname: Woodcock
authors.forename: Lester
authors.initials: L
authors.lastname: Wadhams
authors.forename: John
authors.initials: J
authors.lastname: Pickett
authors.forename: Gianandrea
authors.initials: G
authors.lastname: Salerno
authors.forename: Eric
authors.initials: E
authors.lastname: Conti
authors.forename: Ferdinando
authors.initials: F
authors.lastname: Bin
mesh_terms: D000818:Animals; D002849:Chromatography, Gas; D004594:Electrophysiology; D005260:Female; D020062:Heteroptera / Q000502:physiology*; D006790:Host-Parasite Interactions; D008297:Male; D012724:Sex Attractants / Q000494:pharmacology / Q000502:physiology*; D012737:Sex Factors; D031307:Vicia faba / Q000378:metabolism / Q000502:physiology*; D014835:Volatilization
chemical_list: D012724:Sex Attractants