title: Behavioral and electrophysiological responses of Helicoverpa assulta, H. armigera (Lepidoptera: Noctuidae), their F1 hybrids and backcross progenies to sex pheromone component blends.
abstract: Two sibling species, Helicoverpa assulta and Helicoverpa armigera both use (Z)-9-hexadecenal and (Z)-11-hexadecenal as their sex pheromone components but in almost reversed ratios, 93:7 and 3:97, respectively. H. assulta and H. armigera males performed upwind flight in response to the H. assulta sex pheromone blend (93:7). H. armigera responded strongly to the H. armigera blend (3:97), whereas H. assulta males remained inactive upon exposure to this blend. Both species gave clear dose-dependent electrophysiological responses to (Z)-11-hexadecenal. However, (Z)-9-hexadecenal evoked strong dose-dependent electrophysiological responses in H. assulta males but not in H. armigera. The two male F1 hybrids exhibited similar behavioral responses to two sex pheromone blends and electrophysiological responses to two pheromone components as H. armigera males. This indicated that H. armigera genes appear dominant in determining the behavioral response and electrophysiological responses. Behavioral and electrophysiological responses of backcrosses of male F1 hybrids (H. armigera female x H. assulta male) with female H. assulta and H. armigera were close to that of H. assulta and H. armigera, respectively. However, backcrosses of female F1 hybrids (H. assulta female x H. armigera male) with male H. assulta and H. armigera showed reduced behavioral responses but normal electrophysiological responses compared to males of the respective parental line.
authors.affiliation: State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, The Chinese Academy of Sciences, Beijing 100080, China.
authors.forename: Xin-Cheng
authors.initials: XC
authors.lastname: Zhao
authors.forename: Yun-Hua
authors.initials: YH
authors.lastname: Yan
authors.forename: Chen-Zhu
authors.initials: CZ
authors.lastname: Wang
mesh_terms: D000447:Aldehydes / Q000494:pharmacology; D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects*; D016009:Chi-Square Distribution; D003433:Crosses, Genetic; D004305:Dose-Response Relationship, Drug; D004338:Drug Combinations; D004594:Electrophysiology / Q000379:methods; D005260:Female; D006824:Hybridization, Genetic; D019476:Insect Proteins / Q000494:pharmacology*; D009036:Moths / Q000502:physiology*; D012679:Sense Organs / Q000187:drug effects / Q000502:physiology; D012724:Sex Attractants / Q000494:pharmacology*; D012726:Sexual Behavior, Animal / Q000187:drug effects*; D013045:Species Specificity
chemical_list: D000447:Aldehydes; D004338:Drug Combinations; D019476:Insect Proteins; D012724:Sex Attractants