LOCUST NEUROPEPTIDES STIMULATING SEX-PHEROMONE PRODUCTION IN FEMALE EUROPEAN CORN-BORER MOTH, OSTRINIA-NUBILALIS

The presence of a pheromonotropically active hormone (PBAN-like substance) from locust organs, (Locusta migratoria) has been demonstrated. Extracts of brain, corpora cardiaca, corpora allata, suboesophageal ganglia and thoracic ganglia of L. migratoria caused highly pheromonotropic responses in decapitated females of the European corn borer moth (Ostrinia nubilalis). The highest activity per unit weight of tissue was found in the corpora cardiaca and corpora allata of the locust followed by the brain plus suboesophageal ganglion of O. nubilalis. Following 8 days of disconnection, separating the corpora allata from the corpora cardiaca and suboesophageal ganglion, the pheromonotropic activity of the corpora allata was maintained at a level similar to that observed in intact organs, while that of the corpora cardiaca and suboesophageal ganglion was decreased. The corpora allata extract was heat stable but destroyed by proteases. Thus, the pheromonotropic hormone from locust cerebral organs which displays potent PBAN activity could be a peptide originating principally in the corpora allata. © 1990.