Abstract
Abstract The accessory glands of male Melanoplus sanguinipes contain an oviposition stimulant. Injection of gland extracts from mature males induces oviposition in 75 per cent of capable virgin females within 24 hr. Injection of gland extracts from allatectomized males produces no stimulatory effect. Gland extracts from mature males contain two antigens which cannot be detected in gland extracts from allatectomized males. However, both antigens can be detected in gland extracts from allatectomized males 3 days after treatment with juvenile hormone. Anion-exchange chromatography of mature gland extracts yielded two fractions which, when injected into virgin females, induced oviposition in 71 per cent of capable insects within 24 hr. These two fractions are immunologically identical to the two antigens which are absent from gland extracts of allatectomized males. We suggest that synthesis of the oviposition stimulant in Melanoplus is controlled by the corpus allatum. Injection of brain extract also induces oviposition in 100 per cent of capable virgin females within 24 hr. A possible role for the brain in the oviposition process is discussed.
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