Abstract
Maternal exposure to short daylength during embryonic and larval life prevents the expression of pupal diapause in the female's progeny. Transplantation of ovaries between long-day history and short-day history larvae does not alter the diapause fate of the progeny, thus implying that information eliciting the maternal effect is still retained within the brain at the end of larval life. Sometime between the end of larval life and the third day of adult life the information regulating the maternal effect is transferred to the ovary. Transection of the nerve innervating the reproductive organs does not alter expression of the maternal effect. Haemolymph from days 1–2, long-day-history adults caused some short-day-history females to produce diapausing progeny, and central nervous system extracts from long-day-history larvae likewise promoted diapause in the progeny of short-day-history larvae. Thus, a diapause-promoting factor from the central nervous system of the mother may be a prerequisite for the expression of diapause in her progeny. None of the known insect hormonal agents, including 20-hydroxy-ecdysone, a juvenile hormone analogue or oestrogens, and androgens can mimic this effect.
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