Activity of the corpora allata of adult female Leucophaea maderae Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/w37639044

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  • In the cockroach Leucophaea maderae, a centre in the brain controls the female's acceptance of courting males. This centre is affected by starvation. A brief exposure to food can induce mating but is inadequate for oocyte development. In fed L. maderae there appears to be a synergistic action of nutrition and mating in controlling the rate of oocyte development. Mating (mechanical) and feeding (chemical) stimuli are both required for activating the corpora allata (CA) to their fullest extent so that the oocytes mature at their maximum rate. A rate of 0.4 mm/day of oocyte growth was recorded. Activity of CA in vitro was quantified using a radiochemical assay. In starved virgin females, no detectable activity was recorded by our assay conditions. The CA were virtually inactive and yolk was not deposited in the oocytes; mating had no effect on CA and oocyte development in starved females. Experiments with fed females showed that feeding increased CA activity to about 2 pmol JH-III/pair/hr of glands until the roaches were mated (11-12 days after eclosion). After mating, the activity of the CA increased over a period of 9 days to a peak of 52.7± 1.5 pmol JH-III/hr/pair of glands. Farnesol stimulation experiments showed that the inhibition of juvenile hormone synthesis in virgin females was exerted early in the biosynthetic pathway.
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