Abstract
The adults of Bombyx mori emerge synchronously at definite intervals. The present investigation was performed to elucidate the effects of photo-conditions during the pupal stage on the rhythm formation of emergence and its relationship with the cerebral neuro-secretion. The results were as follows;1) Insertion of light period (15 min to 22 hr) or dark period (30 min to 16 hr) to continuous darkness or light condition during the pharate adult stage resulted in particular formation of rhythms.2) When the pupae were kept under condition of 8L-22D or 4L-8D, peaks of emergence were formed after 9-10 hr of light off and after 1 hr of light on. And, time of adult emergence was controled expectedly under photoperiodic conditions.3) Adults just after emergence were found to contain neurosecretory granules in the axons of median neurosecretory cells but pharate adults were not. From this observation, it may be presumed that the neuro-secretory material is a trigger of the eclosion behaviour.
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