Abstract
Luminescences in response to electrical stimulation and pharmacological treatment were characterized during progressive degeneration of the larval light organ and differentiation of the adult light organ during metamorphosis. It was found that: (1) neural control of the larval light organ persists during pupation, (2) the differentiating adult light organ, while frequently luminescing, is not directly or neurally excitable until eclosion (3), a gradual loss of postsynaptic receptor chemical responsiveness occurs in parallel with declining neural excitability of the larval light organ, (4) postsynaptic chemical sensitivity of the adult light organ appears prior to establishment of neural control, (5) both larval and adult light organs spontaneously luminesce in the absence of neural control, and (6) synapses between nerve terminals and photocytes of the larval light organ are present throughout pupation.
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