Abstract
In Tenebrio molitor pupae, the integrity of the neuroendocrine system is necessary for ovarian maturation. The cephalic complex has no direct action on this phenomenon, but ensures the activation of the prothoracic glands. In vivo and in vitro, ecdysone ensures the differentiation of the transitory zone and vitellarium and the growth of the oocyte. The rate of output of hormone necessary for the continuation of differentiation is higher than the rate that causes the beginning of oocyte growth. Furthermore, ecdysone has to act on the ovary throughout its maturation. In vitro, farnesyl methyl ester has the juvenating action of juvenile hormone. When this substance is simultaneously added with ecdysone to the culture medium, it stops the response of the ovary to the stimulating action of the prothoracic hormone. There is an antagonism between the two hormones.
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