Advances in Insect Physiology, Vol. 19 by P. D. Evans, V. B. Wigglesworth

By P. D. Evans, V. B. Wigglesworth

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9 CONCLUDING REMARKS The idea that emerges from a number of often conflicting results concerning the regulation of spermatogenesis is that ecdysteroids plays a major role in this process, as it does in the first reproductive stages of the female. The testis itself, however, seems able to assume its own regulation, perhaps by producing ecdysone as occurs in the ovary. This implies that regulation by the brain is highly probable, and also that the role of the moulting gland might not be essential.

1982). A higher ecdysteroids titre might thus be necessary for apyrene differentiation. However, it might also be that both types of spermatogenesis, as well as the female trophoytes and I N S E C T R E PRO D U CTI 0 N 45 oocytes, are determined at a much earlier stage. Data on this point seem to be lacking. In the moth Anagasta kuehniella, ecdysterone injection before the initiation of sperm release from the testes prevented the release of eupyrene sperm bundles while apyrene release remained normal.

In the last instar larvae, in which JH is present in very small amounts, or totally absent. Indeed, extirpation of the corpora allata early in the 3rd instar allowed the insect to reach the 5th stage, and the initiation of spermatogenesis could be observed (Takeuchi, 1969). In Periplaneta americana, the removal of endocrine glands, testis transplantation and hormone injection showed that ecdysterone accelerated testis development but J H inhibited it (Blaine and Dixon, 1976). The inhibiting effect of corpora allata implantation and JH/JHA treatment upon testis development was shown in several species, including Locusta rnigratoria (Cantacuzkne and Seureau, 1970), Corcyra cephalonica (Deb and Chakravorty, 1981) and Spodoptera (Gelbic and Metwally, 1981).

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