Question

How is colleterial gland helpful in reproduction of periplaneta? (A)

Answer 1

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✔✔ The colleterial gland, as part of the accessory sex glands of the adult female cockroach, produces a structural protein and the phenolic tanning agent, protocatechuic acid glucoside.

✔✔ Both are needed for the formation of the egg capsule (ootheca), which contains the eggs of the species.

✔✔ The synthesis of the two compounds is under the control of the corpus allatum hormone.

✔✔ Transplanted colleterial glands are able to synthesize protein and glucoside in adult females; in adult males, however, the transplanted glands are able to synthesize only protein.

✔✔ They do not synthesize glucoside, even under the influence of additional juvenile hormone supplied to the male hosts by injection.

✔✔ Yet males produce enough juvenile hormone to promote the synthesis of protein and glucoside by colleterial gland cultured in female hosts.

✔✔ This was demonstrated by combining in parabiotic fusion adult males with decapitated adult females.

✔✔ The adult female apparently contains a factor which in the presence of juvenile hormone is a prerequisite for glucoside but not for protein synthesis.

✔✔ This factor is apparently also absent in nymphs of both sexes.

✔✔ The dependence of protein synthesis on the juvenile hormone provides a quantitative bioassay for estimating the juvenile hormone titer in all postembryonic stages of development.

✔✔ At present, glucoside synthesis can only be used as an indicator for the juvenile hormone concentration of adult females of different ages.

✔✔ The juvenile hormone presumably acts directly on the tissues of the collecterial glands.


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