Induction of sexual reproduction in Opalina sudafricana by injecting its host Bufo regularis with gibberellic acid |
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| Authors: | M M el-Mofty |
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| Affiliation: | Zoology Department, Faculty of Science, Alexandria University, Alexandria, Egypt |
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| Abstract: | Induction of sexual reproduction in Opalina sudafricana by injecting its host Bufo regularis with gibberellic acid. International Journal for Parasitology4, 203–206. Opalina sudafricana parasitic in the rectum of Bufo regularis was induced to reproduce sexually when its host was injected subcutaneously with 0·3 mg of gibberellin-A3. This plant growth substance had no effect on the induction of encystation in the parasites in vitro. Urine of toads injected with gibberellin-A3 induced sexual reproduction (encystation) in the opalinids in vitro. It is speculated that the plant hormone must either be broken down into an active substance by the toad or cause the toad to excrete its own gonadal hormones (or other hormones) into the urine. This active substance or the excreted hormones may induce division in the parasites resulting in the formation of small forms which encyst. |
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| Keywords: | gibberellic acid ecdysone ecdysterone gonadal hormones sexual reproduction encystation carcinogenesis bladder carcinogens |
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