Endocrine regulation of the reproductive arrest in the long-winged females of a flightless bug, Pyrrhocoris apterus (Heteroptera: Pyrrhocoridae)
| Autor: | Magdalena Hodkova, Radomír Socha |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2006 |
| Předmět: |
brachyptery
medicine.medical_specialty media_common.quotation_subject Stimulation Diapause allatectomy nervi-allati transection Internal medicine medicine terminal oocyte Brachyptery media_common biology Pyrrhocoridae Heteroptera Pyrrhocoris biology.organism_classification corpus allatum Endocrinology QL1-991 Insect Science macroptery pyrrhocoris apterus Corpus allatum Reproduction oviposition Zoology |
| Zdroj: | European Journal of Entomology, Vol 103, Iss 3, Pp 523-529 (2006) |
| ISSN: | 1802-8829 1210-5759 |
| Popis: | Mechanisms of the suppression of gonadotropic activity of the corpus allatum (CA) in macropterous females were com- pared with those previously reported for either diapause or starving non-diapause brachypterous females by reciprocal transplanta- tions of the neuroendocrine complexes (comprising the brain-suboesophageal ganglion-corpora cardiaca-CA). The denervated CA stimulated reproduction in most females of all experimental groups suggesting an inhibition of the CA via nervous connections with the brain. The inhibition of the CA within the transplanted neuroendocrine complex was measured by the reproductive performance of feeding recipient females deprived of their own CA. The complex from starving non-diapause brachypterous females stimulated reproduction in 58.3-78.9% of recipients suggesting that the inhibition of the CA was mostly overcome by the stimulating internal milieu of feeding females. In contrast, the "macropterous" complex stimulated reproduction in only 18.8-37.5% of recipients, similar to the "diapause brachypterous" complex (32.0%). The results indicate that the "macropterism", similar to the diapause, is associated with a considerably lower responsiveness of the neuroendocrine complex to humoral stimulation by feeding compared to the responsivenes of the "starving" complex from brachypterous non-diapause females. On the other hand, the CA of macropterous females is of intermediate size between that of the feeding non-diapause and diapause brachypterous females, similar to the CA of the non-diapause brachypterous females deprived of food. Overall, the data suggest that the suppression of the CA activity results from a combination of the diapause-like refractoriness of the neuroendocrine complex with the starvation-like inhibition of the CA growth. Regulation of the CA activity is discussed in relation to the "oogenesis-flight syndrome" recorded for flying wing- polymorphic species of insects. |
| Databáze: | OpenAIRE |
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