Long Day Photoperiods and Temperature of 20°C Induce Spermatogenesis in Blinded and Non-blinded Marbled Newts during the Period of Testicular Quiescence1
| العنوان: | Long Day Photoperiods and Temperature of 20°C Induce Spermatogenesis in Blinded and Non-blinded Marbled Newts during the Period of Testicular Quiescence1 |
|---|---|
| المؤلفون: | Ricardo Paniagua, Marina C. Rodríguez, Benito Fraile |
| المصدر: | Biology of Reproduction. 39:649-655 |
| بيانات النشر: | Oxford University Press (OUP), 1988. |
| سنة النشر: | 1988 |
| مصطلحات موضوعية: | photoperiodism, endocrine system, biology, urogenital system, Period (gene), Zoology, Triturus marmoratus, Cell Biology, General Medicine, Testicle, biology.organism_classification, Andrology, medicine.anatomical_structure, Reproductive Medicine, Darkness, medicine, Spermatogenesis, reproductive and urinary physiology, Germ cell, Caudata |
| الوصف: | Adult male marbled newts (Triturus marmoratus) were collected at the end of the spermatogenesis period and exposed to different photoperiods (natural-daylength-simulated photoperiod, total darkness, 8L:16D, 12L:12D, 16L:8D, and continuous light) for 3 mo. Temperature was maintained at 20 degrees C. Two additional groups of newts were blinded and exposed to either the natural-simulated photoperiod and to 16 h of light per day respectively. Quantitative histologic studies on testicular development and germ cell volume per testis were performed. The newts captured in the field at the beginning (initial controls) or at the end of the experiments (final controls) were in the period of testicular quiescence. Newts kept in total darkness or exposed to a short photoperiod (8L:16D) showed germ cell development up to primary spermatocytes, whereas germ cell development in the newts exposed to long photoperiods (12L:12D or 16L:8D) progressed to elongated spermatids. The newts exposed either to intermediate photoperiods (natural-simulated photoperiod) or to constant light showed an intermediate degree of germ cell development (up to round spermatids). No significant differences between non-blinded and blinded animals were found. These results suggest that (1) mild temperature initiates testicular development in the period of testicular quiescence, (2) long photoperiods associated with mild temperatures produce spermatogenesis in this period, (3) complete darkness or constant light are less effective than some intermediate photoperiod, and (4) the effect of photoperiod on testicular function in newts is not related to ocular photoreception. |
| تدمد: | 1529-7268 0006-3363 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_________::518a46890db19de4b1f9d1873687381eTest https://doi.org/10.1095/biolreprod39.3.649Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi...........518a46890db19de4b1f9d1873687381e |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15297268 00063363 |
|---|