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Interaction of specific temporal phase relations of circadian neural oscillations and long term photoperiodic responses in Japanese quail, Coturnix coturnix japonica.
Gen Comp Endocrinol. 2015 Jun-Jul; 217-218:54-61.GC

Abstract

Specific temporal phase relations of neural oscillations are reported to regulate gonadal activity in many avian species but their interaction with photo-sexual response are still unclear. Hence in the present study, 3week old Japanese quail maintained in short days (experiment 1) received normal saline (SD control) or serotonin precursor 5-HTP and dopamine precursor l-DOPA injections at the interval of 12h (SD 12-h) for 13days. At 37week of age, one subgroup of SD 12-h received these drugs at the interval of 8-h (SD 12-h+8-h). In the second experiment, 3week old quail were injected with 5-HTP and l-DOPA 8h apart (LD 8-h) and then maintained under long days. At the age of 37weeks, one subgroup of these LD quail was retreated with 5-HTP and l-DOPA at the interval of 8h (LD 8-h+8-h). Cloacal gland volume was monitored weekly up to 45weeks of age in both experiments and other reproductive parameters were monitored at 23 and 45week of age. These results indicate that 12-h phase relation of neurotransmitter precursors not only initiates early onset of scotorefractoriness i.e., full development of gonad even under short-day length but maintains it continuously (a long lasting effect) unlike control and the 8-h relation dissipates it, making the quail scotosensitive. On the other hand, the 8-h phase relation suppresses the gonado-stimulatory effect of long days but this effect is transitory. Thus the 12-h phase relation is gonado-stimulatory under short day conditions and the 8-h relation is gonado-inhibitory even under long days, inducing scotorefractoriness and photorefractoriness, respectively, it is suggested that effects of specific temporal phase relation of circadian neural oscillations similar to photoperiodic effects, are not only mediated by HPG axis but may also modulate the classical photoperiodic responses of Japanese quail.

Authors+Show Affiliations

Department of Zoology, Banaras Hindu University, Varanasi 221 005, India. Electronic address: suneeta17bhu@gmail.com.Department of Zoology, Banaras Hindu University, Varanasi 221 005, India. Electronic address: cmcbhu@gmail.com.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

25801549

Citation

Yadav, Suneeta, and Chandra Mohini Chaturvedi. "Interaction of Specific Temporal Phase Relations of Circadian Neural Oscillations and Long Term Photoperiodic Responses in Japanese Quail, Coturnix Coturnix Japonica." General and Comparative Endocrinology, vol. 217-218, 2015, pp. 54-61.
Yadav S, Chaturvedi CM. Interaction of specific temporal phase relations of circadian neural oscillations and long term photoperiodic responses in Japanese quail, Coturnix coturnix japonica. Gen Comp Endocrinol. 2015;217-218:54-61.
Yadav, S., & Chaturvedi, C. M. (2015). Interaction of specific temporal phase relations of circadian neural oscillations and long term photoperiodic responses in Japanese quail, Coturnix coturnix japonica. General and Comparative Endocrinology, 217-218, 54-61. https://doi.org/10.1016/j.ygcen.2015.03.006
Yadav S, Chaturvedi CM. Interaction of Specific Temporal Phase Relations of Circadian Neural Oscillations and Long Term Photoperiodic Responses in Japanese Quail, Coturnix Coturnix Japonica. Gen Comp Endocrinol. 2015 Jun-Jul;217-218:54-61. PubMed PMID: 25801549.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Interaction of specific temporal phase relations of circadian neural oscillations and long term photoperiodic responses in Japanese quail, Coturnix coturnix japonica. AU - Yadav,Suneeta, AU - Chaturvedi,Chandra Mohini, Y1 - 2015/03/20/ PY - 2014/12/12/received PY - 2015/03/10/revised PY - 2015/03/15/accepted PY - 2015/3/25/entrez PY - 2015/3/25/pubmed PY - 2015/11/4/medline KW - 5-HTP KW - Japanese quail KW - Long daylength KW - Scotorefractoriness KW - Scotosensitivity KW - l-DOPA SP - 54 EP - 61 JF - General and comparative endocrinology JO - Gen Comp Endocrinol VL - 217-218 N2 - Specific temporal phase relations of neural oscillations are reported to regulate gonadal activity in many avian species but their interaction with photo-sexual response are still unclear. Hence in the present study, 3week old Japanese quail maintained in short days (experiment 1) received normal saline (SD control) or serotonin precursor 5-HTP and dopamine precursor l-DOPA injections at the interval of 12h (SD 12-h) for 13days. At 37week of age, one subgroup of SD 12-h received these drugs at the interval of 8-h (SD 12-h+8-h). In the second experiment, 3week old quail were injected with 5-HTP and l-DOPA 8h apart (LD 8-h) and then maintained under long days. At the age of 37weeks, one subgroup of these LD quail was retreated with 5-HTP and l-DOPA at the interval of 8h (LD 8-h+8-h). Cloacal gland volume was monitored weekly up to 45weeks of age in both experiments and other reproductive parameters were monitored at 23 and 45week of age. These results indicate that 12-h phase relation of neurotransmitter precursors not only initiates early onset of scotorefractoriness i.e., full development of gonad even under short-day length but maintains it continuously (a long lasting effect) unlike control and the 8-h relation dissipates it, making the quail scotosensitive. On the other hand, the 8-h phase relation suppresses the gonado-stimulatory effect of long days but this effect is transitory. Thus the 12-h phase relation is gonado-stimulatory under short day conditions and the 8-h relation is gonado-inhibitory even under long days, inducing scotorefractoriness and photorefractoriness, respectively, it is suggested that effects of specific temporal phase relation of circadian neural oscillations similar to photoperiodic effects, are not only mediated by HPG axis but may also modulate the classical photoperiodic responses of Japanese quail. SN - 1095-6840 UR - https://www.unboundmedicine.com/medline/citation/25801549/Interaction_of_specific_temporal_phase_relations_of_circadian_neural_oscillations_and_long_term_photoperiodic_responses_in_Japanese_quail_Coturnix_coturnix_japonica_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0016-6480(15)00084-2 DB - PRIME DP - Unbound Medicine ER -