The photoperiodic control of reproduction inCoturnix quail. The temporal pattern of LH Secretion
The photoperiodic control of reproduction inCoturnix quail. The temporal pattern of LH Secretion
复制标题
鹌鹑繁殖的光周期控制。
DOI：
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发表时间：
1974
期刊：
影响因子：
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通讯作者：
B. Follett
中科院分区：
文献类型：
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作者：
T. Nicholls;B. Follett
鹌鹑体内LH的分泌是一种受光周期控制的反应。确定分泌的时间模式是为了获得有关这种激素分泌可能的节律性的信息。在短光周期（8L∶16D）下性腺退化的性成熟鸟血浆LH水平较低，单次长光周期（20L∶4D）后血浆LH水平明显升高。促性腺激素的分泌发生在光周期后期，大约在“黎明”后的18-19小时，并在黑暗期间保持高水平；在第二个长光周期内，血浆水平在最初几个小时内下降，但随后分泌模式在与第1天相似的时间内复发（图2、4）。当白昼长度为14L∶10D时，在这些条件下，黄体生成素的分泌仍然延迟到黎明后约18小时，发生在黑暗时期（图3）。如果黄体生成素分泌是由光与光致性节律的“敏感”相重合时启动的过程引起的，那么这种重合与垂体反应之间似乎有几个小时的延迟。
SummarySecretion of LH in quail is a photoperiodically-controlled response. The temporal pattern of secretion was determined in an attempt to gain information on the possible rhythmic nature of secretion of this hormone. Sexually mature birds undergoing gonadal regression in response to short photoperiods (8L∶16D) had low plasma levels of LH but showed markedly increased titres after restimulation with a single long photoperiod (20L∶4D). Secretion of the gonadotrophin occurred late in the photoperiod some 18–19 hr from “dawn” and persisted at a high level during the period of darkness; during a second long photoperiod plasma levels decreased in the first few hours but then the pattern of secretion recurred at a similar time to that in day 1 (Figs. 2, 4). When regressing birds were restimulated with daylengths of 14L∶10D, LH secretion was still delayed until some 18 hr from dawn, occurring under these conditions during the dark period (Fig. 3). If LH secretion results from processes initiated during coincidence of light with a “sensitive” phase of a rhythm of photoinducibility, it would appear that there is a delay of several hours between such coincidence and pituitary response.