Synergism between temperature and estradiol: a common pathway in turtle sex determination?
Synergism between temperature and estradiol: a common pathway in turtle sex determination?
复制标题
温度和雌二醇之间的协同作用：海龟性别决定的常见途径？
DOI：
10.1002/jez.1402600117
复制
发表时间：
1991
期刊：
影响因子：
--
通讯作者：
Crews,D
中科院分区：
文献类型：
--
作者：
Wibbels,T;Bull,JJ;Crews,D
在许多爬行动物中，孵化卵的温度决定了孵化出来的幼崽的性别。雌二醇的施用将抵消雄性繁殖温度的雄性化效应，导致雌性孵化。为了确定温度和雌激素是否具有生物学上的等效性，研究人员对红耳滑龟（Trachemys scripta）进行了两项实验。在第一个实验中，在第17阶段（温度敏感窗口的中间）将不同剂量的雌激素施用于保持在两种温度下的卵，26°C（通常产生所有雄性）和28.2°C（产生大部分雄性，但处于从雄性到雌性的过渡温度的阈值）。结果表明，雌激素和温度对性别决定具有协同作用。在第二个实验中，在胚胎发育的不同阶段给予雌激素。结果表明，雌性激素敏感期从第14期到第21期，这一时期与该物种的温度敏感期相似。这些实验的结果与温度和雌二醇在温度依赖性性别决定中的共同途径的假设是一致的。
In many reptiles, the temperature at which the eggs are incubated determines the sex of the hatchlings. Administration of estradiol will counteract the masculinizing effects of a male‐producing temperature, resulting in female hatchlings. To address whether temperature and estrogen are biologically equivalent, two experiments were conducted with the red‐eared slider turtle,Trachemys scripta. In the first experiment, varying dosages of estrogen were administered at Stage 17 (the middle of the temperature‐sensitive window) to eggs maintained at two temperatures, 26°C (which normally produces all males) and 28.2°C (which produces mostly males but lies at the threshold of the transition from male‐ to female‐producing temperatures). Results indicate that estrogen and temperature exert a synergistic effect on sex determination. In the second experiment, estrogen was administered at different stages of embryonic development. The results indicate an estrogen‐sensitive period ranging from Stage 14 through Stage 21, a period similar to the temperature‐sensitive period for this species. The results of these experiments are consistent with the hypothesis that temperature and estradiol act in a common pathway in temperature‐dependent sex determination.