黄鳝血清褪黑激素水平日周期性与季节性变化的节律  

DIEL AND SEASONAL RHYTHMS OF SERUM MELATONIN LEVEL IN MONOPTERUS ALBUS

作　　者：石琼[1] 林浩然[1] 邓柏礼[2] 

机构地区：[1]中山大学生命科学学院 [2]香港理工大学应用生物及化学科技学系

出　　处：《上海水产大学学报》1999年第1期37-42,共6页Journal of Shanghai Fisheries University

基　　金：香港理工大学合作课题!HKPU 340/845资助

摘　　要：通过放射免疫测定方法，本文初步研究了黄鳝血清褪黑激素的分泌特性。实验结果表明，黄鳝血清褪黑激素水平具有明显的日周期性与季节性变化节律。白天血清中褪黑激素水平较低，夜间浓度显著升高，比白天值高1～2倍。随着性腺的发育，从卵巢Ⅱ至Ⅳ期，血清中褪黑激素含量逐渐升高，到排卵前期则急剧下降，排卵期达到雌性阶段的最低值；排卵后期，血清褪黑激素水平又逐渐回升：间性期则有下降的趋势：雄鱼血清中褪黑激素水平极低。褪黑激素水平的季节性变化结果显示，内源性褪黑激素可能参与黄鳝的性转变进程。With a radioimmunoassay for melatonin, the secretional characteristics of serum melatonin in the ricefield eel, Monopterus albus Zuiew were studied. The results show that serum melatonin levels in the ricefield eels demonstrated a clear daily cycle and changed seasona1ly. The diel rhythm was characterized by a rapid increase almost immediately (0. 5- 1 hour)after the onset of darkness,maintaince of high levels for the duration of the night,and a rapid decline to basal levels (about 1/2- 1/3 of the nighttime amplitude)at the time of light onset. Dramatic seasonal variation in amplitude of the nocturnal increase was found in the serum too. The serum melatonin levels of female ricefield eels increased significantly accompanied with ovarian development,and reached its highest level at the fourth stage of ovarian maturation, but then decreased rapidly at the prespawning stage. After spawning, serum melatonin levels elevated again. During sex-reversal process, serum melatonin levels decrease gradually, and the lowest values were recorded in the mature males. The seasonal rhythm suggests that endogenous melatonin appears to be involved in the process of sex reversal in the ricefield eel.

关 键 词：黄鳝 血清褪黑激素 节律 周期性 季节性 

分 类 号：Q959.482[生物学—动物学]