English  |  正體中文  |  简体中文  |  Items with full text/Total items : 28611/40649
Visitors : 628031      Online Users : 60
RC Version 4.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Adv. Search
LoginUploadHelpAboutAdminister

Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/38312

Title: Homones and reproduction in scleractinian corals
Authors: Wen-Hung Twan
Jiang-Shiou Hwang
Yan-Horn Lee
Hua-Fang Wu
Ying-Hsiu Tung
Ching-Fong Chang
Contributors: 國立臺灣海洋大學:水產養殖學系
Keywords: Testosterone
Coral
Aromatase
Estradiol
GnRH
Mass spawning
Reproduction
Sex steroids
Date: 2006
Issue Date: 2016-08-25T01:30:23Z
Publisher: Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology
Abstract: Abstract: Most broadcast spawning scleractinian corals synchronously release gametes during a brief annual spawning period. In southern Taiwan, the mass spawning of scleractinians occurs in lunar mid-March. The exact cues triggering this annual phenomenon remain unclear. A scleractinian coral, Euphyllia ancora has been selected as a model for the hormones and reproduction studies. Testosterone (T) and estradiol (E2) in free and glucuronided forms were identified and consistently detected in coral polyps throughout the year. Peak levels of free E2, glucuronided E2 and T were obtained in the coral tissue just prior to spawning. The presence of specific aromatase activity was demonstrated in coral tissue. Higher concentrations of free E2 than glucuronided E2 were detected in the coral tissue throughout the year. In contrast, higher levels of glucuronided E2 than free E2 and glucuronided T were found in seawater during mass coral spawning. Furthermore, immunoreactivity and biological activity of immunoreactive gonadotropin-releasing hormone (irGnRH) was detected and quantified in coral tissue. Coral extracts (irGnRH) and mammalian (m)GnRH agonist had a similar dose-dependent effect on luteinizing hormone (LH) release in black porgy fish pituitary cells (in vitro). Peak levels of irGnRH were detected during the spawning period. In in vivo experiments, mGnRH agonist time- and dose-dependently stimulated aromatase activity, as well as the levels of T and E2 in free and glucuronided forms in coral. In conclusion, our data suggest that irGnRH and glucuronided E2 may play important roles in the control of reproduction and mass spawning in corals.
Relation: 144(3)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/38312
Appears in Collections:[水產養殖學系] 期刊論文

Files in This Item:

File Description SizeFormat
index.html0KbHTML99View/Open


All items in NTOUR are protected by copyright, with all rights reserved.

 


著作權政策宣告: 本網站之內容為國立臺灣海洋大學所收錄之機構典藏,無償提供學術研究與公眾教育等公益性使用,請合理使用本網站之內容,以尊重著作權人之權益。
網站維護: 海大圖資處 圖書系統組
DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback