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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/33159

Title: Corals have already evolved the vertebrate-type hormone system in the sexual reproduction
Authors: Wen-Hung Twan;Hua-Fang Wu;Jiang-Shiou Hwang;Yan-Horn Lee;Ching-Fong Chang
Contributors: 國立臺灣海洋大學:海洋生物研究所
Keywords: Aromatase;Coral;Estradiol;GnRH;Mass spawning;Reproduction;Sex steroids;Testosterone
Date: 2005-04-09
Issue Date: 2012-10-31T08:20:00Z
Publisher: Fish Physiology and Biochemistry
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. Endocrine system has been proposed to play important roles in this annual phenomenon. A scleractinian coral, Euphyllia ancora has been selected as a model for the hormones and reproduction studies. We detected the presence of estradiol (E2), testosterone (T), glucuronided E2, glucuronided T, aromatase, immunoreactive (ir)GnRH in coral polyps E. ancora. Annual profiles of sex steroids, aromatase, and irGnRH have also been characterized. We found the parallel increases in irGnRH concentrations, aromatase activity and free E2 and glucuronided E2 concentrations at the time of coral mass spawning. The stimulation of mammalian (m)GnRH agonist in the increased aromatase activity and sex steroid concentrations was also observed in corals. Coral extracts (irGnRH) and mGnRH agonist had a similar dose-dependent effect on luteinizing hormone release in black porgy fish pituitary cells (in vitro). In conclusion, our data suggest that irGnRH and glucuronided E2 may play important roles in the control of reproduction and mass spawning in corals. Corals already evolved the vertebrate-type hormone system in the sexual reproduction.
Relation: 31(2-3), pp.111-115
URI: http://ntour.ntou.edu.tw/handle/987654321/33159
Appears in Collections:[海洋生物研究所] 期刊論文
[水產養殖學系] 期刊論文

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