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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/38310

Title: Corals already have 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:水產養殖學系
Keywords: Testosterone
Mass spawning
Sex steroids
Date: 2005
Issue Date: 2016-08-24T08:21:17Z
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)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/38310
Appears in Collections:[水產養殖學系] 期刊論文

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