수산해양교육연구 (Journal of Fisheries and Marine Sciences Education)

  • 제27권4호
  • /
  • Pages.1031-1040
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  • 2015
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  • 1229-8999(pISSN)
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  • 2288-2049(eISSN)
한국수산해양교육학회 (The Korean Society for Fisheries and Marine Sciences Education)
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한국 섬진강 기수역 암컷 피뿔고둥 Rapana venosa (복족류 : 뿔소라과)의 생식세포 발달에 따른 난황형성과정의 미세구조적 연구 및 교미 시기와 산란 활성

Ultrastructural Studies of Vitellogenesis According to Germ Cell Development, and Mating Period and Spawning Activity in Female Rapa Whelk, Rapana venosa (Gastropoda: Muricidae) in the Brackish Water Area of Seomjin River, Korea

  • 투고 : 2015.06.08
  • 심사 : 2015.07.13
  • 발행 : 2015.08.31
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초록

섬진강 기수역에 서식하는 피뿔고둥, R. venosa(Muricidae)의 생식세포분화와 난모세포 내에서의 난형성과정 중 난황형성의 미세구조적 연구를 위해 투과전자현미경 관찰로 조사하였다. 초기난황형성난모세포들에서 골지체와 미토콘드리아는 글리코겐 입자들, 지방적들과 난황과립들의 형성에 관여하였다. 후기난황형성난모세포들에서 조면소포체와 다포체들은 세포질 내에서 단백질성 난황과립들의 형성에 관여하였다. 여러 크기의 다포체들은 후기난황형성 난모세포 내에서 변형된 미토콘드리아들에 의해 형성되었다. 특히, 다른 복족류들의 결과들과 이매패류에서 일어나는 현상을 비교하여 보면, 이매패류의 경우에는 난황형성의 타가합성과 관련된 것으로, 난황막 위에 미세융모(microvilli)와 피질층에 피질과립들이 출현하고 있는데, 복족류의 경우는 난황형성난모세포내에서 난황형성 중 난모세포 밖으로부터 외생적으로 일어나지 않아 출현하지 않는 점이 이매패류나 두족류와 다른 점이다. 성숙란 내의 성숙난황과립은 3가지 성분으로 이루어져 있다 : (1) 난황과립의 중앙부에 결정중심이 있고, (2) 주변부에는 전자밀도가 밝은 피질층이 있고, 그리고 이들을 (3) 한계막이 둘러싸고 있다. 최종적으로 복족류 종들의 난모세포들 내에서의 난황형성과정은 타가합성과정(외생적 endocytosis)이 발견되지 않고 단지 난모세포 자체의 내생적 자율합성과정을 거쳐 일어나는 특징을 보였다. 피뿔고둥은 난황형성을 위해 난황형성과정 중, 염분농도가 높고 낮음으로 인해 내생적 자율합성과 외생적 타가합성이 변경된 현상은 발견되지 않았다. 교미시기와 산란 활성은 수온 및 염분농도 상승과 관련이 있다.

Ultrstructural studies of germ cell differentiation and vitellogenesis in the oocytes of the female Rapana venosa in the brackish water area of Seomjin River were investigated by transmission electron microscope observations. In the early vitellogenic oocytes, the Golgi complex and mitochondria were involved in the formation of glycogen particle, lipid droplets, and yolk granules. In the late vitellogenic oocytes, the rough endoplasmic reticulum and multivesicular bodies were involved in the formation of proteid yolk granules in the cytoplasm. However, heterosynthetic vitellogenesis in this species were not observed in vitellogenic oocytes during oogenesis. A mature yolk granule was composed of three components: crystalline core, electron lucent cortex and the limiting membrane. As shown in some large gastropods, vitellogenesis in R. venosa occurred by way of endogenous autosynthesis without heterosythetic vitellogenesis (exogeneous endocytosis), which are found in the oocytes in bivalves. The mating period and spawning activity were related with the increases of seawater temperatures and salinities.

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