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題 名 | 巨牡蠣Crassostrea gigas之受精及早期胚胎發育=Early Developmental Events Following Fertilization in the Oyster Crassostrea Gigas |
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作 者 | 陳紫媖; 鄭金華; 陳淳禎; 柯惠青; 蘇茂森; 廖一久; | 書刊名 | 水產研究 |
卷 期 | 4:1 1996.06[民85.06] |
頁 次 | 頁21-31 |
分類號 | 439.61 |
關鍵詞 | 受精; 胚胎發育; 頂體反應; 極體; 擔輪子幼生; D型幼生; Fertilization; Embryonic development; Acrosome reaction; Polar body; Trochophore; D-larvae; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究是利用光學顯微鏡及掃描式電子顯微鏡來觀察巨牡蠣 Crassostrea gigas 的精卵受精時之相互作用及胚胎發育的超微構造變化。巨牡蠣 的精子頭部約2 (m,前端具有帽形頂體部,後端有四個粒線體組成之環形結構, 由其中延伸長出約40 (m之鞭毛,成熟之精子釋出於海水中之活動力極強。巨 牡蠣之未受精卵大小約為50-60 (m,形狀較不規則,由橢圓形至水滴形皆存在, 此係因植物極部份之極葉凸出所致。卵之最外層由具細突起之卵黃外膜所包圍。 當精子接觸至卵膜上即進行頂體反應,並穿透卵外膜而進行受精。巨牡蠣的卵 在27℃的水溫下,受精後其減數分裂回復,於8-12分間產生第一極體,20-24 分間產生第二極體,40分後開始進行有絲分裂進入二細胞期,45分後進入四細 胞期,4小時後多細胞之胚胎外圍開始長出纖毛,8小時後植物極部份細胞開始 發生陷入作用而進入囊胚期,隨後胚胎發育為擔輪子幼生 (TrochOhore),16小 時就會變態為D型幼生 (D-larvae)。以三種不同水溫(24、27、30℃)培育巨 牡蠣之受精卵,顯示水溫會影響受精卵極體出現時間及胚胎發育。溫度愈高, 受精卵發育速度愈快,亦即第一、第二極體出現時間以及第一次有絲分裂時間 隨溫度升高而縮短。經由卵巢刮取之卵來進行受精之受精卵的減數分裂回復時 間及有絲分裂時間並不一致,此現象尤其在混合多個雌種貝進行受精時更為明 顯。本實驗之結果可提供巨牡蠣誘發三倍體時之染色體操作的依據,同時,藉 由巨牡蠣胚胎之發育過程,可提供其育種及幼苗培育之參考。 |
英文摘要 | Early development of the oyster Cressostrea gigas cultured in Taiwan was analyzed with emphasis on the processes of fertilization, sperm-egg interaction, meiotic maturation, and early embryogenesis, using light and epifluorescence microscopy and scanning electron microscopy. The oyster sperm is composed of a spherical head region with an anterior cap-like acrosome, and a posterior mitochondrial region, from which extends a 40 (m long flagellum. The unfertilized eggs are approximately 50-60 (m, with irregular shape from ellipsoid to pear shape due to the extension of polar lobe in vegetal pole. The egg is surrounded with thin, protruded vitelline envelope. When the sperm bind to the vetelline envelope they undergo acrosome reaction immediately and penetrate through the vetelline envelope to fuse with the plasma membrane of the egg. At water temperature of 27 oC, meiotic divisions of the eggs resume after fertilization. The first polar body extrudes about 8-12 minutes and the second polar body forms approximate 20-24 minutes after fertilization. The first and second division occur 40 and 45 minutes respectively after fertilization. The oyster embryos rapidly reach the morula and ciliated blastula stages and become motile gastula about 8 hours after fertilization. The embryos pass through a trochophore stage and develop into a straight-hinge D-larvae approximately 16 hours after fertilization. The effects of water temperature (24, 27, and 30 oC) on meiotic maturation and cell division were examined. The kinetics of polar body formation and the first mitotic division are influenced by rising temperature, i.e., the higher the temperature, the faster development of fertilized eggs and embryos proceed. The unsyncronized meiotic and mitotic development of the oyster occur using stripped oocytes from the female, and this phenominum is more evident when using the mixture of the oocytes from several females. The results clearly define the conditions and features for normal meiotic maturation and embryonic development of the oyster from local Taiwan and can provide a basic guideline for successful breeding, culturing and induction of polyploid of the oyster in Taiwan. |
本系統中英文摘要資訊取自各篇刊載內容。