Synchronous oogenesis during the semilunar spawning cycle of the tropical abalone Haliotis asinina
Synchronous oogenesis during the semilunar spawning cycle of the tropical abalone Haliotis asinina
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热带鲍鱼半月产卵周期的同步卵子发生
DOI：
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发表时间：
2000
影响因子：
1.3
通讯作者：
B. Degnan
中科院分区：
文献类型：
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作者：
E. Jebreen;R. Counihan;D. Fielder;B. Degnan
在大堡礁南部，海螺每两周以一种可预测的方式同步产卵。允许详细分析生殖、配子发生和性腺发育。在这个半月周期内，对苍鹭礁种群成员卵巢的组织学检查表明，卵的发生也是同步的和可预测的，并且需要两个以上的产卵周期（即100 - 28天）才能完成。在一次产卵后不久，卵巢包括两组初级卵母细胞（其中一个将在下一次产卵时释放）和一群卵原细胞。此时，小梁、生发上皮和卵原细胞迅速增殖和扩张，在下一次产卵时产生的卵黄原卵母细胞的大小急剧增加。在4天内，这些卵母细胞充满了卵巢。在下一次产卵的当天，由于小梁的局部降解，卵巢内形成腔体。大的原代卵母细胞从后退的小梁中分离出来。启动成熟，并在管腔中积累；这些卵母细胞被包裹在一层果冻外衣中。下一批卵母细胞仍然附着在小梁上。水母的外衣在产卵后30分钟内就完全溶解了。植物卵发生与卵巢发育的比较。亚洲鲍鱼与其他种类的鲍鱼表明，这些过程在热带和温带鲍鱼中非常相似。这表明，对亚洲海螺生殖和产卵调控的认识可能适用于其他海螺。
On the southern Great Barrier Reef, Haliotis asinina (Vetigastropoda: Pleurotomarioidea) synchronously spawn every 2 wk in a predictable fashion. allowing detailed analysis of reproduction, gametogenesis, and gonad development. Histological examination of the ovaries of members of the Heron Reef population during this semilunar cycle reveals that oogenesis is also synchronous and predictable, and requires more than two spawning cycles (i.e. >28 days) to complete. Shortly after a spawning event the ovary comprises two cohorts of primary oocytes, one of which will be released at the next spawning event, and clusters of oogonia. At this time there is a rapid proliferation and expansion of trabeculae, germinal epithelial, and oogonia, and a dramatic increase in the size of the vitellogenic oocytes to be: spawned at the next spawning event. Within 4 days these oocytes have filled the ovary. On the day of the next spawning a lumen forms in the ovary as a result of localized degradation of trabeculae. The large primary oocytes dissociate from the receding trabeculae. initiate maturation, and accumulate in the lumen; these oocytes become embedded in a jelly coat layer. The next cohort of oocytes remain attached to the trabeculae. The jelly coat appears to be completely dissolved within 30 min of spawning. Comparison of the oogenesis and ovary development in II. asinina with other abalone species indicates that these processes are very similar in tropical and temperate abalone. This suggests that insights into the regulation of reproduction and spawning in H. asinina are likely to be applicable to other haliotids.