...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine biology >Two enigmas may solve each other: the oocyte coat and atresia in the common cockle, Cerastoderma edule (Linnaeus, 1758)
【24h】

Two enigmas may solve each other: the oocyte coat and atresia in the common cockle, Cerastoderma edule (Linnaeus, 1758)

机译：两个谜可以互相解决：卵母细胞外套和atresia在普通的毛耳，Cerastoderma Edule（Linnaeus，1758）

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Two co-occurring, enigmatic aspects of bivalve reproduction were investigated in the common cockleCerastoderma edule: the oocyte coat and oocyte atresia. Qualitative histology and transmission electron microscopy (TEM) of cockles collected on the French Atlantic coast revealed not only the fine structure of the oocyte coat, but also confirmed that it is secreted by the oocyte itself and composed of acid mucopolysaccharides (AMPS), known to be viscous and adhesive. Quantitative histology showed that at the peak of oogenesis, oocyte coats occupy the largest fraction (approx. 40%) of the gonad acinal volume, representing both a significant sacrifice of female gamete capacity, and a non-gamete energetic investment. Potential benefits of the coat include protection from mechanical abrasion, predation, and opportunistic microbes. Atresia (oocyte degeneration) was a known second source of reduced fecundity, with a minimum impact of approximately 50% of the total oocyte volume. It is suggested that this high proportion of atresic oocytes is related to the previously-documented genetic inviability of early post-fertilization life stages. The qualitative histological and TEM observations revealed atresic debris adhering to the exterior surface of the oocyte coats. Such an arrangement would isolate adjacent oocyte coats, enabling the oocytes to be spawned individually, rather than as an egg mass, and therefore to undergo planktonic development and dispersion. Oocyte atresia and the oocyte coat ofCerastoderma eduletherefore appear to be linked in the first indication of an adaptive function in bivalves.
机译：在普通的Cocklecerastoderma Edule中研究了两种共同发生的分枝繁殖的神秘方面：卵母细胞涂层和卵母细胞宿舍。在法国大西洋海岸收集的定性组织学和透射电子显微镜（TEM）的Cockles不仅揭示了卵母细胞涂层的细结构，还证实它是由卵母细胞本身分泌并由已知的酸粘多糖（AMP）分泌是粘性和粘合剂。定量组织学表明，在OE发生的峰值，卵母涂层占据了Gonad宏体积的最大级分（约40％），代表了女性配子能力的显着牺牲，以及非配子充满活力的投资。涂层的潜在益处包括防止机械磨损，捕食和机会性微生物。 Atresia（卵母细胞变性）是已知的繁殖力的第二源，最小卵母细胞体积的约50％的影响。建议这种高比例的萎缩卵母细胞与早期受精后寿命的先前记录的遗传验收性有关。定性组织学和TEM观察揭示了粘附在卵母涂层的外表面上的紫外线碎屑。这种布置将分离相邻的卵母细胞涂层，使得能够单独地产生卵母细胞，而不是作为蛋质量产生，并且因此经历浮鳞的发育和分散。卵母细胞atresia和卵母涂层eDulemeterforforforforforforeGethere似乎在双抗体中的适应性功能的第一次指示中似乎链接。

著录项

  • 来源
    《Marine biology》 |2020年第7期|104.1-104.11|共11页
  • 作者

    Cherel Daphne; Beninger Peter G.; Le Pennec Gael;

  • 作者单位

    Univ Nantes Fac Sci Lab Biol Marine 2 Rue Houssiniere F-44322 Nantes France;

    Univ Nantes Fac Sci Lab Biol Marine 2 Rue Houssiniere F-44322 Nantes France;

    Univ Bretagne Sud Lab Biotechnol & Chim Marines Rue St Maude F-56321 Lorient France;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号