Ultrastructure of egg activation and cortical reaction in the noble crayfish Astacus astacus

被引:26
|
作者
Niksirat, Hamid [1 ]
Kouba, Antonin [1 ]
Kozak, Pavel [1 ]
机构
[1] Univ South Bohemia Ceske Budejovice, Fac Fisheries & Protect Waters, Res Inst Fish Culture & Hydrobiol, South Bohemian Res Ctr Aquaculture & Biodivers Hy, Zatisi 728-11, Vochlany 38925, Czech Republic
关键词
Arthropod; Attachment stalk; Egg envelope; Egg cortex; Fertilization coat; Perivitelline space; CRAB CARCINUS-MAENAS; PACIFASTACUS-LENIUSCULUS; FERTILIZATION ENVELOPE; SICYONIA-INGENTIS; LOBSTER; ATTACHMENT; DECAPODA; SPERMATOZOA; DIVERSITY; CHORION;
D O I
10.1016/j.micron.2014.09.010
中图分类号
TH742 [显微镜];
学科分类号
摘要
Morphological changes in the gamete of female noble crayfish at four developmental stages were studied. Mature ovarian oocytes are enclosed by the first envelope that consists of two layers. Numerous pores are visible on the surface of the outer layer of this envelope and the inner layer contains bottlebrush-shaped objects. Three types of vesicles, including some that are highly and moderately electron-dense and some multi-layered, occur in the cortex of the oocyte. In freshly ovulated eggs, the pores in the outer layer are closed, and the bottlebrush-shaped objects in the inner layer are replaced by a spongiform electron-lucent matrix containing scattered electron-dense vesicles. One hour post-spawning, the first envelope, especially its inner layer, is condensed. The highly and moderately dense vesicles discharge their contents into the perivitelline space, where they combine and form a second envelope around the egg. Twenty-four hours post-ovulation, a second envelope is visible in the perivitelline space and the outer part of egg cortex. The highly and moderately electron-dense vesicles continue to release and combine contents to further construction of the second envelope after 24 h post-spawning. The egg attachment stalk is derived from the first envelope. The fertilization coat in the noble crayfish consists of first and second envelopes that are produced by the ovary and the cortical reaction, respectively. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:115 / 121
页数:7
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