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首页> 外文期刊>Marine biology >Morphological process of vertical transmission of photosymbionts in the colonial ascidian Trididemnum miniatum Kott, 1977
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Morphological process of vertical transmission of photosymbionts in the colonial ascidian Trididemnum miniatum Kott, 1977

机译：殖民地海生小臂Tri Trididemnum miniatum Kott（1977）中光合子垂直传播的形态学过程

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摘要

In obligate symbioses between didemnid ascidians and prokaryotic algae (cyanobacteria), the larvae of the host ascidian usually possess Prochloron cells that are acquired from their mother colony. The process of vertical transmission of the photosymbionts has been histologically described in several species harboring Prochloron in the common cloacal cavity, where Prochloron cells are attached to the hairy surface of the tunic of the larvae during or just before larval spawning. Since the process has never been described in species harboring the photosymbionts in the tunic of the colony, here we describe the histologi-cal and ultrastructural process of vertical transmission in a photosymbiotic didemnid, Trididemnum miniatum. No phptosymbionts were associated with gametes of the ascidian. Prochloron cells appeared in the epithelial pouch enclosing the embryo and were then incorporated in the tunic of embryos in late embryonic stages. Although Prochloron cells in the tunic of the colony were rarely associated with the host cells, some amoeboid-shaped tunic cells containing Prochloron cells were occasionally found around the epithelial pouch. Therefore, the host cell is thought to be a vehicle transporting the photosymbionts in the tunic of the colony to the tunic of the embryos. The photosymbiont cells were directly embedded in the tunic of the larval trunk. They were not contained in the host cells, as are those in the tunic of the colony. These observations revealed that the mechanism of vertical transmission in T. miniatum is very different from that in didemnids harboring Prochloron in the common cloacal cavity of the colonies, such as Trididemnum cyclops. The mechanisms of symbiont transmission are diverse even within the genus Trididemnum.
机译：在双孢海藻和原核藻类（蓝细菌）之间的专性共生中，寄主海藻的幼虫通常拥有从其母菌落获得的原绿藻细胞。在组织结构的某些泄殖腔中，隐含了Prochloron的几个物种已在组织学上描述了光菌丝体的垂直传播过程，其中Prochloron细胞在幼虫产卵期间或刚出生时就附着在幼虫外衣的毛状表面上。由于该过程从未在该殖民地的外衣中带有光共生菌的物种中得到描述，因此在此我们描述了光合双生线虫（Trididemnum miniatum）中垂直传播的组织学和超微结构过程。没有phptosymbionts与海鞘的配子相关。前绿素细胞出现在包围胚胎的上皮囊中，然后在胚胎后期进入胚胎的外衣。尽管菌落外包装中的原花绿素细胞很少与宿主细胞结合，但是在上皮囊周围偶尔发现了一些含有原花绿素细胞的变形虫形外衣细胞。因此，宿主细胞被认为是将集落外套中的光共生体运送到胚的外套中的载体。将光共生体细胞直接嵌入幼虫躯干的外衣中。它们不包含在宿主细胞中，也没有包含在菌落外套中。这些观察结果表明，小锥虫的垂直传播机制与在菌落的普通泄殖腔中含有Prochloron的双虫类（如Trididemnumcyclops）有很大的不同。即使在Trididemnum属内，共生体传播的机制也多种多样。

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  • 来源
    《Marine biology》 |2007年第3期|p.359-367|共9页
  • 作者

    Euichi Hirose; Mamiko Hirose;

  • 作者单位

    Department of Chemistry, Biology and Marine Science, Faculty of Science, University of the Ryukyus, Nishihara, 903-0213, Japan;

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  • 正文语种 eng
  • 中图分类 环境生物学;
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