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首页> 外文期刊>Zoological Science >Vertical Transmission of Photosymbionts in the Colonial Ascidian Didemnum molle: The Larval Tunic Prevents Symbionts from Attaching to the Anterior Part of Larvae
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Vertical Transmission of Photosymbionts in the Colonial Ascidian Didemnum molle: The Larval Tunic Prevents Symbionts from Attaching to the Anterior Part of Larvae

机译：立式传播的光生菌在殖民地海鞘Didemnum molle：幼虫外套防止共生菌附着到幼虫的前部。

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摘要

Morphological processes in the vertical transmission of photosymbionts were investigated in the Prochloron-bearing ascidian Didemnum molle. Prochloron cells were found exclusively in the common cloacal cavity of the colony, attached mainly to the tunic lining of the cavity wall. Oocytes were found in the abdominal region of each zooid, but no Prochloron cells were associated with this stage. During embryogenesis, embryos moved into the tunic core of the colony and were always separated from Prochloron cells in the cloacal cavity by the tunic matrix, until they hatched out from the tunic core. In swimming larvae, Prochloron cells covered the surface of the posterior half of the larval trunk, whereas a thin larval tunic layer covered the anterior half, where no Prochloron cells were found. The tunic of the posterior half of the larval trunk had many folds that enfolded the Prochloron cells and may be adhesive in order to acquire Prochloron cells from the mother colony. The thin larval tunic layer is probably not adhesive and protects the anterior half of the trunk from interference by Prochloron cells with sensory receptors and adhesive organs.
机译：在含Prochloron的海生Didemnum molle中研究了光合子在垂直传播中的形态学过程。前绿素细胞仅在菌落的普通泄殖腔中发现，主要附着在腔壁的外衣层上。在每个动物群的腹部都发现了卵母细胞，但没有Prochloron细胞与这一阶段有关。在胚胎发生过程中，胚胎移入菌落的束缚核心，并始终通过束缚基质与泄殖腔中的前绿素细胞分离，直到它们从束缚核心中孵化出来。在游泳幼虫中，Prochloron细胞覆盖了幼虫躯干后半部的表面，而幼虫上衣薄层覆盖了前半部，其中未发现Prochloron细胞。幼虫躯干后半部的被膜具有许多褶皱，包裹了原绿藻细胞，并且可能具有粘性，以便从母菌落中获得原绿藻细胞。幼虫外衣薄层可能不具有粘附性，可以保护躯干的前半部不受Prochloron细胞对感觉受体和粘附器官的干扰。

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